Jacobsen SXG323 User manual

LAWN MOWERS:
MOWER DECKS:
COLLECTORS:
SCMB48 & SCMA54
SBC550X & 600X

ISEKI LAWN MOWERS
1
This service manual has been prepared to provide the information and suggestions necessary
for servicing the ISEKI SXG Lawn Mower. These include construction, specifications, removal
and reinstallation of the components, disassembly and reassembly instructions, inspection and
adjustment instructions, troubleshooting, general precautions etc.
Figures mentioned in this manual are standard values established by ISEKI for the SXG,
consequently when a non-ISEKI part has been installed on the machine or adjustments and
repairs have been made in a manner other than as specified in this manual, the pertinent values
mentioned herein are no longer valid. ISEKI does not assume responsibility for problems or
damage caused by a value deviation due to maladjustment or by the use of unauthorized parts.
Servicing procedures outlined in the manual contain sufficient information to return all
component parts of a machine to new condition. In discussion of each component part, it is
assumed that a complete overhaul is being performed, consequently, complete disassembly and
reassembly are outlined. The machine is relied upon to decide how far disassembly must be
carried out when complete overhaul is not required.
Study unfamiliar service procedures thoroughly and understand them clearly before attempting
disassembly. Specific data essential for proper overhaul, such as running clearances and torque
values, have been provided in interline of inspection and reassembling procedures of each
group section.
This manual was compiled from latest information available at time of publication, However
ISEKI reserves the right to make changes at any time without notice.
Whenever the terms “left” and“ right” are used, this means as viewed by the operator when
seated in the operator’s seat.
Whenever servicing the machines, pay sufficient attention to the operational safety to protect you
and other persons around the machines from danger by following carefully the instructions given
in the manual. Never take chances!
FOREWORD

SERVICE MANUAL FOR SXG323&326
2
TOTAL CONTENTS
LAWN MOWERS
CHAPTER 1. GENERAL INFORMATION ......................................................................................11
CHAPTER 2. DISASSEMBLY OF MAJOR COMPONENTS..........................................................17
CHAPTER 3. ENGINE ACCESSORIES.........................................................................................27
CHAPTER 4. ENGINE ....................................................................................................................33
CHAPTER 5. LUBRICATION SYSTEM..........................................................................................67
CHAPTER 6. COOLING SYSTEM..................................................................................................73
CHAPTER 7. FUEL SYSTEM.........................................................................................................75
CHAPTER 8. TRANSMISSION AND RELATED PARTS ...............................................................87
CHAPTER 9. REAR AXLE .............................................................................................................93
CHAPTER 10. HYDROSTATIC TRANSMISSION..........................................................................95
CHAPTER 11. HYDRAULIC SYSTEM .........................................................................................117
CHAPTER 12. POWER STEERING SYSTEM .............................................................................121
CHAPTER 13. ELECTRICAL ACCESSORIES ............................................................................127
MOWER DECKS
CHAPTER 1. FOR SAFETY LABELS..............................................................................................5
CHAPTER 2. SPECIFICATIONS ......................................................................................................7
CHAPTER 3. ATTACHING AND DETACHING THE MOWER DECK..............................................9
CHAPTER 4. MOWER OPERATION..............................................................................................11
CHAPTER 5. INSPECTION AND MAINTAINANCE OF MAJOR PARTS......................................17
CHAPTER 6. DISASSEMBLY AND REASSEMBLY OF GEAR BOX............................................25
CHAPTER 7. INSPECTION OF MOWER DECK SCMA TYPE......................................................29
CHAPTER 8. TROUBLESHOOTING..............................................................................................33
COLLECTORS
CHAPTER 1. SAFETY LABELS.......................................................................................................5
CHAPTER 2. SPECIFICATIONS ......................................................................................................7
CHAPTER 3. NAME OF MAJOR COMPONENTS...........................................................................9
CHAPTER 4. DETACHING AND ATTACHING THE COLLECTOR............................................... 11
CHAPTER 5. COLLECTOR OPERATION......................................................................................15
CHAPTER 6. INSPECTION AND MAINTAINANCE OF MAJOR PARTS......................................17
CHAPTER 7. ASSEMBLY INSTRUCTION.....................................................................................21
CHAPTER 8. TROUBLESHOOTING..............................................................................................47

I
S
EKI LAWN M
O
WER
S
S
X
G
323 & 32
6
ISEKI LAWN MOWERS
SXG323 & 326
CHAPTER 1
CHAPTER 2
CHAPTER 3
CHAPTER 4
CHAPTER 5
CHAPTER 6
CHAPTER 7
CHAPTER 8
CHAPTER 9
CHAPTER 10
CHAPTER 11
CHAPTER 12
CHAPTER 13

ISEKI LAWN MOWERS
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TABLE OF CONTENTS
FOREWORD.....................................................................................................................................1
TOTAL CONTENTS..........................................................................................................................2
TABLE OF CONTENTS....................................................................................................................5
CHAPTER 1. GENERAL INFORMATION ......................................................................................11
1. MODEL NAME AND IDENTIFICATIONS NUMBERS.............................................................. 11
2. SPECIFICATIONS...................................................................................................................12
3. EXTERIOR VIEW ....................................................................................................................13
4. PERIODIC INSPECTION TABLE ............................................................................................14
5. FILLING DIAGRAM..................................................................................................................15
CHAPTER 2. DISASSEMBLY OF MAJOR COMPONENTS..........................................................17
1. GENERAL PRECAUTIONS FOR SEPARATION AND REINSTALLATION.............................17
1.1. BEFORE OPERATION.....................................................................................................17
1.2. PRECAUTIONS TO BE FOLLOWED WHEN INSTALLING COMMON PARTS...............17
2. DISASSEMBLY OF FUNCTIONAL BLOCKS ..........................................................................20
2.1. REMOVAL OF THE MOWER DECK ................................................................................20
2.2. DETACHING THE COLLECTOR......................................................................................21
2.2.1. DETACHING THE HIGH DUMP COLLECTOR ..........................................................21
2.2.2. DETACHING THE LOW DUMP COLLECTOR...........................................................21
2.3. REMOVAL OF MAJOR FUNCTIONAL COMPONENTS ..................................................22
2.3.1. REMOVAL OF FENDER(WING) PANEL....................................................................22
2.3.2. REMOVAL OF FLOOR STEP, COVER AND FUEL TANK..........................................22
2.3.3. REMOVAL OF STEERING HEEL,METER PANEL.....................................................23
2.3.4. REMOVAL OF RADIATOR .........................................................................................23
2.3.5. REMOVAL OF ENGINE..............................................................................................24
2.3.6. REMOVAL OF REARAXLE CASE.............................................................................24
2.3.7. REMOVAL OF TRANSMISSION CASE......................................................................25
2.3.8. REMOVAL OF FRONTAXLE CASE AND STEERING CYLINDER............................25
3. REINSTALLATION...................................................................................................................26
CHAPTER 3. ENGINE ACCESSORIES .........................................................................................27
1. RADIATOR...............................................................................................................................27
2. COOLING FAN AND BELT......................................................................................................28
3. AIR CLEANER.........................................................................................................................29
4. FUEL SYSTEM........................................................................................................................29
5. TROUBLE SHOOTING............................................................................................................31

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CHAPTER 4. ENGINE ....................................................................................................................33
1. ENGINE...................................................................................................................................33
1.1. SPECIFICATIONS............................................................................................................33
1.2. PERFORMANCE CURVES..............................................................................................34
2. INSPECTION AND ADJUSTMENT..........................................................................................35
2.1. INSPECTION OF ENGINE OIL........................................................................................35
2.2. INSPECTION OF FAN BELT............................................................................................35
2.3. INSPECTION AND ADJUSTMENT OF VALVE CLEARANCES.......................................36
2.3.1. Remove the cylinder head cover. ...............................................................................36
2.3.2. Turn the crankshaft by hand so that the piston in No.1 cylinder reaches at
TDC: align the TDC notch in the crankshaft pulley with the pro-jection on the
gear case. ...................................................................................................................36
2.3.3. Insert a feeler gauge of a specified thickness and adjust the clearance with
the adjusting screw......................................................................................................36
2.4. INSPECTION AND ADJUSTMENT OF NOZZLE OPENING PRESSUREAND
INJECTION TIMING..........................................................................................................36
2.4.1. Adjustment of the valve opening pressure of the injection nozzles. ...........................36
2.4.2. Inspection of oil tightness of valve seats ....................................................................37
2.4.3. Spraying condition of injection nozzle.........................................................................37
2.4.4. Inspection and adjustment of injection timing.............................................................37
2.5. COMPRESSION AND UNLOADED IDLING SPEEDS.....................................................39
2.5.1. Inspection of compression..........................................................................................39
2.5.2. Inspection and adjustment of the idling speeds..........................................................39
2.6. INSPECTION OF WATER PUMP.....................................................................................39
2.6.1. Inspection of the pump and pulley..............................................................................39
2.6.2. Inspection of the bearing unit......................................................................................40
2.7. INSPECTION OF THERMOSTAT.....................................................................................40
3. ENGINE BODY........................................................................................................................40
3.1. CYLINDER HEAD.............................................................................................................40
3.1.1. REMOVAL OF THE CYLINDER HEAD ......................................................................41
3.1.2. DISASSEMBLY...........................................................................................................42
3.1.3. INSPECTION..............................................................................................................42
3.1.4. DISASSEMBLY AND INSPECTION OF THE ROCKERARM SHAFT .......................45
3.1.5. INSPECTION OF THE PUSH RODS .........................................................................46
3.1.6. INSTALLATION OF THE CYLINDER HEAD...............................................................46
3.2. GEAR CASE.....................................................................................................................48
3.2.1. EXPLODED VIEW......................................................................................................48
3.2.2. REMOVAL OF THE GEAR CASE...............................................................................48
3.2.3. RE-INSTALLATION OF THE GEAR CASE.................................................................49
3.3. CYLINDER BLOCK ..........................................................................................................50
3.3.1. EXPLODED VIEW......................................................................................................50
3.3.2. DISASSEMBLY OF THE CYLINDER BLOCK............................................................51

ISEKI LAWN MOWERS
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3.3.3. INSPECTION OF CYLINDER BLOCK,CRANKSHAFT, CAMSHAFT,
AND TAPPETS............................................................................................................52
3.3.4. INSPECTION OF PISTONSAND CONNECTING RODS..........................................57
3.3.5. ASSEMBLY OF PISTONAND CONNECTING ROD..................................................59
3.3.6. INSTALLATION OF CRANKSHAFT............................................................................60
3.3.7. INSTALLATION OF PISTON/CON-NECTING-RODASSEMBLIES ...........................61
3.3.8. INSTALLATION OF REAR OIL SEAL.........................................................................62
3.3.9. INSTALLATION OF STRAINER AND OIL PAN ..........................................................62
3.3.10. INSTALLATION OF REAR PLATE AND FLYWHEEL...............................................62
3.3.11. INSTALLATION OF FRONT PLATE AND GEARS....................................................63
CHAPTER 5. LUBRICATION SYSTEM..........................................................................................67
1. GENERAL DESCRIPTION ......................................................................................................67
1.1. LUBRICATION DIAGRAM................................................................................................67
1.2. RELIEF VALVE.................................................................................................................68
1.3. OIL FILTER.......................................................................................................................68
1.4. EXPLODED VIEW OF OIL PUMP....................................................................................69
2. REMOVAL, DISASSEMBLY, INSPECTION AND RE-INSTALLATION OF OIL PUMP............70
2.1. REMOVAL OF OIL PUMP.................................................................................................70
2.2. DISASSEMBLY OF OIL PUMP.........................................................................................70
2.3. INSPECTION....................................................................................................................70
2.4. INSTALLATION OF OIL PUMP.........................................................................................71
3. OIL FILTER..............................................................................................................................71
3.1. REMOVAL OF OIL FILTER...............................................................................................71
3.2. INSTALLATION OF OIL FILTER.......................................................................................71
CHAPTER 6. COOLING SYSTEM..................................................................................................73
1. COOLING SYSTEM DIAGRAM...............................................................................................73
2. THERMOSTAT.........................................................................................................................73
2.1. REMOVAL OF THERMOSTAT..........................................................................................73
2.2. INSTALLATION OF THERMOSTAT..................................................................................73
2.3. INSPECTION OF THERMOSTAT.....................................................................................73
3.WATER PUMP..........................................................................................................................74
3.1. REMOVAL OF WATER PUMP..........................................................................................74
3.2. INSTALLATION OF WATER PUMP..................................................................................74
3.3. INSPECTION OF WATER PUMP.....................................................................................74
CHAPTER 7. FUEL SYSTEM.........................................................................................................75
1. INJECTION PUMP CONSTRUCTION.....................................................................................75
2. REMOVAL, DISASSEMBLY, INSPECTION, RE-ASSEMBLY, AND INSTALLATION...............76
2.1. REMOVAL OF INJECTION PUMP...................................................................................77
2.2. DISASSEMBLY OF INJECTION PUMP ...........................................................................77

SERVICE MANUAL FOR SXG323&326
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2.3. INSPECTION....................................................................................................................79
2.4. RE-ASSEMBLY.................................................................................................................79
3. INJECTION NOZZLES AND HOLDERS..................................................................................81
3.1. REMOVAL OF INJECTION NOZZLESAND HOLDERS ..................................................81
3.2. INSPECTION OF INJECTION NOZZLES........................................................................81
3.3. DISASSEMBLY AND WASHING OF INJECTION NOZZLES...........................................82
3.4. INSTALLATION OF INJECTION NOZZLES AND HOLDERS ..........................................83
3.5. INSTALLATION OF INJECTION NOULES AND HOLDERS ............................................83
4. GOVERNOR............................................................................................................................84
4.1. GOVERNOR CONSTRUCTION.......................................................................................84
4.2. GOVERNOR OPERATION...............................................................................................86
CHAPTER 8. TRANSMISSION AND RELATED PARTS ...............................................................87
1. DRIVE TRAIN DIAGRAM ........................................................................................................87
2. TRANSMISSION......................................................................................................................88
3. REAR WHEEL DRIVING MECHANISM (GE type)..................................................................88
4. BRAKE SYSTEM DISASSEMBLY...........................................................................................90
5. PRECAUTIONS FOR REASSEMBLY.....................................................................................90
6. BRAKE ADJUSTMENT............................................................................................................90
7. DIF-LOCK ADJUSTMENT ......................................................................................................91
CHAPTER 9. REAR AXLE .............................................................................................................93
1. CONSTRUCTION....................................................................................................................93
CHAPTER 10. HYDROSTATIC TRANSMISSION..........................................................................95
1. CONSTRUCTION AND NAMES OF MAJOR COMPONENTS ...............................................95
2. OPERATING DIAGRAM OF HST............................................................................................96
3. FUNCTION ..............................................................................................................................97
3.1. VARIABLE TYPE PUMP...................................................................................................97
3.2. FIXED TYPE MOTOR.......................................................................................................98
3.3. VALVES ............................................................................................................................98
4. DISASSEMBLY AND REASSEMBLY ....................................................................................100
4.1. REQUIRED TOOLS........................................................................................................100
4.2. PRECAUTIONS FOR DISASSEMBLY...........................................................................100
4.3. TROUBLESHOOTING....................................................................................................101
4.4. DISASSEMBLY...............................................................................................................103
4.5. CRITERIA FOR REPLACING WORN PARTS................................................................106
4.6. PRECAUTION BEFORE REASSEMBLY .......................................................................107
4.7. REASSEMBLY................................................................................................................107
4.8. PRECAUTIONS FOR REASSEMBLY.............................................................................111
4.9. LIST OF MAJOR COMPONENTS OF HIST................................................................... 113
4.10. PRECAUTIONS FOR INSTALLATION OF HST UNIT..................................................113

ISEKI LAWN MOWERS
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4.11. PRECAUTIONS AFTER INSTALLATION OF HST UNIT..............................................113
5. ADJUSTMENT OF HIST........................................................................................................114
CHAPTER 11. HYDRAULIC SYSTEM ......................................................................................... 117
1. HYDRAULIC SYSTEM DIAGRAMS......................................................................................117
2. INSPECTION OF MAJOR COMPONENTS...........................................................................119
2.1. SUCTION FILTER...........................................................................................................119
2.2. HYDRAULIC PUMP (GEAR PUMP)............................................................................... 119
2.3. RELIEF VALVE FUNCTION............................................................................................ 119
2.4. RELIEF METAL (support)...............................................................................................120
2.5. OIL FILTER (Relief metal (support) ................................................................................120
CHAPTER 12. POWER STEERING SYSTEM .............................................................................121
1. CONSTRUCTION..................................................................................................................121
2. WORKING PRINCIPLE .........................................................................................................122
2.1. When the steering wheel is in neutral position: ..............................................................122
2.2. When the sterrring wheel is operated:............................................................................122
3. MAJOR TROUBLESAND CAUSES, AND COUNTERMEASURES .....................................123
CHAPTER 13. ELECTRICAL ACCESSORIES ............................................................................127
1. ELECTRICAL COMPORNENS AND WIRE HARNESS ........................................................127
2. WIRING DIAGRAM (E TYPE)................................................................................................129
3. WIRING DIAGRAM (GE TYPE).............................................................................................130
4. STARTER ..............................................................................................................................131
4.1. CONSTRUCTION...........................................................................................................131
4.2. REMOVALAND DISASSEMBLY OF STARTER.............................................................132
4.3. INSPECTION OF COMPONENTS.................................................................................132
4.4. REASSEMBLY OF STARTER ........................................................................................135
4.5. INSPECTION OF THE STARTERAFTER REMOVAL FROM THE TRACTOR .............136
4.6. PERFORMANCE TEST..................................................................................................136
4.7. INSTALLATION OF THE STARTER...............................................................................137
5. ALTERNATOR........................................................................................................................138
5.1. EXPLOTED VIEW, SPECIFICATIONS, AND PERFORMANCE CURVES.....................138
5.2. TROUBLESHOOTING....................................................................................................139
5.3. REMOVALAND DISASSEMBLY....................................................................................139
5.4. INSPECTION..................................................................................................................141
5.5. RE-ASSEMBLY...............................................................................................................144
6. GLOW PLUGS.......................................................................................................................145
6.1. SECTIONAL VIEW .........................................................................................................145
6.2. REMOVAL, INSPECTION, AND RE-ASSEMBLY...........................................................146

SERVICE MANUAL FOR SXG323&326
10

CHAPTER 1. GENERAL INFORMATION
11
1
CHAPTER 1. GENERAL INFORMATION
1.MODEL NAME AND IDENTIFICATIONS NUMBERS
a.Model name plate
The model name plate, which gives the model
name, type, production serial number, and pro-
duction year of the machine, is located on the
right-hand side of the chassis.
Fig. 1-1
(1) Model
(2) Type
(3) Production serial number
(4) Production year
Fig. 1-2
(A) Model name plate
(B) Engine plate
(C) Punched model name and serial number on
the right side of the chassis
SXG323 H000001
b.Engine model name and serial number
• The engine name is cast into the left-hand side
wall of the cylinder block.
• The serial number is punched into the left-hand
side wall of the cylinder block.
Fig. 1-3
(1) Model
(2) Displacement
(3) Production serial number
1
2
3 4
SXG323H
E42
510kg
14.0kW/2600min-1
C
Chassis production serial number
Manufacturer’s model name
112
123
1
2
3

SERVICE MANUAL FOR SXG323&326
12
Model SXG 326 H SXG 323 H
E42 GE42 E42 GE42
Dimensions Overall length 2110 mm (83.1 in.)
Overall width 1170 mm (46.1 in.) 1100 mm (43.3 in.)
Overall height 1320 mm (52 in.) 1290 mm (50.8 in.)
Weight 525 kg (1157
lb.) 530 kg (1168 lb.) 510 kg (1124 lb.) 515 kg (1135 lb.)
Engine Model E3112-G07 E3112-G06
Type Vertical, Water-cooled, 4-cycle, diesel
Combustion
chamber Swirl chamber type
No, of cylinders 3
Total
displacement 1123
Output (net) 15.4 kw (21ps)
2600 min-1 (rpm) 14.0 kw (19 ps) 2600 min-1 (rpm)
Fuel Diesel fuel
Fuel tank Capacity 21 liters (4.6 imp. gal.)
Transmission Main
transmission HST (Hydrostatic transmission)
Rear axle Chain drive
Travel Forward 0-16.5 km/h (0-10.3 mph) 0-14.5 km/h (0-9 mph)
Speeds Reverse 0-10 km/h (0-6.3 mph)
Wheel base 1450 mm (57.1 in.) 1365 mm (53.7 in.)
Wheel Tread Front 930 mm (36.6 in.) 910 mm (35.8 in.)
Rear 860 mm (33.9 in.)
Driving
system 2WD
Steering
system Power steering
Brake system Dry internal-shoe expanding
No. of Brake 1 (Before dif.) 2 (After dif.) 1 (Before dif.) 2 (After dif.)
Tyre size Front 18 x 8.50-8 16 x 6.5-8
Rear 26 x 10.50-12 23 x 10.50-12
PTO Front 1750 min-1 (rpm)
PTO Clutch Belt tension clutch
Minimum
ground Lawn mower 140 mm (5.5 in.) 110 mm (4.3 in.)
clearance Mower lift 150 mm (5.9 in.) 130 mm (5.1 in.)
2. SPECIFICATIONS
LAWN MOWER

CHAPTER 1. GENERAL INFORMATION
13
1
3. EXTERIOR VIEW
Fig. 1-4

SERVICE MANUAL FOR SXG323&326
14
4. PERIODIC INSPECTION TABLE
c: Inspection, replenishment, and adjustment U:Cleaning and washing
z:Replacement :Consult your dealer.
Check points
Pre-
operation
Inspection and servicing intervals
hours of operation Intervals after that Judgement criteria
50 100 150 200 250 300 350 400
Engine oil czz
Replace after initial 50 h
and then every 100 h. Maintain the specified level.
Air cleaner UUUUUUUU Clean after every 50h.
Engine coolant cReplace every year. Maintain the specified level.
Fuel cKeep fuel tank always full.
Fuel strainer cUUzU
Clean after every 100h.
Replace element after
every 300h.
There should be no dust or
water in filter.
Fan belt c13.8~14.8mm
(0.54~0.58 in.) deflection
Electrolyte level cccccccc Inspect after every 50h.
Level should be kept properly.
Engine oil filter 
Replace after initial 50h.
Replace after every 300h.
Transmission oil c
Replace after initial 50h
and then after every 200h. Maintain the specified level.
Hydraulic oil filter 
Replace after initial 50h.
and then replace after every 200h.
Suction filter 
Clean after initial 50h.
and then replace after every 200h.
Chain case 
Replace after initial 50h
and then after every 200h. maintain the specified level
Brake pedal play c20 to 30 mm (0.8 to 1.2h.)
Steering wheel cCheck after every 300h.
There should be no abnormality.
Ball joints of steering
system linkage
cCheck after every 300h. Loose ball joints should be
re-tightened.
Tire pressure c
SXG326
Front: 1.5 x 105Pa (22psi)
Rear: 1.4 x 105Pa (20psi)
SXG323
Front: 1.4 x 105Pa (20psi)
Rear: 1.9 x 105Pa (28psi)
Toe-in Adjust after every 300h. 1 to 5mm(0.04 to 0.20in.)
Wheel tightening nuts
c
There should be no loose nuts.
Grease-up cccccccc Inject grease after every 50h.
Radiator screen U
There should be no clogging.
Radiator U There should be no clogging.
Electrical apparatus cAll should work properly.
Safety switches cAll should work properly.
Air intake openings UAll should work properly.
Bolts and nuts c There should be no loose ones.
Rubber pipes cccc Check after every 100h.
IMPORTANT: • Above mentioned service intervals should be used as reference creteria. If working conditions are
harder, earlier service is recommended.
• When special technology and special tools are required, consult your dealer.

CHAPTER 1. GENERAL INFORMATION
15
1
5. FILLING DIAGRAM
Fig. 1-5
Ref.No Filling points Lubricants Quantity: litre (imp.gal)
1Radiator LLC50% 3.5 (0.77)
Reserve tank 0.6 (0.13)
2 Engine Engine Oil 2.6 (0.57)
3 Transmission case HST OIL(SHELLDONAX TD) 8.0 (1.76)
4 Chain case (RH) Gear oil (SAE80) 1.1 (0.24)
5 Chain case (LH) Gear oil (SAE80) 1.1 (0.24)
6 Centre pivot Grease As required
7 Knuckle arms Grease As required
8 Cylinder ball end Grease As required
9 HST pedal hub Grease As required
10 Brake shaft Grease As required
11 HST link hub Grease As required
12 Brake shaft
ÚOnly G type Grease As required
13 Mower link Grease As required
14 Fuel tank Diesel fuel 21 (4.62)
Oil fillers
Oil drains
Greasing points
8 7 6 2 7
12
8
3
13
5
14
1
12
9
9
10
13
4
11


SERVICE MANUAL FOR SXG323&326
16

CHAPTER 2. DISASSEMBLY OF MAJOR COMPONENTS
17
2
1. GENERAL PRECAUTIONS FOR SEPARATION AND REINSTALLATION
1.1. BEFORE OPERATION
a. Always be safety-conscious in selecting clothes
to wear and suitable tools to use.
b. Before disassembly, be sure that you familiarize
yourself with the assembled condition for
subsequent reference in reassembly.
c. Keep parts and tools in proper order during
operations.
d. When servicing electrically live parts, be sure to
disconnect the negative battery terminal.
e. To prevent oil or water leaks, use the liquid
gasket as required.
f. When reassembling disassembled parts, discard
used gaskets, O-rings, or oil seals and install new
ones.
g. When lifting up only the front or rear part of the
tractor, be sure to wedge the grounded wheels.
h. When the tractor is jacked up, be sure to support
the entire tractor with something like a stand.
Lifting it up with a jack only is a dangerously
unstable procedure.
i. When replacing parts, use authorized, genuine
ISEKI parts only. ISEKI assumes no responsibility
for accidents, operating problems or dam-age
caused by the use of imitation parts. Also, the use
of unauthorized parts will result in relatively poor
machine performance.
1.2. PRECAUTIONS TO BE FOLLOWED WHEN
INSTALLING COMMON PARTS
a. Roller or ball bearings
• When a bearing is fitted in by the outer race, use an
installer which is specially designed to push only the
outer race and vice versa.
• The installer must be designed to install the bearing
on the shaft in a parallel position.
•When installing a bearing which appears the same on
both sides, install it so that the face which has the
identification number faces in a direction for easy
visual identification. All the bearings which are to be
installed in the transmission case should be placed so
that their identification number faces outward.
• If a shaft or a hole where a bearing is to be installed
has a stopper, the bearing should be pushed in
completely until it is seated against the stopper.
• Installed bearings should turn smoothly.
b. Oil seals
• Oil seal installer should be designed so as not to
deform the oil seals.
• During installation, be careful not to damage the lips,
and assure that it is pushed in parallel to the shaft or
hole.
• When oil seals are installed, there should be no
turnover of the lips nor dislocation of the springs.
• When a multi-lip seal is installed, the grooves
between lips should be filled with grease, not
adhesive.
• Use a lithium-based grease.
• There should be no oil or water leaks through the
installed soil seals.
CHAPTER 2. DISASSEMBLY OF MAJOR COMPONENTS

SERVICE MANUAL FOR SXG323&326
18
c. O-rings
• O-rings should be coated with grease before
installing.
• Installed O-rings should have no slack or twist.
• Installed O-rings should maintain proper air
tightness.
d. Snap-rings
• Snap-ring installers should be designed so as not
to permanently deform the snap-rings.
• Installed snap-rings should be seated securely in
the groove.
• Be careful not to overload the snap-ring to the
extent that it is permanently deformed.
•How to install the snap-ring:
When installing a snap-ring, install it as shown in
the figure with its round edge side turned toward
the part to be retained. This round edge is formed
when the snap-ring is pressed out.
Fig. 2-1
e. Spring (roll) pins
• Spring pins should be driven in properly and
tightly.
• Spring pins should be installed so that their
seams should face the direction from which the
load is applied.
Fig. 2-2
• The roll pins installed in the transmission or other
parts where much force is applied should be retained
with wire.
f. Cotter pins(Split pin)
•When installed, cotter pins should be bent securely at
the ends as shown in the figure.
Fig. 2-3
g. Bolts and nuts
• Special bolts are installed at several locations, so be
sure not to interchange them other bolts.
• Bolts and nuts should be tightened to their specified
torque with a torque wrench.
• When locking the bolts or nuts with wire or a lock
washer, be sure to wind the wire paying sufficient
attention to its winding direction and bend the lock
washer for secure locking.
• When locking bolts and nuts with an adhesive, apply
the adhesive on the thread and tighten securely.
•Apply an adhesive (THREE BOND TB1104) to parts
through which there is any possibility of oil leaks,
such as stud bolts and tapped-through parts.
• Each lock nut must be tightened securely.
• When tightening bolts and nuts, refer to the tightening
torque table.
h. After installation, each grease fitting should
be filled with grease.
• When installing grease fittings of types B and C, be
sure to turn the fitting tips in a direction that will
provide easy access for a grease gun.

CHAPTER 2. DISASSEMBLY OF MAJOR COMPONENTS
19
2
i. Other precautions
• Be sure not to damage any finished surfaces or
parts.
•Always refrain from forcing installation.
• Each lever knob should be installed coated
with an adhesive (SUPER THREE CEMENT
TB1702)
• Each contact surface should be coated with an
adhesive (THREE BOND TB1215) and
tightened evenly with bolts. Adhesive coated
surfaces should be installed within 30 minutes
after application of the adhesive.
The contact surfaces should be flawless and
free from foreign matter and especially from
grease before application of the adhesive.
- Contact surfaces of the sleeve metal (support)
and front transmission case
- Contact surfaces of the hydraulic control leve
guide and cylinder case
• Precautions for applying adhesives
- The surface or the thread where an adhesive
is to be applied should be completely free of
chips and oil.