Case IH DX23 Operating instructions

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87367153 8/05
©2005 CNH America LLC
Printed In U.S.A.
DX23, DX26
REPAIR MANUAL
COMPLETE CONTENTS
SECTION 00 - GENERAL INFORMATION 2..............................
SECTION 10 - ENGINE 3..............................................
SECTION 18 - SINGLE CLUTCH 10......................................
SECTION 21 - TRANSMISSION 11.......................................
SECTION 25 - FWD FRONT AXLE 13....................................
SECTION 27 - DIFFERENTIAL, REAR AXLE 14...........................
SECTION 29 - HYDROSTATIC TRANSMISSION 15........................
SECTION 31 - POWER TAKE-OFF (PTO) 19..............................
SECTION 33 - BRAKES 20..............................................
SECTION 35 - HYDRAULIC SYSTEM 21..................................
SECTION 41 - STEERING 24............................................
SECTION 44 - WHEELS AND TIRES 25..................................
SECTION 55 - ELECTRICAL SYSTEM 26.................................
SECTION 90 - PLATFORM 32...........................................
The following pages are the collation of the contents pages from each section and
chapter of the DX23, DX26 Repair manual. Complete Repair part # 87367148.
The sections used through out all Case IH product Repair manuals may not be used for
each product. Each Repair manual will be made up of one or several books. Each book
will be labeled as to which sections are in the overall Repair manual and which sections
are in each book.
The sections listed above are the sections utilized for the DX23, DX26 Tractors.
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2
SECTION 00 - GENERAL INFORMATION
BOOK 1 - 87367149
Chapter 1 - General Information
CONTENTS
Section Description Page
Introduction 2...................................................................
Precautionary Statements 3.......................................................
Safety 4........................................................................
The Tractor 4....................................................................
Servicing the Tractor 4............................................................
Operating the Tractor 5...........................................................
Driving the Tractor 5..............................................................
Operating the PTO 6.............................................................
Diesel Fuel 6....................................................................
Safety Frame (ROPS) 6..........................................................
Safety Decals 7..................................................................
Instruction Decals 9..............................................................
Product Identification Plate 13....................................................
Universal Symbols 14...........................................................
Specifications -- DX23, DX26 15..................................................
General Dimensions -- DX23, DX26 20.............................................
Minimum Hardware Tightening Torques 23.........................................
Lubricants 25...................................................................
Adjustments 26.................................................................
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3
SECTION 10 - ENGINE
BOOK 1 - 87367149
Chapter 1 - Engine Systems
CONTENTS
Section Description Page
10 000 Specifications 6..................................................................
Cylinder Head 6..............................................................
Cylinder Block 7..............................................................
Piston 7.....................................................................
Piston Ring 8................................................................
Connecting Rod 8............................................................
Crankshaft 9.................................................................
Camshaft 10................................................................
Valves 11....................................................................
Push Rods 12...............................................................
Rocker Arms 12.............................................................
Lubrication System 12........................................................
Cooling System 13...........................................................
Torque Specifications 14.........................................................
Metric Bolt Torque Specifications 14...............................................
Special Tools 15................................................................
Description and Operation -- General Information 16.................................
Identification Chart 16........................................................
Cylinder Head and Valve Train Components 17..................................
Cylinder Block Assembly 17...................................................
Troubleshooting 19..............................................................
Overhaul -- Engine 25...........................................................
Engine Preparation 25.......................................................
Disassembly 25..........................................................
Fuel Injector and Glow Plug 27................................................
Removal 27.............................................................
Oil Pressure Switch 27.......................................................
Removal 27.............................................................
Temperature Sending Switch and Alternator 28..................................
Removal 28.............................................................
Fan, Water Pump, and External Oil Tube 28.....................................
Removal 28.............................................................
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4
SECTION 10 - ENGINE
BOOK 1 - 87367149
Chapter 1 - Engine Systems (Continued)
CONTENTS
Section Description Page
Valve Cover 28..............................................................
Removal 28.............................................................
Rocker Shaft and Push Rod 29................................................
Removal 29.............................................................
Cylinder Head 29............................................................
Removal 29.............................................................
Valve Tappet 29.............................................................
Removal 29.............................................................
Fuel Shut-off Solenoid 30.....................................................
Removal 30.............................................................
Engine Timing Gear Cover 30.................................................
Removal 30.............................................................
Timing Gears and Camshaft 32................................................
Removal 32.............................................................
Oil Sump 32................................................................
Removal 32.............................................................
Oil Suction Pipe and Strainer 33...............................................
Removal 33.............................................................
Connecting Rods, Bearing and Pistons 33......................................
Removal 33.............................................................
Flywheel 34.................................................................
Removal 34.............................................................
Backplate and Oil Seal 34....................................................
Removal 34.............................................................
Crankshaft and Main Bearing 34...............................................
Removal 34.............................................................
18 110 Cylinder Head 35............................................................
Disassembly 35..........................................................
Inspection 35............................................................
Valve Seats 36..............................................................
Inspection 36............................................................
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5
SECTION 10 - ENGINE
BOOK 1 - 87367149
Chapter 1 - Engine Systems (Continued)
CONTENTS
Section Description Page
Valves 37...................................................................
Inspection 37............................................................
Valve Guides 39.............................................................
Inspection 39............................................................
Valve Springs 39............................................................
Inspection 39............................................................
Rocker Arms 40.............................................................
Inspection 40............................................................
Push Rods 40...............................................................
Inspection 40............................................................
Cylinder Head 41............................................................
Assembly 41............................................................
Cylinder Block 41............................................................
Inspection 41............................................................
10 105 Pistons, Piston Rings, and Connecting Rods 42..................................
Disassembly 42..........................................................
Piston 42...................................................................
Inspection 42............................................................
Piston Rings 44.............................................................
Inspection 44............................................................
Connecting Rods 45.........................................................
Inspection 45............................................................
Bearing Oil Clearance Check 47............................................
10 105 Pistons, Piston Rings, and Connecting Rod 47...................................
Assembly 47............................................................
10 103 Crankshaft Main Bearings 48..................................................
Removal 48.............................................................
Inspection 48............................................................
Crankshaft 49...............................................................
Inspection 49............................................................
Crankshaft Journal Wear Limit and Bearing Usage 49............................
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6
SECTION 10 - ENGINE
BOOK 1 - 87367149
Chapter 1 - Engine Systems (Continued)
CONTENTS
Section Description Page
Crankshaft Front Main Bearing (Bushing) 50....................................
Inspection 50............................................................
Replacement 50.........................................................
Crankshaft Main Bearing 51...................................................
Assembly 51............................................................
Port Block 51...............................................................
Removal 51.............................................................
Installation 51............................................................
Timing Gear 52..............................................................
Inspection 52............................................................
Camshaft 52................................................................
Disassembly 52..........................................................
Inspection 53............................................................
Assembly 53............................................................
10 103 Flywheel 54.................................................................
Inspection 54............................................................
Timing Gear Housing 54......................................................
Front Oil Seal and Steering Pump Seal 54......................................
Replacement 54.........................................................
Crankshaft and Bearing Holder 55.............................................
Assembly 55............................................................
Rear Oil Seal and Backplate 55................................................
Assembly 55............................................................
Flywheel 56.................................................................
Installation 56............................................................
Piston and Connecting Rod 56................................................
Installation 56............................................................
Oil Suction Pipe and Suction Strainer 57........................................
Installation 57............................................................
Oil Sump 57................................................................
Installation 57............................................................
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7
SECTION 10 - ENGINE
BOOK 1 - 87367149
Chapter 1 - Engine Systems (Continued)
CONTENTS
Section Description Page
Camshaft and Camshaft Gear 57..............................................
Assembly 57............................................................
Idler Gear, Oil Pump and Injection Timing 58....................................
Installation 58............................................................
Timing Gear Cover 58........................................................
Installation 58............................................................
Crankshaft Pulley 58.........................................................
Installation 58............................................................
Fuel Injection Pump 59.......................................................
Installation 59............................................................
Power Steering Pump 59.....................................................
Installation 59............................................................
Head Gasket 60.............................................................
Cylinder Head 61............................................................
Assembly 61............................................................
Valve Clearance Adjustment 62................................................
Valve Cover 62..............................................................
Installation 62............................................................
Fan, Water Pump and External Oil Tube 63.....................................
Installation 63............................................................
Glow Plug and Connector 63..................................................
Installation 63............................................................
Fuel Injector 63.............................................................
Installation 63............................................................
Fuel Piping 64...............................................................
Installation 64............................................................
Alternator and Temperature Sending Switch 64..................................
Installation 64............................................................
Exhaust Manifold, Radiator, and Air Cleaner 65..................................
Installation 65............................................................
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8
SECTION 10 - ENGINE
BOOK 1 - 87367149
Chapter 1 - Engine Systems (Continued)
CONTENTS
Section Description Page
Description of Operation -- Engine Lubrication System 66.............................
10 206 Engine Oil Filter 69..........................................................
10 304 Oil Pump 69................................................................
Removal 69.............................................................
Inspection 69............................................................
Installation and Adjustment 70.............................................
Engine Oil Pressure Check 71.................................................
Oil Pressure Relief Valve 71...................................................
Removal 71.............................................................
Installation 71............................................................
Oil Consumption 72..........................................................
10 400 Description of Operation -- Cooling System 73......................................
Maintenance 75................................................................
Coolant 75..................................................................
Thermostat 75..............................................................
Water Pump 75.............................................................
Cooling Fan 75..............................................................
Radiator 75.................................................................
Radiator Cap 75.............................................................
Overhaul -- Cooling System 76....................................................
10 406 Radiator 76.................................................................
Removal 76.............................................................
Inspection and Repair 77..................................................
Installation 77............................................................
10 402 Water Pump and Thermostat 78...............................................
Removal 78.............................................................
Inspection and Repair 80..................................................
Assembly 80............................................................
Installation 80............................................................
Compression Test and Tools 82................................................
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9
SECTION 10 - ENGINE
BOOK 1 - 87367149
Chapter 2 - Fuel System
CONTENTS
Section Description Page
Specifications 2..................................................................
10 242 Description and Operation -- Injection Pump 3........................................
10 236 Pumping Elements 5..........................................................
10 214 Delivery Valves 5.............................................................
Troubleshooting -- General 8......................................................
Troubleshooting -- Fuel Injectors 11.................................................
Troubleshooting -- Governor 12...................................................
Troubleshooting -- Engine Breather Valve 13........................................
Injection Pump 14...........................................................
10 214 Removal 14.............................................................
Installation 14............................................................
Timing and Governor Adjustments 15..............................................
10 230 Installation Using Original Pump and Drive Components 15........................
Install a New Pump or Drive Component 15.....................................
Spill-timing Procedure 16.....................................................
Bleeding the Fuel System 20..................................................
Full Screw/High Idle Adjustment 20............................................
10 230 Description of Operation -- Governor 21...........................................
Governor 23................................................................
Disassembly 23..........................................................
Assembly 24............................................................
Adjustments 25..........................................................
10 218 Description and Operation -- Injectors 26...........................................
Injector 27..................................................................
Removal 27.............................................................
Disassembly 28..........................................................
Assembly and Adjustment 28..............................................
Engine Breather Valve 29.....................................................
Removal 30.............................................................
Installation 30............................................................
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10
SECTION 18 - SINGLE CLUTCH
BOOK 1 - 87367149
Chapter 1 - Single Clutch
CONTENTS
Section Description Page
Specifications 2..................................................................
Special Tools 3..................................................................
Description and Operation -- General Information 4...................................
Troubleshooting 5................................................................
Single Clutch 3...............................................................
Free Play Adjustment 3....................................................
Separating the Tractor Between the Engine and Clutch Housing --
9 x 3 Transmission 7..........................................................
Disassembly 7............................................................
Removal 16.............................................................
Installation 16............................................................
Assembly 18............................................................
Description and Overhaul -- Servicing Clutch-Related Components 26..................
18 110 Clutch Pilot Bearing -- 9 x 3 Gear Transmission Only 26...........................
Removal 26.............................................................
Inspection 26............................................................
Installation 26............................................................
Clutch Release Bearing 27....................................................
Removal 28.............................................................
Inspection 29............................................................
Assembly 29............................................................
Flywheel Dimensions 30......................................................
Clutch Cross Shaft Bushings 30...............................................
Removal 30.............................................................
Assembly 30............................................................
Clutch Pedal Bushings 31.....................................................
Removal 31.............................................................
Assembly 31............................................................
Clutch Linkage Adjustment 32....................................................

11
SECTION 21 - TRANSMISSION
BOOK 2 - 87367150
Chapter 1 - Transmission Systems
CONTENTS
Section Description Page
Introduction 3...................................................................
Description and Operation -- 9 x 3 Gear Transmission 4...............................
9 x 3 Gear Transmission -- Power Flow 5........................................
Overhaul 11.....................................................................
Transmission Preparation 11...................................................
Separating the Tractor -- Between the Clutch Housing and the Rear Transmission
– 9 x 3 Transmission 12......................................................
Removal 12.............................................................
Transmission Shift Cover 16..................................................
Disassembly 18..........................................................
Assembly 22............................................................
Input Shaft, Idler Gear and Countershaft Gear 26................................
Removal 26.............................................................
Main Shaft 27...............................................................
Removal 27.............................................................
Front Wheel Drive Shaft 28...................................................
Removal 28.............................................................
Countershaft 29.............................................................
Removal 29.............................................................
Range and Rear PTO Shift Rail and Fork 30.....................................
Removal 30.............................................................
Pinion Shaft 31..............................................................
Removal 31.............................................................
PTO Front Countershaft 32...................................................
Removal 32.............................................................
Mid-Mount PTO Idler Shaft 33.................................................
Removal 33.............................................................
Mid-Range Gear Case 34.....................................................
Disassembly 34..........................................................
Inspection 34............................................................
Assembly 35............................................................

12
SECTION 21 - TRANSMISSION
BOOK 2 - 87367150
Chapter 1 - Transmission Systems (Continued)
CONTENTS
Section Description Page
Mid-Mount PTO Idler Shaft 36.................................................
Assembly 36............................................................
PTO Front Countershaft 36...................................................
Assembly 36............................................................
Rear PTO Countershaft 37....................................................
Assembly 37............................................................
Pinion Shaft 38..............................................................
Installation 38............................................................
Shift Rail and Fork 39........................................................
Installation 39............................................................
Countershaft 40.............................................................
Assembly 40............................................................
Front Wheel Drive Shaft 41...................................................
Assembly 41............................................................
Front Wheel Drive Shift Cover 41..............................................
Assembly 41............................................................
Main Shaft 42...............................................................
Assembly 42............................................................
Input Shaft, Idler Gear and Countershaft Gear 43................................
Assembly 43............................................................
Reconnecting the Tractor -- Between the Clutch Housing and the
Rear Transmission -- 9 x 3 Transmission 44.....................................
Installation 44............................................................

13
SECTION 25 - FWD FRONT AXLE
BOOK 2 - 87367150
Chapter 1 - FWD Front Axle
CONTENTS
Section Description Page
Specifications 2..................................................................
Front Wheel Drive 2..........................................................
Metric Bolt Torque Specifications 3.................................................
25 100 Description and Operation -- Front Axle - Front Wheel Drive 4..........................
Troubleshooting 5................................................................
Front Axle 5.................................................................
Overhaul 6......................................................................
Front-Wheel Drive Front Axle 6.................................................
Removal 6...............................................................
25 108 Front Axle 7.................................................................
Disassembly 7............................................................
25 102 Differential 9.................................................................
Disassembly 9............................................................
Inspection 9..............................................................
Axle 9.......................................................................
Inspection 9..............................................................
Differential 11................................................................
Assembly 11.............................................................
Pinion 11....................................................................
Assembly 11.............................................................
Ring Gear to Pinion Backlash Check (Using Original Components) 13...........
Ring Gear to Pinion Backlash Check (Using New Components) 14..............
Shim Calculation - Alternate Method 15.....................................
Pinion-To-Ring Gear Tooth Contact Adjustment 16............................
Front-Wheel Drive Front Axle 17...............................................
Installation 17............................................................
Final Pinion and Wheel Shaft 17...............................................
Backlash Adjustment 17...................................................

14
SECTION 27 - DIFFERENTIAL, REAR AXLE
BOOK 2 - 87367150
Chapter 1 - Differential, Rear Axle
CONTENTS
Section Description Page
Specifications 2..................................................................
Metric Bolt Torque Specifications 3.................................................
Special Tools 3..................................................................
27 106 Description and Operation -- General Information 4...................................
Differential 4.................................................................
27 110 Differential Lock 5............................................................
27 126 Rear Axle and Brakes 6.......................................................
Overhaul 10....................................................................
27 106 Differential 10...............................................................
Removal 10.............................................................
Drive Pinion 12..............................................................
Removal 12.............................................................
Differential 13...............................................................
Disassembly 13..........................................................
Inspection 13............................................................
Assembly 14............................................................
Rear Axle and Brakes 18.....................................................
Rear Axle Disassembly 18.................................................
Inspection 18............................................................
Rear Axle Assembly 18...................................................
27 110 Differential Lock 20..........................................................
Disassembly 20..........................................................
Assembly 21............................................................
Ring Gear and Pinion Gear Pattern Adjustment 22...............................

15
SECTION 29 - HYDROSTATIC TRANSMISSION
BOOK 2 - 87367150
Chapter 1 - Hydrostatic Transmission
CONTENTS
Section Description Page
Specifications 5..................................................................
Metric Bolt Torque Specifications 7.................................................
Special Tools 8..................................................................
29 202 Description and Operation -- Hydrostatic Transmission 9..............................
29 212 Variable Displacement Pump 11................................................
29 212 Fixed Displacement Motor 12..................................................
Fluid Flow 13...............................................................
Neutral Position 13.......................................................
Forward Position 14......................................................
Reverse Position 15......................................................
Troubleshooting 16..............................................................
Overhaul -- Hydrostatic Transmission 17...........................................
Transmission Preparation 17..................................................
Separation between the Clutch Housing and the Extension Housing --
the Extension Housing and Rear Transmission 18................................
29 202 Hydrostatic Unit 22..........................................................
Removal 22.............................................................
Precautions Before Disassembly 26............................................
Motor and Port Block 26......................................................
Disassembly 26..........................................................
Hydrostatic Motor 28.........................................................
Disassembly 28..........................................................
Hydrostatic Motor Shaft 30....................................................
Disassembly 30..........................................................
Charge Pump 30............................................................
Disassembly 30..........................................................
Swash Plate 31.............................................................
Disassembly 31..........................................................
Inspection 33............................................................
Swash Plate/Charge Pump 36.................................................
Assembly 36............................................................

16
SECTION 29 - HYDROSTATIC TRANSMISSION
BOOK 2 - 87367150
Chapter 1 - Hydrostatic Transmission (Continued)
CONTENTS
Section Description Page
HST Piston Pump Cylinder Block 37............................................
Assembly 37............................................................
HST Motor Cylinder Block 39..................................................
Assembly 39............................................................
29 130 Port Block 40...................................................................
Neutral and Feed Valves 40...................................................
Disassembly 40..........................................................
Inspection 40............................................................
Assembly 41............................................................
Charge Pump Relief Valve 41.................................................
Disassembly 41..........................................................
Inspection 41............................................................
High Pressure Relief Valve 42.................................................
Removal 42.............................................................
Installation 42............................................................
Hydrostatic Pump and Port Block 42...........................................
Assembly 42............................................................
Motor and Port Block 44......................................................
Assembly 44............................................................
29 204 Check Valve 45.............................................................
Disassembly 45..........................................................
Inspection 45............................................................
Assembly 45............................................................
Installation of the Clutch Housing and the Extension Housing --
the Extension Housing and Rear Transmission 46................................
Pressure Tests 51...............................................................
High Pressure Relief Valve 51.................................................
Charge Pump (Low) Pressure Relief Valve 52...................................
Description and Operation -- Gearbox 54...........................................
29 300 Gearbox 54.................................................................

17
SECTION 29 - HYDROSTATIC TRANSMISSION
BOOK 2 - 87367150
Chapter 1 - Hydrostatic Transmission (Continued)
CONTENTS
Section Description Page
Overhaul -- Gearbox 57..........................................................
Gearbox 57.................................................................
Removal 57.............................................................
Separation between the Clutch Housing and the Extension Housing --
the Extension Housing and Rear Transmission 57................................
Transmission Drive Shaft and PTO Input Shaft 61................................
Removal 61.............................................................
Main Bearing Holder Plate 62.................................................
Removal 62.............................................................
Main Shaft 63...............................................................
Removal 63.............................................................
FWD Drive Shaft (FWD Model only) 63.........................................
Removal 63.............................................................
Countershaft 65.............................................................
Removal 65.............................................................
Range and Rear PTO Shift Rail and Fork 66.....................................
Removal 66.............................................................
Pinion Shaft 67..............................................................
Removal 67.............................................................
PTO Front Countershaft 68...................................................
Removal 68.............................................................
Mid-Mount PTO Idler Shaft 69.................................................
Removal 69.............................................................
Inspection 69............................................................
Shift Rail and Fork 70........................................................
Installation 70............................................................
Mid-Mount PTO Idler Shaft 71.................................................
Assembly 71............................................................
PTO Front Countershaft 72...................................................
Assembly 72............................................................
Pinion Shaft 73..............................................................
Installation 73............................................................

18
SECTION 29 - HYDROSTATIC TRANSMISSION
BOOK 2 - 87367150
Chapter 1 - Hydrostatic Transmission (Continued)
CONTENTS
Section Description Page
Countershaft 73.............................................................
Assembly 73............................................................
FWD Shaft (FWD Models only) 74.............................................
Assembly 74............................................................
Main Shaft 75...............................................................
Assembly 75............................................................
Input Shaft, Transmission Drive Shaft and Retaining Plate 75......................
Assembly 75............................................................
Front Wheel Drive Shift Cover 77..............................................
Assembly 77............................................................
Installation of the Clutch Housing and the Extension Housing --
the Extension Housing and Rear Transmission 78................................
Overhaul and Adjustments -- Control Linkage 83....................................
29 200 Control Linkage 83...........................................................
Initial Adjustments 84............................................................
Control Rod 84..............................................................
Pedal Stop 84...............................................................
HST Neutralizer 85..........................................................
Removal 85.............................................................
Disassembly 86..........................................................
Inspection 87............................................................
Assembly 88............................................................
Installation 89............................................................
HST Neutral Adjustment 90...................................................
Linkage Damper 91..........................................................
Removal 91.............................................................
Pedal 92...................................................................
Removal 92.............................................................
Pedal Pivot Shaft 94.........................................................
Removal 94.............................................................
Damper, Pivot Shaft, Pedal and FWD Drive Shaft 95..............................
Assembly 95............................................................

19
SECTION 31 - POWER TAKE-OFF (PTO)
BOOK 3 - 87367151
Chapter 1 - Power Take-Off (PTO)
CONTENTS
Section Description Page
Specifications 3..................................................................
Rear PTO 3.................................................................
Mid-Mount PTO 3............................................................
Metric Bolt Torque Specifications 4.................................................
Description and Operation -- PTO System 5.........................................
31 110 9 x 3 Gear Transmission 5.....................................................
31 110 Hydrostatic Transmission 6....................................................
Overhaul -- Rear PTO 7...........................................................
31 114 9 x 3 Rear PTO Output Shaft 7.................................................
Removal 7...............................................................
Inspection 7..............................................................
Assembly 8..............................................................
HST Rear PTO Output Shaft 9.................................................
Removal 9...............................................................
Inspection 9..............................................................
Assembly 10............................................................
Description and Operation -- Mid-Mount PTO 11......................................
Mid-Mount Power Take-Off 11..................................................
Overhaul -- Mid-Mount PTO 13....................................................
31 120 9 x 3 Optional Mid-Mount PTO 14..............................................
Gearbox and Countershaft 14.................................................
Removal 14.............................................................
Output Shaft 14.............................................................
Removal 14.............................................................
Inspection 15............................................................
Assembly 15............................................................
Gearbox and Countershaft 15.................................................
Assembly 15............................................................
Hydrostatic Transmission, Standard Mid-Mount PTO 17...........................
Gearbox and Countershaft 17.................................................
Removal 17.............................................................