Kubota WSM BX23S Instruction manual

BX23S,LA340,BT603,
RCK54D,RCK60D,
RCK54,RCK60B
WORKSHOP MANUAL
TRACTOR,FRONT LOADER,
BACKHOE,ROTARY MOWER
KiSC issued 03, 2017 A

TO THE READER
This Workshop Manual tells the servicing personnel about the mechanism, servicing and maintenance of BX23S. It
contains 4 parts: "Information", "General", "Mechanism", and "Servicing".
Information
This section primarily contains information below.
• Safety first
• Safety decal
• Specifications
• Dimensions
General
This section primarily contains information below.
• Engine identification
• Model identification
•General precautions
• Maintenance check list
• Check and maintenance
• Special tools
Mechanism
This section contains information on the structure and the function of the unit. Before you continue with the
subsequent sections, make sure that you read this section.
Servicing
This section primarily contains information below.
• Troubleshooting
• Servicing specifications
• Tightening torques
• Checking, disassembling and servicing
All illustrations, photographs and specifications contained in this manual are of the newest information available at the
time of publication.
Kubota reserves the right to change all information at any time without notice.
Since this manual includes many models, information or illustrations and photographs can show more than one
model.
March, 2017
© KUBOTA Corporation
KiSC issued 03, 2017 A
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CONTENTS
1. INFORMATION
SAFETY FIRST..................................................................................................................................................1-1
1. Safety first.................................................................................................................................................1-1
2. Before you start service............................................................................................................................1-2
3. Start safely................................................................................................................................................1-2
4. Operate safely ..........................................................................................................................................1-2
5. Protect against high pressure spray .........................................................................................................1-3
6. Avoid hot exhaust .....................................................................................................................................1-3
7. Exhaust filter cleaning ..............................................................................................................................1-3
8. Prevent a fire ............................................................................................................................................1-4
9. Keep a good airflow in the work area .......................................................................................................1-4
10. Discard fluids correctly ...........................................................................................................................1-4
11. Prevent acid burns ..................................................................................................................................1-4
12. Prepare for emergencies ........................................................................................................................1-5
SAFETY LABEL.................................................................................................................................................1-7
1. Safety labels for BX tractor.......................................................................................................................1-7
2. Safety labels for mower ..........................................................................................................................1-12
3. Safety labels for loader...........................................................................................................................1-13
4. Safety labels for backhoe .......................................................................................................................1-15
SPECIFICATIONS ...........................................................................................................................................1-17
1. BX tractor specifications .........................................................................................................................1-17
2. Mower specifications ..............................................................................................................................1-19
3. Loader specifications..............................................................................................................................1-20
3.1 Loader specifications ......................................................................................................................1-20
3.2 Bucket specifications....................................................................................................................... 1-21
3.3 Dimensional specifications of loader............................................................................................... 1-22
3.4 Operational specifications of loader ................................................................................................1-23
4. Backhoe specifications ...........................................................................................................................1-25
4.1 Backhoe specifications.................................................................................................................... 1-25
4.2 Backhoe dimensions .......................................................................................................................1-26
4.3 Backhoe lift capacity .......................................................................................................................1-27
TRAVELING SPEEDS .....................................................................................................................................1-29
DIMENSIONS ..................................................................................................................................................1-31
2. GENERAL
IDENTIFICATION...............................................................................................................................................2-1
1. Tractor identification .................................................................................................................................2-1
1.1 Checking serial number and hour meter ...........................................................................................2-1
1.2 Cylinder number................................................................................................................................2-1
2. Checking mower identification..................................................................................................................2-2
3. Checking loader identification................................................................................................................... 2-2
4. Checking backhoe identification ...............................................................................................................2-2
GENERAL PRECAUTIONS...............................................................................................................................2-3
HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING ..........................................................2-5
LUBRICANTS, FUEL AND COOLANT ..............................................................................................................2-7
1. BX tractor..................................................................................................................................................2-7
1.1 Lubricants, fuel, and coolant .............................................................................................................2-7
1.1.1 Fuel...........................................................................................................................................2-8
1.1.2 Engine oil ..................................................................................................................................2-8
1.1.3 Transmission oil ........................................................................................................................2-8
1.2 Overview of biodiesel fuel (BDF)....................................................................................................... 2-9
2. Mower..................................................................................................................................................... 2-11
2.1 Lubricants........................................................................................................................................ 2-11
TIGHTENING TORQUES ................................................................................................................................2-13
BX23S, LA340, BT603, RCK54D, RCK60D, RCK54, RCK60B
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1. General use screws, bolts and nuts .......................................................................................................2-13
2. Stud bolts................................................................................................................................................2-13
3. Metric screws, bolts and nuts .................................................................................................................2-14
4. American standard screws, bolts and nuts with UNC or UNF threads ...................................................2-14
5. Plugs.......................................................................................................................................................2-14
6. Adapters, elbows and others ..................................................................................................................2-15
MAINTENANCE CHECK LIST......................................................................................................................... 2-17
1. BX tractor service intervals.....................................................................................................................2-17
2. Mower service intervals ..........................................................................................................................2-19
CHECK AND MAINTENANCE......................................................................................................................... 2-21
1. Periodic service ......................................................................................................................................2-21
1.1 Opening bonnet...............................................................................................................................2-21
1.2 Daily check......................................................................................................................................2-21
1.2.1 Walk around inspection...........................................................................................................2-21
1.2.2 Checking fuel gauge and refueling .........................................................................................2-21
1.2.3 Checking engine oil level ........................................................................................................2-22
1.2.4 Checking transmission fluid level............................................................................................ 2-22
1.2.5 Checking coolant level............................................................................................................2-23
1.2.6 Cleaning panel and radiator screen........................................................................................ 2-23
1.2.7 Checking brake pedal .............................................................................................................2-24
1.2.8 Checking gauges, meters, and Easy Checker™.....................................................................2-24
1.2.9 Checking head light, hazard light, and tail light ......................................................................2-24
1.2.10 Checking seat belt and ROPS ..............................................................................................2-24
1.2.11 Checking and cleaning electrical wiring and battery cables..................................................2-24
1.2.12 Checking movable parts .......................................................................................................2-25
1.3 Check points of initial 50 hours .......................................................................................................2-25
1.3.1 Changing engine oil ................................................................................................................2-25
1.3.2 Replacing engine oil filter........................................................................................................ 2-25
1.3.3 Replacing transmission oil filter .............................................................................................. 2-26
1.3.4 Changing transmission fluid.................................................................................................... 2-26
1.3.5 Cleaning transmission strainer ...............................................................................................2-27
1.4 Check points of every 50 hours....................................................................................................... 2-27
1.4.1 Greasing .................................................................................................................................2-27
1.4.2 Checking engine start system................................................................................................. 2-29
1.4.3 Checking operator presence control (OPC) system ............................................................... 2-29
1.4.4 Checking wheel bolt torque ....................................................................................................2-30
1.4.5 Cleaning lock lever shaft......................................................................................................... 2-30
1.5 Check points of every 100 hours..................................................................................................... 2-30
1.5.1 Checking battery condition .....................................................................................................2-30
1.5.2 Cleaning air cleaner element ..................................................................................................2-32
1.5.3 Checking fuel filter ..................................................................................................................2-32
1.5.4 Adjusting fan belt tension........................................................................................................ 2-33
1.5.5 Adjusting HST neutral spring ..................................................................................................2-33
1.5.6 Adjusting brake pedal .............................................................................................................2-34
1.6 Check point of every 200 hours ......................................................................................................2-34
1.6.1 Replacing engine oil filter........................................................................................................ 2-34
1.6.2 Changing engine oil ................................................................................................................2-35
1.6.3 Replacing transmission oil filter .............................................................................................. 2-35
1.6.4 Adjusting toe-in .......................................................................................................................2-36
1.7 Check points of every 400 hours..................................................................................................... 2-36
1.7.1 Adjusting front axle pivot......................................................................................................... 2-36
1.7.2 Changing transmission fluid.................................................................................................... 2-37
1.7.3 Cleaning transmission strainer ...............................................................................................2-38
1.7.4 Changing front axle case oil ...................................................................................................2-38
1.7.5 Replacing fuel filter element ...................................................................................................2-38
1.8 Check points of every 800 hours..................................................................................................... 2-39
1.8.1 Adjusting engine valve clearance ...........................................................................................2-39
1.9 Check points of every 1000 hours or 1 year ...................................................................................2-39
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BX23S, LA340, BT603, RCK54D, RCK60D, RCK54, RCK60B
KiSC issued 03, 2017 A
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1.9.1 Replacing air cleaner element ................................................................................................2-39
1.10 Check points of every 1500 hours................................................................................................. 2-39
1.10.1 Checking injection pressure of fuel injection nozzle ............................................................. 2-39
1.11 Check points of every 2000 hours or 2 years ................................................................................ 2-39
1.11.1 Flushing cooling system and changing coolant.....................................................................2-39
1.11.2 Antifreeze .............................................................................................................................. 2-40
1.12 Check points of every 3000 hours................................................................................................. 2-41
1.12.1 Checking injection pump....................................................................................................... 2-41
1.13 Check points of every 1 year......................................................................................................... 2-41
1.13.1 Checking intake air line......................................................................................................... 2-41
1.13.2 Checking radiator hoses and hose clamps........................................................................... 2-41
1.13.3 Checking power steering line................................................................................................ 2-41
1.13.4 Checking fuel lines................................................................................................................ 2-42
1.13.5 Checking engine breather hose............................................................................................2-42
1.14 Check points of every 4 years.......................................................................................................2-43
1.14.1 Replacing radiator hose........................................................................................................2-43
1.14.2 Replacing fuel hose ..............................................................................................................2-43
1.14.3 Replacing power steering hose ............................................................................................2-43
1.14.4 Replacing intake air line........................................................................................................ 2-43
1.14.5 Replacing engine breather hose...........................................................................................2-43
1.15 Service as required .......................................................................................................................2-43
1.15.1 Bleeding fuel system............................................................................................................. 2-43
1.15.2 Replacing fuse ......................................................................................................................2-43
1.15.3 Replacing light bulb ..............................................................................................................2-44
2. Mower.....................................................................................................................................................2-44
2.1 Check points of daily or each use ...................................................................................................2-44
2.1.1 Retightening mower blade screw............................................................................................ 2-44
2.1.2 Checking mower blade ...........................................................................................................2-45
2.1.3 Checking mower belt ..............................................................................................................2-45
2.1.4 Checking gear box oil level..................................................................................................... 2-45
2.1.5 Greasing spindle shafts, belt tension pivot and tension pulley ............................................... 2-46
2.1.6 Greasing front and rear anti-scalp rollers ...............................................................................2-46
2.1.7 Greasing universal joint ..........................................................................................................2-46
2.2 Check points of initial 50 hours .......................................................................................................2-47
2.2.1 Changing gear box oil.............................................................................................................2-47
2.3 Check point of every 150 hours ......................................................................................................2-47
2.3.1 Changing gear box oil.............................................................................................................2-47
2.4 Check points of every 1 year........................................................................................................... 2-47
2.4.1 Checking gear box oil seal...................................................................................................... 2-47
2.5 Check point of every 4 years........................................................................................................... 2-48
2.5.1 Replacing gear box oil seal..................................................................................................... 2-48
3. Front loader ............................................................................................................................................2-48
3.1 Check points of daily or each use ...................................................................................................2-48
3.1.1 Checking transmission fluid level............................................................................................ 2-48
3.1.2 Checking hydraulic hoses....................................................................................................... 2-48
3.2 Check points of every 10 hours....................................................................................................... 2-49
3.2.1 Greasing loader ......................................................................................................................2-49
3.3 Check points of every 50 hours....................................................................................................... 2-49
3.3.1 Checking torque of main frame bolt and nut........................................................................... 2-49
4. Backhoe..................................................................................................................................................2-49
4.1 Check points of daily or each use ...................................................................................................2-49
4.1.1 Checking transmission fluid level............................................................................................ 2-49
4.1.2 Checking hydraulic hoses....................................................................................................... 2-49
4.1.3 Checking backhoe mounting pin............................................................................................. 2-50
4.2 Check points of every 10 hours....................................................................................................... 2-50
4.2.1 Greasing backhoe................................................................................................................... 2-50
4.3 Check points of every 50 hours....................................................................................................... 2-51
4.3.1 Checking torque sub frame bolt and nut................................................................................. 2-51
BX23S, LA340, BT603, RCK54D, RCK60D, RCK54, RCK60B
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TIRES, WHEELS, AND BALLAST...................................................................................................................2-53
1. Tires........................................................................................................................................................2-53
1.1 Inflation pressure of tires.................................................................................................................2-53
1.2 Dual tires .........................................................................................................................................2-53
2. Wheel tread ............................................................................................................................................2-53
2.1 Front wheels.................................................................................................................................... 2-54
2.2 Rear wheels ....................................................................................................................................2-54
3. Ballast.....................................................................................................................................................2-55
3.1 Front ballast ....................................................................................................................................2-55
3.2 Rear ballast .....................................................................................................................................2-55
IMPLEMENT LIMITATIONS ............................................................................................................................. 2-57
1. Implement limitation tables .....................................................................................................................2-57
SPECIAL TOOLS.............................................................................................................................................2-61
1. Special tools for engine ..........................................................................................................................2-61
1.1 Special use puller set ......................................................................................................................2-61
1.2 Diesel engine compression tester (for injection nozzle).................................................................. 2-61
1.3 Nozzle tester ...................................................................................................................................2-61
1.4 Injection pump pressure tester........................................................................................................2-61
1.5 Valve guide replacing tool ...............................................................................................................2-62
1.6 Bushing replacing tool.....................................................................................................................2-63
1.7 Flywheel stopper .............................................................................................................................2-64
1.8 Crankshaft bearing 1 replacing tool ................................................................................................2-64
2. Special tools for tractor...........................................................................................................................2-65
2.1 Tie-rod end lifter ..............................................................................................................................2-65
2.2 Independent PTO clutch spring compression tool...........................................................................2-65
2.3 Disassembling and assembling stand (1/2) ....................................................................................2-66
2.4 Disassembling and assembling stand (2/2) ....................................................................................2-68
2.5 Check and high pressure relief valve assembly tool .......................................................................2-70
3. ENGINE
MECHANISM .....................................................................................................................................................3-1
1. Engine body..............................................................................................................................................3-1
1.1 Function of cylinder block.................................................................................................................. 3-1
1.2 Function of closed breather............................................................................................................... 3-1
1.3 Function of half-floating head cover ..................................................................................................3-1
1.4 Function of piston..............................................................................................................................3-2
1.5 Function of piston ring.......................................................................................................................3-2
1.6 Function of connecting rod................................................................................................................3-2
1.7 Function of crankshaft.......................................................................................................................3-2
1.8 Function of camshaft.........................................................................................................................3-3
1.9 Function of rocker arm ......................................................................................................................3-3
1.10 Function of flywheel ........................................................................................................................3-3
1.11 Function of timing gears ..................................................................................................................3-4
2. Lubricating system....................................................................................................................................3-5
2.1 Overview of lubricating system .........................................................................................................3-5
2.2 Function of oil strainer.......................................................................................................................3-7
2.3 Function of oil pump..........................................................................................................................3-7
2.4 Function of oil filter ............................................................................................................................3-7
2.5 Function of relief valve ......................................................................................................................3-8
2.6 Function of oil pressure switch..........................................................................................................3-8
3. Cooling system .........................................................................................................................................3-9
3.1 Overview of cooling system ..............................................................................................................3-9
3.2 Function of water pump................................................................................................................... 3-11
3.3 Function of radiator ......................................................................................................................... 3-11
3.4 Function of radiator cap .................................................................................................................. 3-11
4. Fuel system ............................................................................................................................................3-12
4.1 Overview of fuel system ..................................................................................................................3-12
4.2 Function of fuel filter........................................................................................................................3-12
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BX23S, LA340, BT603, RCK54D, RCK60D, RCK54, RCK60B
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4.3 Function of fuel feed pump.............................................................................................................. 3-12
4.4 Function of injection nozzle.............................................................................................................3-12
SERVICING .....................................................................................................................................................3-15
1. Troubleshooting for engine .....................................................................................................................3-15
2. Servicing specifications for engine .........................................................................................................3-19
3. Tightening torques for engine .................................................................................................................3-23
4. Checking and adjusting ..........................................................................................................................3-24
4.1 Engine body ....................................................................................................................................3-24
4.1.1 Checking compression pressure ............................................................................................3-24
4.1.2 Checking valve clearance....................................................................................................... 3-24
4.2 Lubricating system ..........................................................................................................................3-25
4.2.1 Checking engine oil pressure .................................................................................................3-25
4.3 Cooling system................................................................................................................................ 3-26
4.3.1 Checking fan belt tension .......................................................................................................3-26
4.3.2 Checking fan belt damage and wear ......................................................................................3-26
4.3.3 Checking radiator cap air leakage ..........................................................................................3-26
4.3.4 Checking radiator water leakage ............................................................................................3-27
4.3.5 Checking thermostat valve opening temperature ................................................................... 3-27
4.4 Fuel system.....................................................................................................................................3-28
4.4.1 Checking injection timing ........................................................................................................3-28
4.4.2 Checking fuel tightness of pump element............................................................................... 3-29
4.4.3 Checking fuel tightness of delivery valve................................................................................ 3-29
4.4.4 Checking nozzle spraying condition .......................................................................................3-29
4.4.5 Checking fuel injection pressure............................................................................................. 3-30
4.4.6 Checking valve seat tightness ................................................................................................3-30
4.4.7 Checking nozzle holder ..........................................................................................................3-31
5. Disassembling and assembling ..............................................................................................................3-31
5.1 Separating engine ...........................................................................................................................3-31
5.1.1 Draining engine oil ..................................................................................................................3-31
5.1.2 Removing battery.................................................................................................................... 3-32
5.1.3 Removing bonnet.................................................................................................................... 3-33
5.1.4 Disconnecting wiring harness and ground cables ..................................................................3-33
5.1.5 Disconnecting fuel hoses........................................................................................................3-34
5.1.6 Disconnecting accelerator wire............................................................................................... 3-34
5.1.7 Disconnecting propeller shaft assembly ................................................................................. 3-35
5.1.8 Separating engine................................................................................................................... 3-35
5.1.9 Draining coolant and removing outer engine parts .................................................................3-36
5.2 Disassembling the engine ...............................................................................................................3-36
5.2.1 Cylinder head and valve .........................................................................................................3-36
5.2.2 Gear case and timing gears.................................................................................................... 3-40
5.2.3 Piston and connecting rod ......................................................................................................3-44
5.2.4 Flywheel and crankshaft .........................................................................................................3-46
6. Servicing.................................................................................................................................................3-48
6.1 Cylinder head and valve.................................................................................................................. 3-48
6.1.1 Checking top clearance ..........................................................................................................3-48
6.1.2 Checking cylinder head surface flatness ................................................................................3-48
6.1.3 Checking cylinder head flaw ...................................................................................................3-49
6.1.4 Checking valve recessing .......................................................................................................3-49
6.1.5 Checking clearance between valve stem and valve guide ..................................................... 3-49
6.1.6 Replacing valve guide............................................................................................................. 3-50
6.1.7 Checking valve seating...........................................................................................................3-51
6.1.8 Correcting valve......................................................................................................................3-51
6.1.9 Correcting valve seat ..............................................................................................................3-51
6.1.10 Lapping valve........................................................................................................................ 3-52
6.1.11 Checking free length and tilt of valve spring .........................................................................3-52
6.1.12 Checking valve spring setting load .......................................................................................3-52
6.1.13 Checking oil clearance between rocker arm and rocker arm shaft....................................... 3-53
6.1.14 Checking push rod alignment ...............................................................................................3-53
BX23S, LA340, BT603, RCK54D, RCK60D, RCK54, RCK60B
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6.1.15 Checking oil clearance between tappet and tappet guide bore ............................................3-53
6.2 Timing gears, camshaft and governor gear..................................................................................... 3-54
6.2.1 Checking timing gear backlash............................................................................................... 3-54
6.2.2 Checking idle gear 1 side clearance....................................................................................... 3-54
6.2.3 Checking camshaft side clearance .........................................................................................3-54
6.2.4 Checking camshaft alignment................................................................................................. 3-55
6.2.5 Checking cam height ..............................................................................................................3-55
6.2.6 Checking oil clearance of camshaft journal ............................................................................ 3-55
6.2.7 Checking oil clearance between idle gear 1 shaft and idle gear bushing ...............................3-56
6.2.8 Replacing idle gear bushing ...................................................................................................3-56
6.3 Piston and connecting rod............................................................................................................... 3-56
6.3.1 Checking piston pin bore I.D................................................................................................... 3-56
6.3.2 Checking oil clearance between piston pin and small end bushing........................................ 3-56
6.3.3 Replacing small end bushing.................................................................................................. 3-57
6.3.4 Checking connecting rod alignment........................................................................................ 3-57
6.3.5 Checking piston ring gap ........................................................................................................3-57
6.3.6 Checking clearance between piston ring and piston ring groove ...........................................3-58
6.4 Crankshaft.......................................................................................................................................3-58
6.4.1 Checking crankshaft side clearance .......................................................................................3-58
6.4.2 Checking crankshaft alignment............................................................................................... 3-59
6.4.3 Checking oil clearance between crankpin and crankpin bearing............................................ 3-59
6.4.4 Checking oil clearance between crankshaft journal and crankshaft bearing 1 .......................3-60
6.4.5 Replacing crankshaft bearing 1 ..............................................................................................3-61
6.4.6 Checking oil clearance between crankshaft journal and crankshaft bearing 2 and
crankshaft bearing 3 ...............................................................................................................3-62
6.5 Cylinder ...........................................................................................................................................3-63
6.5.1 Checking cylinder wear........................................................................................................... 3-63
6.5.2 Correcting cylinder (Oversize) ................................................................................................ 3-63
6.6 Oil pump..........................................................................................................................................3-64
6.6.1 Checking rotor lobe clearance ................................................................................................3-64
6.6.2 Checking clearance between outer rotor and pump body ......................................................3-64
6.6.3 Checking clearance between rotor and cover ........................................................................3-64
6.7 Relief valve spring...........................................................................................................................3-65
6.7.1 Checking relief valve............................................................................................................... 3-65
4. TRANSAXLE
MECHANISM .....................................................................................................................................................4-1
1. Structure of transaxle ...............................................................................................................................4-1
2. Traveling system.......................................................................................................................................4-2
2.1 Hydrostatic transmission ...................................................................................................................4-2
2.1.1 Structure of hydrostatic transmission........................................................................................ 4-2
2.1.2 Oil flow of hydrostatic transmission ..........................................................................................4-3
2.1.3 Structure of HST control linkage............................................................................................... 4-8
2.1.4 Speed set linkage .....................................................................................................................4-9
2.2 Range gear shift section .................................................................................................................4-12
2.2.1 Structure of range gear shift ...................................................................................................4-12
2.3 Front wheel drive section ................................................................................................................4-13
2.3.1 Structure of front wheel drive..................................................................................................4-13
2.4 Differential gear section...................................................................................................................4-14
2.4.1 Structure of differential gears.................................................................................................. 4-14
2.4.2 Structure of differential lock ....................................................................................................4-16
2.5 Brake section ..................................................................................................................................4-17
2.5.1 Structure of brake system.......................................................................................................4-17
3. PTO system............................................................................................................................................4-19
3.1 Structure of PTO system.................................................................................................................4-19
3.1.1 Function of PTO clutch relief valve .........................................................................................4-20
3.1.2 Engaged function of PTO clutch .............................................................................................4-20
3.1.3 Disengaged function of PTO clutch ........................................................................................4-20
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3.2 Structure of mid and rear PTO ........................................................................................................4-21
4. Others.....................................................................................................................................................4-22
4.1 Hydraulic pump drive gear section.................................................................................................. 4-22
4.1.1 Structure of hydraulic pump drive gear................................................................................... 4-22
SERVICING .....................................................................................................................................................4-23
1. Troubleshooting for transaxle .................................................................................................................4-23
2. Servicing specifications for transaxle .....................................................................................................4-27
3. Tightening torques for transaxle .............................................................................................................4-28
4. Checking and adjusting ..........................................................................................................................4-29
4.1 Adjusting maximum speed ..............................................................................................................4-29
4.2 Adjusting HST neutral position........................................................................................................4-29
4.3 Checking and adjusting HST neutral spring (dynamic braking) ...................................................... 4-30
4.4 Checking charge relief pressure .....................................................................................................4-31
4.5 Checking high relief pressure (Forward) .........................................................................................4-32
4.6 Checking high relief pressure (Reverse)......................................................................................... 4-33
4.7 Readjusting relief valve (When HST does not work due to its loose hexagon socket head screw) 4-33
4.8 Checking PTO clutch operating pressure........................................................................................4-34
4.9 Adjusting brake pedal free travel..................................................................................................... 4-35
5. Disassembling and assembling ..............................................................................................................4-35
5.1 Separating transaxle .......................................................................................................................4-35
5.1.1 Draining transmission fluid...................................................................................................... 4-35
5.1.2 Removing battery.................................................................................................................... 4-36
5.1.3 Removing lift rod and lower link.............................................................................................. 4-36
5.1.4 Removing ROPS ....................................................................................................................4-37
5.1.5 Removing seat........................................................................................................................4-37
5.1.6 Removing step........................................................................................................................4-37
5.1.7 Removing fender ....................................................................................................................4-38
5.1.8 Removing fuel tank .................................................................................................................4-38
5.1.9 Removing rear wheel.............................................................................................................. 4-39
5.1.10 Removing fender center stay................................................................................................ 4-39
5.1.11 Removing fender bracket and hitch plate..............................................................................4-39
5.1.12 Removing transaxle assembly.............................................................................................. 4-40
5.1.13 Removing brake pedal..........................................................................................................4-41
5.1.14 Removing propeller shaft...................................................................................................... 4-41
5.1.15 Removing differential lock pedal........................................................................................... 4-41
5.1.16 Removing speed control pedal, HST damper, and cruise rod ..............................................4-42
5.2 Hydrostatic transmission .................................................................................................................4-42
5.2.1 Removing levers and mower lift arm ......................................................................................4-42
5.2.2 Removing PTO clutch valve....................................................................................................4-43
5.2.3 Removing oil cooler cover ......................................................................................................4-43
5.2.4 Removing center section and valve plates .............................................................................4-43
5.2.5 Removing check and high pressure relief valve plug .............................................................4-44
5.2.6 Checking check and high pressure relief valve ......................................................................4-44
5.2.7 Removing cylinder block......................................................................................................... 4-45
5.2.8 Removing cylinder block and piston .......................................................................................4-45
5.2.9 Removing swashplate and trust roller bearing........................................................................ 4-46
5.2.10 Removing 4WD detent ball ...................................................................................................4-47
5.2.11 Removing neutral arm and trunnion arm...............................................................................4-47
5.3 Hydraulic cylinder............................................................................................................................4-47
5.3.1 Removing hydraulic cylinder................................................................................................... 4-47
5.4 Transaxle shafts ..............................................................................................................................4-48
5.4.1 Removing transaxle case front cover .....................................................................................4-48
5.4.2 Removing hydraulic pump assembly ......................................................................................4-49
5.4.3 Removing rear PTO cover assembly...................................................................................... 4-50
5.4.4 Disassembling rear axle (L.H.) ...............................................................................................4-50
5.4.5 Removing rear axle case (R.H.) .............................................................................................4-51
5.4.6 Removing 66T final gear......................................................................................................... 4-52
5.4.7 Removing rear axle case, R.H. and brake.............................................................................. 4-53
BX23S, LA340, BT603, RCK54D, RCK60D, RCK54, RCK60B
vii
KiSC issued 03, 2017 A
Find manuals at https://best-manuals.com

5.4.8 Removing PTO clutch assembly............................................................................................. 4-54
5.5 Assembling shafts ...........................................................................................................................4-54
5.5.1 Assembling select arms and HST pump shaft (PTO clutch shaft).......................................... 4-54
5.5.2 Assembling front wheel drive shaft, shifter, spiral bevel pinion shaft and mid-PTO shaft....... 4-55
6. Servicing.................................................................................................................................................4-56
6.1 Hydrostatic transmission .................................................................................................................4-56
6.1.1 Checking center section .........................................................................................................4-56
6.1.2 Checking charge relief valve................................................................................................... 4-56
6.1.3 Checking check and high pressure relief valve ......................................................................4-56
6.1.4 Checking cylinder block assembly.......................................................................................... 4-57
6.1.5 Checking thrust washer, thrust roller bearing, thrust plate and cradle bearing....................... 4-57
6.1.6 Checking pump shaft (PTO clutch shaft) ................................................................................4-57
6.1.7 Checking needle bearing ........................................................................................................4-58
6.2 Transaxle case ................................................................................................................................4-58
6.2.1 Checking bearing....................................................................................................................4-58
6.2.2 Checking PTO clutch disc wear.............................................................................................. 4-58
6.2.3 Checking separate plate and back plate wear........................................................................ 4-58
6.2.4 Checking flatness of clutch piston, pressure plate and steel plate ......................................... 4-59
6.2.5 Checking clutch spring free length.......................................................................................... 4-59
6.2.6 Checking PTO brake disc wear ..............................................................................................4-59
6.2.7 Checking PTO brake plate...................................................................................................... 4-59
6.2.8 Checking clearance between differential case and differential side gear ...............................4-60
6.2.9 Checking clearance between differential pinion shaft and differential pinion.......................... 4-60
6.2.10 Checking backlash between differential pinion and differential side gear............................. 4-60
6.2.11 Checking backlash between spiral bevel pinion gear and bevel gear................................... 4-61
6.2.12 Checking brake cam lever movement ..................................................................................4-61
6.2.13 Checking flatness of actuator and bearing holder ................................................................4-61
6.2.14 Checking height of cam plate and ball.................................................................................. 4-62
6.2.15 Checking brake disc and friction plate wear ......................................................................... 4-62
5. FRONT AXLE
MECHANISM .....................................................................................................................................................5-1
1. Structure of front axle ...............................................................................................................................5-1
2. Front wheel alignment ..............................................................................................................................5-2
2.1 Camber of front axle.......................................................................................................................... 5-2
2.2 Kingpin angle of front axle.................................................................................................................5-2
2.3 Caster of front axle............................................................................................................................5-2
2.4 Toe-in of front axle.............................................................................................................................5-2
SERVICING .......................................................................................................................................................5-5
1. Troubleshooting for front axle ...................................................................................................................5-5
2. Servicing specifications for front axle .......................................................................................................5-6
3. Tightening torques for front axle ...............................................................................................................5-7
4. Checking and adjusting ............................................................................................................................5-8
4.1 Adjusting toe-in .................................................................................................................................5-8
4.2 Adjusting front axle rocking force ......................................................................................................5-8
4.3 Adjusting front wheel steering angle .................................................................................................5-9
5. Disassembling and assembling ................................................................................................................5-9
5.1 Separating front axle assembly.........................................................................................................5-9
5.1.1 Draining front axle case oil .......................................................................................................5-9
5.1.2 Removing battery...................................................................................................................... 5-9
5.1.3 Removing bonnet.................................................................................................................... 5-10
5.1.4 Removing front wheel and propeller shaft cover ....................................................................5-10
5.1.5 Disconnecting propeller shaft .................................................................................................5-10
5.1.6 Removing front axle assembly................................................................................................ 5-11
5.2 Front axle assembly ........................................................................................................................ 5-11
5.2.1 Removing power steering cylinder.......................................................................................... 5-11
5.2.2 Removing bevel gear case and front gear case .....................................................................5-12
5.2.3 Removing front gear case cover............................................................................................. 5-12
viii
BX23S, LA340, BT603, RCK54D, RCK60D, RCK54, RCK60B
KiSC issued 03, 2017 A
Find manuals at https://best-manuals.com

5.2.4 Removing 36T bevel gear and front axle shaft .......................................................................5-13
5.2.5 Removing front gear case and bevel gear case .....................................................................5-13
5.2.6 Removing bevel pinion shaft and differential gear assembly.................................................. 5-14
5.2.7 Removing differential gear...................................................................................................... 5-14
6. Servicing.................................................................................................................................................5-15
6.1 Checking clearance between differential case and differential side gear........................................ 5-15
6.2 Checking clearance between differential pinion shaft and differential pinion ..................................5-15
6.3 Checking backlash between differential pinion and differential side gear .......................................5-16
6.4 Checking turning torque of bevel pinion shaft .................................................................................5-16
6.5 Checking backlash between bevel pinion shaft and bevel gear...................................................... 5-17
6.6 Checking backlash between 12T bevel gear and 15T bevel gear ..................................................5-17
6.7 Checking clearance between center pin and pin support bushing.................................................. 5-18
6. STEERING
MECHANISM .....................................................................................................................................................6-1
1. Structure of steering system.....................................................................................................................6-1
2. Hydraulic circuit of steering ......................................................................................................................6-2
3. Steering controller ....................................................................................................................................6-3
3.1 Structure of steering controller ..........................................................................................................6-3
3.1.1 Control valve.............................................................................................................................6-3
3.1.2 Metering device ........................................................................................................................6-3
3.1.3 Relief valve ...............................................................................................................................6-4
4. Steering cylinder.......................................................................................................................................6-5
4.1 Structure of steering cylinder ............................................................................................................6-5
SERVICING .......................................................................................................................................................6-7
1. Troubleshooting for steering .....................................................................................................................6-7
2. Servicing specifications for steering .........................................................................................................6-9
3. Tightening torques for steering ...............................................................................................................6-10
4. Checking and adjusting .......................................................................................................................... 6-11
4.1 Checking relief valve operating pressure ........................................................................................ 6-11
5. Disassembling and assembling .............................................................................................................. 6-11
5.1 Power steering cylinder................................................................................................................... 6-11
5.1.1 Removing adapter and tie-rod ................................................................................................ 6-11
5.1.2 Disassembling steering cylinder ............................................................................................. 6-12
5.2 Separating power steering controller ..............................................................................................6-12
5.2.1 Removing battery.................................................................................................................... 6-12
5.2.2 Removing steering wheel .......................................................................................................6-13
5.2.3 Removing upper panel............................................................................................................ 6-13
5.2.4 Removing steering controller ..................................................................................................6-13
5.3 Separating power steering cylinder................................................................................................. 6-14
5.3.1 Removing bonnet.................................................................................................................... 6-14
5.3.2 Removing front axle assembly................................................................................................ 6-14
5.3.3 Removing power steering cylinder.......................................................................................... 6-15
6. Servicing.................................................................................................................................................6-15
6.1 Checking steering cylinder I.D. .......................................................................................................6-15
6.2 Checking clearance between rod and guide ...................................................................................6-15
7. HYDRAULIC SYSTEM
MECHANISM .....................................................................................................................................................7-1
1. Structure of hydraulic system ...................................................................................................................7-1
2. Hydraulic circuit ........................................................................................................................................7-2
3. Hydraulic pump......................................................................................................................................... 7-4
3.1 Outline of hydraulic pump .................................................................................................................7-4
3.2 Structure of hydraulic pump ..............................................................................................................7-4
3.3 Specification of hydraulic pump ........................................................................................................7-4
4. Control valve.............................................................................................................................................7-4
4.1 Outline of control valve...................................................................................................................... 7-4
4.2 Function of control valve ...................................................................................................................7-5
BX23S, LA340, BT603, RCK54D, RCK60D, RCK54, RCK60B
ix
KiSC issued 03, 2017 A

4.2.1 Control valve in neutral position................................................................................................ 7-5
4.2.2 Control valve in lift position .......................................................................................................7-6
4.2.3 Control valve in down position ..................................................................................................7-7
5. Flow priority valve.....................................................................................................................................7-8
5.1 Outline of flow priority valve ..............................................................................................................7-8
5.2 Structure of flow priority valve ...........................................................................................................7-9
5.3 Specification of flow priority valve ...................................................................................................7-10
6. Relief valve .............................................................................................................................................7-10
6.1 Outline of relief valve....................................................................................................................... 7-10
6.2 Structure of relief valve ................................................................................................................... 7-11
6.3 Function of relief valve ....................................................................................................................7-12
6.4 Specification of relief valve.............................................................................................................. 7-13
7. Hydraulic cylinder ...................................................................................................................................7-14
7.1 Structure of hydraulic cylinder......................................................................................................... 7-14
8. Hydraulic block type outlet...................................................................................................................... 7-15
8.1 Structure of hydraulic block type outlet ...........................................................................................7-15
9. Mower linkage ........................................................................................................................................7-16
9.1 Structure of mower linkage .............................................................................................................7-16
10. Front loader valve.................................................................................................................................7-17
10.1 Structure........................................................................................................................................7-17
10.1.1 Structure of front loader valve and pipe................................................................................ 7-17
10.1.2 Structure of front loader control valve................................................................................... 7-18
10.2 Front loader hydraulic circuit .........................................................................................................7-19
10.3 Function of loader control valve ....................................................................................................7-20
10.3.1 Loader control lever in neutral position................................................................................. 7-20
10.3.2 Loader control lever in up position........................................................................................ 7-21
10.3.3 Loader control lever in down position ...................................................................................7-23
10.3.4 Loader control lever in floating position ................................................................................7-25
10.3.5 Loader control lever in roll-back position .............................................................................. 7-27
10.3.6 Loader control lever in dump position................................................................................... 7-30
SERVICING .....................................................................................................................................................7-33
1. Troubleshooting for hydraulic system .....................................................................................................7-33
2. Servicing specifications for hydraulic system ......................................................................................... 7-34
3. Tightening torques for hydraulic system .................................................................................................7-35
4. Checking and adjusting ..........................................................................................................................7-36
4.1 Relief valve...................................................................................................................................... 7-36
4.1.1 Checking relief valve setting pressure ....................................................................................7-36
4.2 Pump and priority valve................................................................................................................... 7-36
4.2.1 Checking hydraulic pump oil flow ...........................................................................................7-36
4.2.2 Checking power steering oil flow ............................................................................................7-37
4.3 Mower lift linkage ............................................................................................................................7-38
4.3.1 Adjusting mower lift linkage ....................................................................................................7-38
5. Disassembling and assembling ..............................................................................................................7-38
5.1 Hydraulic pump ...............................................................................................................................7-38
5.1.1 Removing battery.................................................................................................................... 7-38
5.1.2 Removing lift rod and lower link.............................................................................................. 7-39
5.1.3 Removing ROPS ....................................................................................................................7-39
5.1.4 Removing seat........................................................................................................................7-40
5.1.5 Removing step........................................................................................................................7-40
5.1.6 Removing fender ....................................................................................................................7-40
5.1.7 Removing fuel tank .................................................................................................................7-41
5.1.8 Removing fender center stay..................................................................................................7-41
5.1.9 Removing hydraulic pump ......................................................................................................7-41
5.2 Hydraulic cylinder block ..................................................................................................................7-42
5.2.1 Removing battery.................................................................................................................... 7-42
5.2.2 Removing lift rod and lower link.............................................................................................. 7-43
5.2.3 Removing ROPS ....................................................................................................................7-43
5.2.4 Removing seat........................................................................................................................7-43
x
BX23S, LA340, BT603, RCK54D, RCK60D, RCK54, RCK60B
KiSC issued 03, 2017 A

5.2.5 Removing step........................................................................................................................7-43
5.2.6 Removing fender ....................................................................................................................7-44
5.2.7 Removing fuel tank .................................................................................................................7-44
5.2.8 Removing fender center stay.................................................................................................. 7-45
5.2.9 Removing mower linkage and wire harness ...........................................................................7-45
5.2.10 Removing hydraulic cylinder block .......................................................................................7-45
5.3 Hydraulic cylinder and control valve................................................................................................ 7-46
5.3.1 Removing control valve ..........................................................................................................7-46
5.3.2 Removing control valve lever.................................................................................................. 7-46
5.3.3 Removing lift arm, hydraulic arm shaft and hydraulic arm...................................................... 7-46
5.3.4 Removing hydraulic piston...................................................................................................... 7-47
5.3.5 Removing lowering speed adjusting valve.............................................................................. 7-47
5.4 Mower lift linkage ............................................................................................................................7-48
5.4.1 Disassembling mower linkage ................................................................................................ 7-48
5.5 Control valve (Front loader) ............................................................................................................7-49
5.5.1 Removing battery.................................................................................................................... 7-49
5.5.2 Removing ROPS ....................................................................................................................7-49
5.5.3 Removing seat........................................................................................................................7-49
5.5.4 Removing step........................................................................................................................7-49
5.5.5 Removing fender ....................................................................................................................7-50
5.5.6 Removing control valve ..........................................................................................................7-50
5.5.7 Disassembling control valve ...................................................................................................7-51
6. Servicing.................................................................................................................................................7-52
6.1 Hydraulic pump ...............................................................................................................................7-52
6.1.1 Checking clearance between tip of gear tooth and casing .....................................................7-52
6.1.2 Checking clearance between bushing and shaft ....................................................................7-52
6.1.3 Checking side plate thickness ................................................................................................7-53
6.2 Hydraulic cylinder............................................................................................................................7-53
6.2.1 Checking hydraulic cylinder bore............................................................................................ 7-53
6.2.2 Checking hydraulic arm shaft bushing.................................................................................... 7-53
8. ELECTRICAL SYSTEM
MECHANISM .....................................................................................................................................................8-1
1. Wiring diagram of BX tractor ....................................................................................................................8-1
2. Electrical connector chart .........................................................................................................................8-2
3. Reading electrical circuit diagrams........................................................................................................... 8-3
3.1 How to read wiring diagram ..............................................................................................................8-3
3.2 Layout of connector diagrams...........................................................................................................8-6
3.3 Precautions on handling electrical connectors.................................................................................. 8-7
4. Starting system.........................................................................................................................................8-8
4.1 Electrical circuit of starting system ....................................................................................................8-8
4.2 Function of relay................................................................................................................................ 8-9
4.3 Function of starter .............................................................................................................................8-9
4.4 Function of glow plug ......................................................................................................................8-10
4.5 Function of safety switch.................................................................................................................8-10
4.6 Function of fuel pump...................................................................................................................... 8-10
5. OPC (Operator Presence Control) system ............................................................................................. 8-11
5.1 Electrical circuit of OPC timer.......................................................................................................... 8-11
6. Charging system..................................................................................................................................... 8-12
6.1 Electrical circuit for charging system............................................................................................... 8-12
6.2 Function of IC regulator (3P connector type) ..................................................................................8-13
7. Lighting system.......................................................................................................................................8-14
7.1 Electrical circuit for lighting system ................................................................................................. 8-14
8. Gauges ...................................................................................................................................................8-15
8.1 Electrical circuit of gauge system.................................................................................................... 8-15
8.2 Meter panel .....................................................................................................................................8-16
8.2.1 Function of hour meter............................................................................................................ 8-16
8.2.2 Function of tachometer ...........................................................................................................8-16
BX23S, LA340, BT603, RCK54D, RCK60D, RCK54, RCK60B
xi
KiSC issued 03, 2017 A

8.2.3 Function of fuel gauge ............................................................................................................8-16
8.2.4 Function of coolant temperature gauge ..................................................................................8-16
8.3 Function of fuel level sensor ...........................................................................................................8-17
8.4 Function of coolant temperature sensor.......................................................................................... 8-17
8.5 Function of oil pressure switch........................................................................................................ 8-18
9. Others.....................................................................................................................................................8-19
9.1 Electrical circuit for accessory......................................................................................................... 8-19
9.2 Function of DC outlet ......................................................................................................................8-20
SERVICING .....................................................................................................................................................8-21
1. Troubleshooting for electrical system .....................................................................................................8-21
2. Servicing specifications for electrical system .........................................................................................8-27
3. Tightening torques for electrical system .................................................................................................8-28
4. Checking and adjusting ..........................................................................................................................8-29
4.1 Battery.............................................................................................................................................8-29
4.1.1 Checking battery voltage ........................................................................................................8-29
4.1.2 Checking battery terminal connection..................................................................................... 8-29
4.1.3 Checking battery specific gravity ............................................................................................8-29
4.2 Main switch .....................................................................................................................................8-30
4.2.1 Checking main switch connector voltage................................................................................ 8-30
4.2.2 Checking main switch continuity at off position.......................................................................8-30
4.2.3 Checking main switch continuity at on position ......................................................................8-31
4.2.4 Checking main switch continuity at preheat position .............................................................. 8-31
4.2.5 Checking main switch continuity at start position ...................................................................8-31
4.3 Starter .............................................................................................................................................8-31
4.3.1 Checking motor....................................................................................................................... 8-31
4.3.2 Testing starter magnet switch (pull-in, holding coils) .............................................................. 8-32
4.4 Glow plug ........................................................................................................................................8-32
4.4.1 Checking glow plug lead terminal voltage ..............................................................................8-32
4.4.2 Checking glow plug continuity ................................................................................................8-33
4.5 Safety switch ...................................................................................................................................8-33
4.5.1 Checking PTO shift lever switch continuity............................................................................. 8-33
4.5.2 Checking HST neutral switch continuity .................................................................................8-34
4.6 Operator presence control (OPC) system....................................................................................... 8-34
4.6.1 Checking seat switch and seat turnover switch continuity...................................................... 8-34
4.6.2 Checking OPC timer ...............................................................................................................8-35
4.7 Fuel pump .......................................................................................................................................8-36
4.7.1 Checking fuel pump connector voltage................................................................................... 8-36
4.7.2 Checking fuel pump continuity................................................................................................ 8-36
4.8 Engine stop solenoid.......................................................................................................................8-36
4.8.1 Testing engine stop solenoid .................................................................................................. 8-36
4.9 Timer relay ......................................................................................................................................8-37
4.9.1 Checking timer relay connector voltage.................................................................................. 8-37
4.9.2 Testing timer relay...................................................................................................................8-37
4.10 Charging system ...........................................................................................................................8-37
4.10.1 Checking battery charging current........................................................................................ 8-37
4.11 Combination switch .......................................................................................................................8-38
4.11.1 Removing combination switch...............................................................................................8-38
4.11.2 Checking combination switch connector voltage ..................................................................8-38
4.11.3 Checking head light switch continuity when setting switch at OFF position..........................8-38
4.11.4 Checking head light switch continuity when setting switch at ON position ...........................8-39
4.11.5 Checking turn signal light switch continuity when setting switch knob at OFF position ........8-39
4.11.6 Checking turn signal light switch continuity when setting switch knob at RIGHT position ....8-40
4.11.7 Checking turn signal light switch continuity when setting switch knob at LEFT position....... 8-40
4.11.8 Checking hazard switch continuity when setting switch knob at OFF position .....................8-41
4.11.9 Checking hazard switch continuity when setting switch knob at ON position .......................8-41
4.11.10 Checking flasher unit connector voltage .............................................................................8-41
4.11.11 Testing flasher unit actuation...............................................................................................8-42
4.12 Gauge ...........................................................................................................................................8-43
xii
BX23S, LA340, BT603, RCK54D, RCK60D, RCK54, RCK60B
KiSC issued 03, 2017 A

4.12.1 Checking charge lamp (charging circuit) ..............................................................................8-43
4.12.2 Checking engine oil pressure lamp....................................................................................... 8-43
4.12.3 Checking engine oil pressure switch continuity .................................................................... 8-44
4.12.4 Checking fuel level sensor continuity.................................................................................... 8-44
4.12.5 Checking coolant temperature sensor connector voltage..................................................... 8-44
4.12.6 Checking coolant temperature sensor continuity.................................................................. 8-45
4.12.7 Checking hour meter and tachometer ..................................................................................8-45
4.13 Accessory...................................................................................................................................... 8-46
4.13.1 Checking DC outlet connector voltage .................................................................................8-46
4.13.2 Checking DC outlet continuity............................................................................................... 8-46
4.14 Meter panel ...................................................................................................................................8-46
4.14.1 Checking connector voltage, sensor resistance and switch ................................................. 8-46
5. Disassembling and assembling ..............................................................................................................8-47
5.1 Starter .............................................................................................................................................8-47
5.1.1 Disassembling starter motor ...................................................................................................8-47
5.1.2 Removing magnet switch........................................................................................................ 8-48
5.1.3 Removing plunger................................................................................................................... 8-48
5.2 Alternator.........................................................................................................................................8-48
5.2.1 Removing pulley .....................................................................................................................8-48
5.2.2 Removing rear end cover .......................................................................................................8-48
5.2.3 Removing brush holder........................................................................................................... 8-48
5.2.4 Removing IC regulator............................................................................................................ 8-49
5.2.5 Removing rectifier................................................................................................................... 8-49
5.2.6 Removing rear end frame .......................................................................................................8-49
5.2.7 Removing rotor .......................................................................................................................8-49
5.2.8 Removing retainer plate.......................................................................................................... 8-50
5.2.9 Removing bearing on drive end side ......................................................................................8-50
5.2.10 Removing bearing at slip ring side........................................................................................ 8-50
6. Servicing.................................................................................................................................................8-50
6.1 Starter .............................................................................................................................................8-50
6.1.1 Checking overrunning clutch ..................................................................................................8-50
6.1.2 Checking commutator and mica .............................................................................................8-51
6.1.3 Checking brush wear ..............................................................................................................8-51
6.1.4 Checking brush holder............................................................................................................8-52
6.1.5 Checking armature coil ...........................................................................................................8-52
6.1.6 Checking field coil...................................................................................................................8-52
6.2 Alternator.........................................................................................................................................8-52
6.2.1 Checking bearing....................................................................................................................8-52
6.2.2 Checking stator.......................................................................................................................8-53
6.2.3 Checking rotor ........................................................................................................................8-53
6.2.4 Checking slip ring ...................................................................................................................8-53
6.2.5 Checking brush wear ..............................................................................................................8-53
6.2.6 Checking rectifier ....................................................................................................................8-54
9. MOWER
MECHANISM .....................................................................................................................................................9-1
1. Structure of power transmission of mower ...............................................................................................9-1
2. Structure of lifting mechanism of mower ..................................................................................................9-2
SERVICING .......................................................................................................................................................9-3
1. Troubleshooting for mower .......................................................................................................................9-3
2. Servicing specifications for mower ...........................................................................................................9-4
3. Tightening torques for mower ...................................................................................................................9-5
4. Setting up mower [RCK54D-26BX and RCK60D-26BX] ..........................................................................9-6
4.1 Assembling mower............................................................................................................................9-6
4.2 Setting mower ...................................................................................................................................9-6
4.3 Mounting front link.............................................................................................................................9-7
4.4 Mounting frame link...........................................................................................................................9-8
4.5 Setting tractor....................................................................................................................................9-8
BX23S, LA340, BT603, RCK54D, RCK60D, RCK54, RCK60B
xiii
KiSC issued 03, 2017 A

4.6 Mounting mower................................................................................................................................ 9-9
5. Checking and adjusting ..........................................................................................................................9-10
5.1 Mower adjustment...........................................................................................................................9-10
5.1.1 Adjusting mower link............................................................................................................... 9-10
5.1.2 Adjusting front and rear cutting height ....................................................................................9-10
5.1.3 Adjusting left and right cutting height...................................................................................... 9-11
5.1.4 Adjusting cutting height........................................................................................................... 9-12
5.2 Checking mower blade and belt......................................................................................................9-14
5.2.1 Checking mower blade ...........................................................................................................9-14
5.2.2 Checking mower belt ..............................................................................................................9-14
6. Disassembling and assembling ..............................................................................................................9-15
6.1 Removing ramps and belt covers.................................................................................................... 9-15
6.2 Removing mower blades................................................................................................................. 9-15
6.3 Removing blade boss...................................................................................................................... 9-15
6.4 Removing gear box and mower belt ...............................................................................................9-16
6.5 Disassembling gear box..................................................................................................................9-16
6.6 Removing center pulley holder........................................................................................................ 9-17
6.7 Removing outer pulley and blade shaft...........................................................................................9-17
7. Servicing.................................................................................................................................................9-18
7.1 Adjusting turning torque of pinion shaft...........................................................................................9-18
7.2 Adjusting backlash between bevel gears ........................................................................................9-18
10. FRONT LOADER
MECHANISM ...................................................................................................................................................10-1
1. Hydraulic circuit ......................................................................................................................................10-1
2. Front remote hydraulic control system (if equipped) ..............................................................................10-3
2.1 Operating control lever....................................................................................................................10-3
3. Boom cylinder and bucket cylinder.........................................................................................................10-4
3.1 Structure of boom cylinder and bucket cylinder ..............................................................................10-4
4. One touch front loader............................................................................................................................10-5
4.1 Outline of one touch front loader.....................................................................................................10-5
5. One lever quick touch 4 lines coupler..................................................................................................... 10-5
5.1 Structure of one lever quick touch 4 lines coupler ..........................................................................10-5
6. Auto lock attachment and detachment ...................................................................................................10-5
6.1 Outline of auto lock attachment and detachment............................................................................10-5
6.2 Function of auto lock attachment and detachment .........................................................................10-6
7. Mechanical loader frame standing mechanism ......................................................................................10-6
7.1 Structure of mechanical loader frame standing mechanism ........................................................... 10-6
8. 3rd function valve (If equipped) ..............................................................................................................10-7
8.1 Structure of 3rd function valve ........................................................................................................10-7
8.2 Function of 3rd function valve .........................................................................................................10-8
8.2.1 Activation switch in off position ...............................................................................................10-8
8.2.2 Activation switch in on position ...............................................................................................10-9
SERVICING ................................................................................................................................................... 10-11
1. Troubleshooting for front loader............................................................................................................ 10-11
2. Tightening torques for front loader........................................................................................................10-13
3. Checking and adjusting ........................................................................................................................10-14
3.1 Loader stand .................................................................................................................................10-14
3.1.1 Adjusting height of loader stand ...........................................................................................10-14
3.2 Front hydraulic valve main switch and relay .................................................................................10-17
3.2.1 Checking front hydraulic valve main switch continuity.......................................................... 10-17
3.2.2 Checking connector voltage of front hydraulic valve main switch......................................... 10-18
3.2.3 Checking relay ......................................................................................................................10-18
3.3 3rd function solenoid valve............................................................................................................ 10-19
3.3.1 Checking 3rd function solenoid valve continuity ...................................................................10-19
3.3.2 Checking connector voltage of 3rd function solenoid valve.................................................. 10-19
4. Disassembling and assembling ............................................................................................................10-19
4.1 Removing and attaching front loader ............................................................................................10-19
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BX23S, LA340, BT603, RCK54D, RCK60D, RCK54, RCK60B
KiSC issued 03, 2017 A

4.1.1 Removing loader................................................................................................................... 10-19
4.1.2 Reinstalling loader ................................................................................................................10-23
4.2 Bucket, boom and hydraulic cylinders........................................................................................... 10-26
4.2.1 Attaching attachments ..........................................................................................................10-26
4.2.2 Removing attachments .........................................................................................................10-28
4.2.3 Removing bucket cylinder..................................................................................................... 10-29
4.2.4 Removing boom cylinder and hydraulic tubes ......................................................................10-29
4.2.5 Removing piston rod assembly............................................................................................. 10-29
4.2.6 Removing cylinder head, piston and nut............................................................................... 10-30
4.2.7 Removing piston seal and O-ring .........................................................................................10-31
4.2.8 Installing O-ring and piston seal ...........................................................................................10-31
4.3 Side frames, front guard and main frames.................................................................................... 10-31
4.3.1 Removing side frames ..........................................................................................................10-31
4.3.2 Removing front guard ...........................................................................................................10-32
4.3.3 Removing main frames......................................................................................................... 10-32
4.4 3rd function valve (If equipped).....................................................................................................10-32
4.4.1 Removing 3rd function valve ................................................................................................10-32
4.4.2 Removing hydraulic tubes of 3rd function............................................................................. 10-33
5. Servicing...............................................................................................................................................10-33
5.1 Piston rod ......................................................................................................................................10-33
5.1.1 Checking piston rod bend .....................................................................................................10-33
11. BACKHOE
MECHANISM ................................................................................................................................................... 11-1
1. Hydraulic circuit ...................................................................................................................................... 11-1
2. Control valve........................................................................................................................................... 11-2
2.1 Structure of backhoe control valve.................................................................................................. 11-2
2.2 Function of backhoe control valve................................................................................................... 11-4
2.2.1 Backhoe control valve in neutral position ............................................................................... 11-4
2.2.2 Backhoe control valve in swing right position ......................................................................... 11-5
2.2.3 Backhoe control valve in swing left position ........................................................................... 11-6
2.2.4 Backhoe control valve in boom up position ............................................................................ 11-7
2.2.5 Backhoe control valve in boom down position........................................................................ 11-8
2.2.6 Backhoe control valve in L.H. stabilizer shrink position .......................................................... 11-9
2.2.7 Backhoe control valve in L.H. stabilizer extend position....................................................... 11-10
2.2.8 Backhoe control valve in R.H. stabilizer shrink position ....................................................... 11-11
2.2.9 Backhoe control valve in R.H. stabilizer extend position ...................................................... 11-12
2.2.10 Backhoe control valve in dipperstick crowd position........................................................... 11-13
2.2.11 Backhoe control valve in dipperstick extend position.......................................................... 11-14
2.2.12 Backhoe control valve in bucket roll-back position ............................................................. 11-15
2.2.13 Backhoe control valve in bucket dump position.................................................................. 11-16
2.3 Structure of overload relief valve................................................................................................... 11-17
2.3.1 Function of relief position...................................................................................................... 11-17
2.3.2 Function of anti-cavitation position ....................................................................................... 11-18
3. Structure of hydraulic cylinder .............................................................................................................. 11-19
SERVICING ................................................................................................................................................... 11-21
1. Troubleshooting for backhoe ................................................................................................................ 11-21
2. Servicing specifications for backhoe .................................................................................................... 11-23
3. Tightening torques for backhoe ............................................................................................................ 11-25
4. Checking and adjusting ........................................................................................................................ 11-26
4.1 Checking relief valve setting pressure .......................................................................................... 11-26
4.2 Checking control lever operation force.......................................................................................... 11-26
4.3 Checking stabilizer control lever operation force .......................................................................... 11-26
5. Disassembling and assembling ............................................................................................................ 11-26
5.1 Removing backhoe ....................................................................................................................... 11-26
5.1.1 Preparing to remove backhoe............................................................................................... 11-26
5.1.2 Releasing mounting pins ...................................................................................................... 11-27
5.1.3 Disconnecting hydraulic hoses ............................................................................................. 11-28
BX23S, LA340, BT603, RCK54D, RCK60D, RCK54, RCK60B
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KiSC issued 03, 2017 A

5.1.4 Removing backhoe ............................................................................................................... 11-28
5.2 Installing backhoe ......................................................................................................................... 11-28
5.2.1 Preparing to install backhoe ................................................................................................. 11-28
5.2.2 Connecting hydraulic hoses.................................................................................................. 11-29
5.2.3 Setting mounting pins ........................................................................................................... 11-29
5.2.4 Installing backhoe ................................................................................................................. 11-29
5.3 Disassembling backhoe ................................................................................................................ 11-30
5.3.1 Removing bucket .................................................................................................................. 11-31
5.3.2 Removing dipperstick and bucket cylinder ........................................................................... 11-31
5.3.3 Removing dipperstick cylinder, boom, boom cylinder, and hoses ........................................ 11-32
5.3.4 Removing swing frame ......................................................................................................... 11-33
5.3.5 Removing swing cylinder ...................................................................................................... 11-33
5.3.6 Removing stabilizers and stabilizer cylinder ......................................................................... 11-33
5.3.7 Removing lever support and control valve............................................................................ 11-34
5.3.8 Removing backhoe main frame ............................................................................................ 11-35
5.4 Disassembling control valve.......................................................................................................... 11-35
5.5 Disassembling cylinder (Boom, dipperstick, bucket, swing, stabilizer) ......................................... 11-35
5.5.1 Removing cylinder rod assembly.......................................................................................... 11-35
5.5.2 Removing cylinder head, piston, and nut.............................................................................. 11-36
5.5.3 Checking cylinder adaptor angle .......................................................................................... 11-36
5.5.4 Removing piston seal and O-ring ......................................................................................... 11-37
5.5.5 Installing O-ring and piston seal ........................................................................................... 11-37
6. Servicing............................................................................................................................................... 11-38
6.1 Checking clearance between pin and bushing.............................................................................. 11-38
6.2 Checking thrust washer wear........................................................................................................ 11-41
6.3 Checking piston rod bend ............................................................................................................. 11-41
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BX23S, LA340, BT603, RCK54D, RCK60D, RCK54, RCK60B
KiSC issued 03, 2017 A

1. INFORMATION
KiSC issued 03, 2017 A

SAFETY FIRST
1. Safety first
This symbol, the industry's "Safety Alert Symbol", is used throughout this manual and on labels on the machine itself
to warn of the possibility of personal injury. Read these instructions carefully. It is essential that you read the
instructions and safety regulations before you try to repair or use this unit.
DANGER
• Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.
WARNING
• Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
CAUTION
• Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.
IMPORTANT
• Indicates that equipment or property damage could result if instructions are not followed.
NOTE
• Gives helpful information.
SAFETY FIRST
1. Safety first 1. INFORMATION
BX23S, LA340, BT603, RCK54D, RCK60D, RCK54, RCK60B
1-1
KiSC issued 03, 2017 A