New Holland TC25 TC25D Tractor Service Repair Shop Manual Workshop

INDEX SECTION 1 . ENGINE SYSTEMS Air inlet manifold removal ................... 1-9 Fuel injector assembly .................... 1-43 Air intake manifold assembly ............... 1-42 Fuel injector removal ....................... 1-6 Alternator assembly ....................... 1-44 Fuel piping .............................. 1-44 Alternator removal ......................... 1-7 Fuel shutoff solenoid removal .............. 1-10 Backplate and oil seal ..................... 1-15 General information ........................ 1-2 Backplate assembly ...................... 1-35 Glow plug assembly ...................... 1-43 Bolt torque values ........................ 1-82 Glow plug removal ......................... 1-6 Camshaft ................................ 1-11 Head gasket selection ..................... 1-40 Camshaft assembly ................. 1-33, 1-38 Idler gear assembly ....................... 1-38 Camshaft disassembly .................... 1-33 Injection timing ........................... 1-38 Camshaft inspection ...................... 1-33 Main bearing and thrust washer removal Camshaft removal ........................ 1-13 and inspection ........................ 1-29 Compression test and tools ................ 1-84 Main bearings removal .................... 1-15 Connecting rod assembly .................. 1-28 Metric bolt torque specifications ............ 1-83 Connecting rod bearing oil clearance check . . 1-27 Oil consumption .......................... 1-51 Connecting rod bearings removal ........... 1-14 Oil filter construction and function ........... 1-48 Connecting rods disassembly and Oil filter maintenance ...................... 1-48 inspection ............................ 1-25 Oil pressure relief valve inspection .......... 1-51 Connecting rods removal .................. 1-14 Oil pressure relief valve removal ............ 1-51 Coolant ................................. 1-54 Oil pressure switch ........................ 1-7 Cooling fan .............................. 1-55 Oil pump adjustment ...................... 1-49 Cooling fan assembly ..................... 1-42 Oil pump assembly ....................... 1-38 Cooling system ........................... 1-52 Oil pump inspection ....................... 1-48 Cooling system description and operation .... 1-52 Oil pump installation ...................... 1-49 Cooling system maintenance ............... 1-54 Oil pump removal ......................... 1-48 Cooling system overhaul .................. 1-56 Oil strainer removal ....................... 1-14 Cooling system specifications .............. 1-82 Oil suction pipe and oil strainer ............. 1-37 Crankshaft .............................. 1-29 Oil suction pipe removal ................... 1-14 Crankshaft bearing (bushing) inspection ..... 1-30 Oilsump ................................ 1-37 Crankshaft bearing (bushing) replacement ... 1-31 Oil sump removal ......................... 1-13 Crankshaft inspection ..................... 1-29 Piston rings assembly ..................... 1-28 Crankshaft main bearing assembly .......... 1-31 Piston rings disassembly and inspection ..... 1-25 Crankshaft pulley ......................... 1-39 Piston rings removal ...................... 1-14 Crankshaft removal ....................... 1-15 Pistons and connecting rods ............... 1-36 Cylinder block ............................ 1-22 Pistons assembly ......................... 1-28 Cylinder block assembly .................... 1-3 Pistons disassembly and inspection ......... 1-23 Cylinder head assembly ............. 1-22, 1-40 Pistons removal .......................... 1-14 Cylinder head components .................. 1-3 Port block installation ..................... 1-32 Cylinder head disassembly ................ 1-16 Port block removal ........................ 1-32 Cylinder head inspection and repair ......... 1-16 Power steering pump ..................... 1-39 Cylinder head removal .................... 1-10 Pushrods ............................... 1-21 Description and operation ................... 1-2 Radiator cap ............................. 1-54 Engine disassembly ....................... 1-5 Radiator inspection ....................... 1-58 Engine identification ....................... 1-2 Radiator installation ....................... 1-58 Engine lubrication system .................. 1-45 Radiator removal ......................... 1-56 Engine lubrication system description ....... 1-45 Radiator repair ........................... 1-58 Engine oil pressure check ................. 1-50 Rear oil seal assembly .................... 1-35 Engine overhaul ........................... 1-5 Rocker arms ............................. 1-20 Engine reassembly ....................... 1-35 Rocker arm shaft removal .................. 1-9 Engine timing gear cover .................. 1-11 Special tools ............................. 1-84 Exhaust manifold assembly ................ 1-44 Specifications ............................ 1-68 External oil tube assembly ................. 1-43 Steering pump seal replacement ............ 1-34 External oil tube removal ................... 1-8 Support bracket removal ................... 1-9 Fanremoval .............................. 1-8 Temperature sending switch ................ 1-7 Flywheel .......................... 1-34, 1-36 Temperature sending switch assembly ....... 1-44 Flywheel removal ......................... 1-15 Thermostat .............................. 1-55 Front oil seal replacement ................. 1-34 Thermostat inspection ..................... 1-63 Fuel injection pump assembly .............. 1-39 Thermostat installation .................... 1-63

Thermostat removal ...................... 1-62 Thermostat repair ........................ 1-63 Timing gear .............................. 1-32 Timing gear cover assembly ............... 1-38 Timing gear cover removal ................. 1-1 1 Timing gear housing ...................... 1-34 Timing gears ............................. 1-1 1 Timing gears assembly .................... 1-38 Timing gears removal ..................... 1-1 3 Troubleshooting .......................... 1-64 Valve clearance adjustment ................ 1-41 Valve cover assembly ..................... 1-42 Valve cover removal ....................... 1-9 Valve guides ............................. 1-1 9 Valves .................................. 1-18 Valve seats .............................. 1-1 7 Valve springs ............................ 1-20 Valve tappet removal ...................... 1-1 0 Valve train components ..................... 1-3 Waterpump ............................. 1-55 Water pump assembly .................... 1-42 Water pump inspection .................... 1-61 Water pump installation .................... 1-61 Water pump removal .................. 1.8. 1-60 Water pump repair ........................ 1-61 SECTION 2 . FUEL SYSTEM Bleeding procedure ....................... 2-22 Bleeding the fuel system ................... 2-21 Compact timing device (CDT) mechanism .... 2-4 Delivery valve assembly .................... 2-4 Delivery valves ........................... 2-1 0 Fuel injection pump specifications ........... 2-39 Fuel variation mechanism ................... 2-3 Governor ............................... 2-24 Governor assembly ....................... 2-27 Governor description and operation ......... 2-24 Governor disassembly .................... 2-26 Governor system troubleshooting ........... 2-29 High idle adjustment ...................... 2-23 Injection pump ............................ 2-2 Injection pump description and operation ...... 2-2 Injection pump installation ................. 2-14 Injection pump removal .................... 2-12 Injection pump repair ...................... 2-13 Injectors ................................. 2-30 Injectors assembly and adjustment .......... 2-33 Injectors description and operation .......... 2-30 Injectors disassembly ..................... 2-33 Injectors removal ......................... 2-32 Installation using a new pump or drive component ........................... 2-16 Installation using original pump and drive components ...................... 2-15 Pumping elements ......................... 2-7 Smoke screw adjustment .................. 2-23 Special tools ............................. 2-40 Specifications ............................ 2-38 Specifications - fuel injection pump .......... 2-39 Spill timing procedure ..................... 2-17 Stop control knob .......................... 2-6 Timing and governor adjustment ............ 2-15 Troubleshooting . fuel injectors ............. 2-37 Troubleshooting . general .................. 2-34 Troubleshooting . governor system .......... 2-29 SECTION 3 . ELECTRICAL SYSTEM Alternator ......................... 3.3. 3-143 Alternatorassembly ..................... 3-156 Alternator bench check .................. 3-157 Alternator disassembly .................. 3-148 Alternator installation .................... 3-158 Alternator removal ..................... 3-1487 Alternator specifications ................. 3-159 Alternator troubleshooting ............... 3-160 Armature inspection .................... 3-166 Battery ................................... 3-2 Battery and fuses .......................... 3-4 Battery description ......................... 3-4 Battery installation ......................... 3-5 Battery removal ........................... 3-5 Bearing inspection ...................... 3-154 Brake release switch ....................... 3-3 Brush inspection ....................... 3-168 Brush, springs, and holder inspection ...... 3-154 Charging circuit ........................ 3-144 Charging system ....................... 3-143 Charging system description and operation 3-143 Charging system preliminary checks and electrical tests ....................... 3-146 Component location and function ............ 3-2 Cruise control brake release switch description ............................ 3-22 Cruise control brake release switch testing ... 3-22 Cruise control magnet description ........... 3-32 Cruise control magnet testing .............. 3-33 Cruise control relay ........................ 3-2 Description ............................... 3-2 Diodes description ........................ 3-23 Diodes testing ............................ 3-24 Electrical schematic ................. 3-46, 3-92 Electrical system components-description and testing ............................. 3-8 Electrolyte checking ....................... 3-4 Engine coolant temperature circuit .... 3-80, 3-114 3-116 Engine coolant temperature circuit troubleshooting ........................ 3-80 Engine coolant temperature sender ......... 3-37 Engine coolant temperature sender testing ... 3-37 Engine coolant temperature sending unit ...... 3-2 Engine coolant temperature switch .......... 3-36 Engine oil pressure circuit ........... 3-76, 3-110 Engine oil pressure circuit troubleshooting ... 3-76 Engine oil pressure sender ................. 3-36 Engine oil pressure sensor unit .............. 3-2 Engine sensors .......................... 3-36 Flasher relay .............................. 3-2 Flasher warning light ................ 3-41, 3-42 Flasher warningitaillight rear lights .... 3-43, 3-44 Front bracket inspection ................. 3-170 Fuel gauge removal ..................... 3-136

Fuel gauge testing ...................... 3-136 Fuel level circuit ................... 3.72. 3-106 Fuel level circuit troubleshooting ............ 3-72 Fuel level sender description ............... 3-37 Fuel level sender testing ................... 3-38 Fuel level sending unit ..................... 3-3 Fuel shutoff solenoid ....................... 3-3 Fuel shutoff solenoid circuit ............... 3-118 Fuel shutoff solenoid description ............ 3-39 Fuel shutoff solenoid removal .............. 3-39 Fuel shutoff solenoid testing ............... 3-39 Fuseblock ............................... 3-2 Fuse block description ..................... 3-6 Glow plug circuit .................... 3.56. 3.58, 3.98. 3-100 Glow plug circuit troubleshooting ...... 3.56. 3-58 Glow plug indicator light controller description ............................ 3-31 Glow plug indicator light controller testing .... 3-31 Glow plugs ............................... 3-3 Glow plugs description .................... 3-35 Glow plugs testing ........................ 3-35 Hazard flasher light relay description . . 3.28. 3-30 Hazard flasher light relay terminal identification .......................... 3-29 Hazard flasher light relay testing ...... 3.29. 3-30 Hazard flashing lights ...................... 3-2 Hazard light switch description ....... 3-13. 3-15 Hazard light switch removal .......... 3-14. 3-16 Hazard light switch testing ........... 3-15. 3-16 Hazard switch ............................. 3-2 Head lamp .............................. 3-40 Headlights ................................ 3-2 Housing inspection ..................... 3-154 HST control magnet ....................... 3-3 HST speed control ........................ 3-33 HST speed control switch ................... 3-3 HST speed control switch testing ........... 3-34 HST cruise control circuit ........... 3.68. 3-126 HST cruise control circuit troubleshooting .... 3-70 IC regulator ............................ 3-144 Individual circuit schematics ................ 3-46 Individual electrical circuits ................. 3-48 Instrument lights ........................ 3-141 Instrument panel .......................... 3-2 lnstrument panel-component operation and servicing ........................... 3-133 Instrument panel disassembly ............ 3-136 Instrument panel removal ................ 3-136 Introduction ............................... 3-2 Keyswitch ................................ 3-2 Key switch description ..................... 3-8 Key switch terminal and connector wiring identification ........................... 3-9 Key switch testing ........................ 3-10 Lighting ................................. 3-40 Lighting circuit ..................... 3.60. 3-64 3-102. 3-104 Lighting circuit troubleshooting ....... 3.62. 3-66 Light switch ............................... 3-2 Light switch description .................... 3-11 Light switch removal ...................... 3-12 Light switch testing ....................... 3-13 Main fuse ................................ 3-2 Main fuse description ...................... 3-7 Main fuse replacing ........................ 3-7 Mid PTO safety switch description .......... 3-19 Mid PTO safety switch testing .............. 3-20 Monitoring circuits ........................ 3-72 No-load test ........................... 3-174 Orbital gear and planetary gear inspection . 3-170 Overrunning clutch and pinion inspection . . 3-170 Parking brake circuit .................... 3-130 Parking brake switch ....................... 3-3 Parking brake switch description ............ 3-21 Parking brake switch testing ............... 3-21 Permanent magnet inspection ............ 3-167 Pinion position adjustment ............... 3-174 PTO indicator light circuit ........... 3.88. 3-128 PTO indicator light circuit troubleshooting .... 3-90 PTO speed indicator adjustment .......... 3-140 Rear bracket inspection ................. 3-170 Rear PTO safety switch description ......... 3-18 Rear PTO safety switch testing ............. 3-19 Rear work light ....................... 3.3. 3-45 Rectifier assembly inspection ............ 3-153 Relayldiode panel ......................... 3-2 Relays description and location ............. 3-25 Relay testing ............................. 3-27 Rotor inspection ........................ 3-150 Safety start switch ......................... 3-2 Solenoid inspection ..................... 3-171 Starter ................................... 3-2 Starter motor assembly .................. 3-162 Starter motor specifications .............. 3-175 Starter motor troubleshooting ............ 3-176 Starter solenoid ........................ 3-162 Starting circuit ...................... 3.48. 3.52. . 3.94. 3-96 Starting circuit troubleshooting ....... 3.50. 3-54 Startina motor disassemblv .............. 3-164 startin; motor reassemblyand adjustment . 3-172 Starting motor removal .................. 3-164 Starting system ........................ 3-162 Starting system description and operation . . 3-162 Starting system overhaul ................ 3-164 Stator inspection ....................... 3-152 Tachometer circuit ................. 3.84. 3-122 Tachometer circuit troubleshooting .......... 3-84 Tachometer removal .................... 3-139 Tachometer testing ..................... 3-140 Taillight ................................. 3-41 Taillights ................................. 3-2 Temperature gauge removal ............. 3-138 Temperature gauge testing ............... 3-138 Transmission range safety switch adjustment ............................ 3-17 Transmission range safety switch description ............................ 3-16 Transmission range safety switch testing .... 3-18 Wiring harnesses .......................... 3-3

SECTION 4 . CLUTCHES Clutch cross shaft bushings assembly ....... 4-1 7 Clutch cross shaft bushings removal ........ 4-1 7 Clutch linkage components ................ 4-1 7 Clutch pedal bushings assembly ............ 4-1 8 Clutch pedal bushings removal ............. 4-1 8 Clutch pilot bearing description ............. 4-1 5 Clutch pilot bearing installation ............. 4-1 5 Clutch pilot bearing removal ................ 4-1 5 Clutch release bearing assembly ........... 4-1 7 Clutch release bearing description .......... 4-1 6 Clutch release bearing inspection ........... 4-1 6 Clutch release bearing removal ............. 4-1 6 Double clutch adjustment ............. 4-11. 4-1 4 Double clutch assembly ................... 4-1 3 Double clutch description .................. 4-1 0 Double clutch disassembly ................. 4-1 2 Double clutch inspection ................... 4-1 3 Double clutch overhaul .................... 4-1 2 Free-play adjustment ................. 4.5. 4-1 1 Release lever height adjustment ............. 4-8 Servicing clutch-related components ........ 4-1 5 Single clutch adjustment .................... 4-5 Single clutch description .................... 4-2 Single clutch inspection .................... 4-6 Single clutch installation .................... 4-7 Single clutch removal ...................... 4-6 Single clutch operation ..................... 4-4 Single clutch overhaul ...................... 4-6 Special tools ............................. 4-21 Specifications ............................ 4-20 Troubleshooting .......................... 4-1 9 SECTION 5 . TRANSMISSION SYSTEMS Adjustment of shift arms ................... 5-19 Bolt torque specifications .................. 5-70 Charge pump relief valve .................. 5-43 Charge pump relief valve assembly ......... 5-43 Charge pump relief valve disassembly ....... 5-43 Charge pump relief valve inspection ......... 5-43 Charge pump relief valve test .............. 5-49 Charge pump removal .................... 5-35 Checkvalve ............................. 5-47 Check valve assembly .................... 5-47 Check valve disassembly .................. 5-47 Check valve inspection .................... 5-47 Countershaft assembly .................... 5-18 Countershaft removal ..................... 5-12 Cruise control adjustment .................. 5-67 Drive pinion assembly ............... 5-16. 5-62 Drive pinion removal ................ 5-14. 5-60 Fixed displacement motor operation ......... 5-25 Fluid flow forward position ................. 5-27 Fluid flow neutral position .................. 5-26 Fluid flow reverse position ................. 5-28 FWD drive shaft assembly ................. 5-1 7 FWD drive shaft removal ............ 5-13. 5-59 FWD main shaft .......................... 5-63 FWD shift rod assembly ............. 5.17. 5-63 FWD shift rod removal .............. 5-13. 5-58 9 x 3 Gear transmission .................... 5-2 9 x 3 Gear transmission assembly .......... 5-15 9 x 3 Gear transmission description and operation .............................. 5-2 9 x 3 Gear transmission disassembly ........ 5-10 9 x 3 Gear transmission inspection .......... 5-15 9 x 3 Gear transmission power flow .......... 5-5 9 x 3 Gear transmission removal ............ 5-10 High pressure relief valve .................. 5-44 High pressure relief valve installation ........ 5-44 High pressure relief valve removal .......... 5-44 High pressure relief valve test .............. 5-48 Hydrostatic motor disassembly ............. 5-33 Hydrostatic motor shaft removal ............ 5-35 Hydrostatic pump and port block assembly ... 5-44 Hydrostatic pump assembly ................ 5-38 Hvdrostatic pump disassemblv ............. 5-32 ~ydrostatic transmission assembly ......... 5-37 Hydrostatic transmission description and operation ............................. 5-22 Hydrostatic transmission disassembly ....... 5-31 Hydrostatic transmission gearbox adjustments ........................... 5-65 Hydrostatic transmission gearbox assembly . . 5-62 Hydrostatic transmission gearbox description and operation ......................... 5-51 Hydrostatic transmission gearbox inspection ............................ 5-61 Hydrostatic transmission gearbox overhaul ... 5-56 Hydrostatic transmission gearbox power flow .................................. 5-52 Hydrostatic transmission gearbox disassembly .......................... 5-56 Hydrostatic transmission gearbox removal ... 5-56 Hydrostatic transmission inspection ......... 5-36 Hydrostatic transmission overhaul .......... 5-29 Hydrostatic transmission removal ........... 5-29 Hydrostatic unit removal ................... 5-29 HST .................................... 5-52 HST motor cylinder block assembly ......... 5-41 HST neutral adjustment ................... 5-66 HST neutralizer adjustment ................ 5-67 HST neutralizer (spring holder) ............. 5-67 HST piston pump cylinder block assembly ... 5-40 Input shaft assembly (double clutch) ........ 5-21 Input shaft assembly (single clutch) ......... 5-21 Input shaft removal (single clutch) .......... 5-10 Input shaft removal (double clutch) .......... 5-10 Main gear shifter rod assembly ............. 5-19 Main gear shifter rod removal .............. 5-11 Main shaft assembly ...................... 5-18 Main shaft removal ....................... 5-12 Main transmission shift lever ............... 5-20 Mid-PTO link adjustment .................. 5-65 Motor and port block assembly ............. 5-46 Port block ............................... 5-42 Port block assembly ...................... 5-43 Port block disassembly .................... 5-42 Port block inspection ...................... 5-42 Port block neutral and feed valves .......... 5-42 Pressure tests ........................... 5-48 PTO countershaft assembly .......... 5-17. 5-62 PTO countershaft removal ........... 5-13. 5-60 PTO input shaft assembly ................. 5-64 PTO input shaft removal ................... 5-57

Range gear link adjustment ................ 5-65 Range gear shifter rod assembly ..... 5.16. 5-62 Range gear shifter rod removal ....... 5-14. 5-60 Rear main shaft assembly ........... 5.16. 5-63 Rear main shaft removal ............. 5.14. 5-59 Rear PTO link adjustment ................. 5-65 Reverse idler assembly ................... 5-18 Reverse idler shaft removal ................ 5-1 2 Transmission case assembly ............... 5-64 Transmission case removal ............... 5-57 Transmission input shaft assembly .......... 5-64 Transmission input shaft removal ........... 5-58 Treadle forward stop adjustment ............ 5-67 Treadle rear stop adjustment ............... 5-67 Troubleshooting .......................... 5-68 Shift arms adjustment ..................... 5-19 Special tools ............................. 5-71 Specifications ............................ 5-69 Swash plate removal ...................... 5-36 Variable displacement pump operation ....... 5-24 SECTION 6 . POWER TAKE-OFF SYSTEMS Description and operation ................... 6-2 9 x 3 Gear transmission . single clutch ....... 6-2 Live power take-off ........................ 6-4 One-way clutch assembly ................. 6-1 2 One-way clutch disassembly ................ 6-7 One-way clutch installation ................. 6-12 Mid-mount power take-off .................. 6-14 Mid-mount power take-off countershaft assembly ............................. 6-19 Mid-mount power take-off countershaft removal .............................. 6-15 Mid-mount power take-off description and operation ............................. 6-14 Mid-mount power take-off gearbox disassembly .......................... 6-1 6 Mid-mount power take-off gearbox assembly ............................. 6-17 Mid-mount power take-off gear shifter installation ............................ 6-17 Mid-mount power take-off gear shifter removal .............................. 6-16 Mid-mount power take-off inspection ........ 6-17 Mid-mount power take-off output shaft installation ............................ 6-17 Mid-mount power take-off output shaft removal .............................. 6-1 6 Mid-mount power take-off overhaul .......... 6-14 Mid-mount power take-off shifter arm assembly ............................. 6-18 Mid-mount power take-off shifter arm removal .............................. 6-1 5 Power take-off center countershaft assembly ............................. 6-12 Power take-off center countershaft removal ... 6-7 Power take-off front countershaft assembly . . 6-11 Power take-off front countershaft removal ..... 6-8 Power take-off . hydrostatic transmission ..... 6-5 Power take-off output shaft assembly ........ 6-13 Power take-off output shaft removal .......... 6-6 Power take-off overhaul .................... 6-6 Power take-off rear countershaft assembly ... 6-11 Power take-off rear countershaft removal ..... 6-8 Power take-off shifter assembly ............ 6-10 Power take-off shifter removal ............... 6-8 Rear power take-off components assembly . . 6-19 Specifications ............................ 6-20 Transmission drive ~ o w e r take-off ........... 6-2 SECTION 7 . DIFFERENTIAL. REAR AXLE AND BRAKES Bolt torque adjustment .................... 7-25 Brake linkage adjustment .................. 7-22 Brake operation ........................... 7-5 Brakes and final pinion assembly ........... 7-21 Brakes and final pinion inspection ........... 7-21 Brakes and final pinion installation .......... 7-21 Brakes and final pinion overhaul ............ 7-20 Brakes and final pinion removal ............. 7-20 Description and operation ................... 7-3 Differential assembly .................. 7.3. 7-14 Differential disassembly ................... 7-10 Differential inspection ..................... 7-10 Differential installation ..................... 7-14 Differential lock ............................ 7-3 Differential overhaul ........................ 7-8 Differential removal ........................ 7-8 Drive pinion assembly ..................... 7-13 Drive pinion disassembly (HST transmission) .................... 7-11 Drive pinion disassembly (9 x 3 transmission) .................... 7-12 Drive pinion installation .................... 7-13 Drive pinion removal ...................... 7-11 Introduction ............................... 7-2 Overhaul ................................. 7-8 Parking brake ............................. 7-6 Rear axle and brakes ...................... 7-4 Rear axle assembly ....................... 7-19 Rear axle disassembly .................... 7-18 Rear axle inspection ...................... 7-18 Rear axle removal ........................ 7-18 Ring gear and pinion gear pattern specification and adjustment ............ 7-24 Specifications ............................ 7-23 SECTION 8 . HYDRAULIC SYSTEM Adjustments ............................. 8-24 Bolt torque specifications .................. 8-51 Bypass spool fluid flow . closed position ...... 8-8 Bypass spool fluid flow . open position ........ 8-8 Combination system relief-diverter valve manifold assembly ................. 8-4 Combination system relief valve and diverter valve assembly ........................ 8-22 Combination system relief valve and diverter valve assembly assembly ............... 8-23 Combination system relief valve and diverter valve assembly disassembly ............ 8-23 Combination system relief valve and diverter valve assembly inspection .............. 8-23

Combination system relief valve and diverter valve assembly removal ................ 8-22 Control lever adjustment ................... 8-24 Control valve assembly (HPL) ............... 8-5 Description ............................... 8-2 Flow control valve ......................... 8-9 Flow control valve assembly ............... 8-17 Flow control valve disassembly ............. 8-1 7 Flow control valve inspection ............... 8-17 Flow control valve removal ................. 8-17 Fluid flow . bypass spool ................... 8-8 Fluid flow . bucket control . dumping and lift control . neutral ....................... 8-34 Fluid flow . bucket control . dumping REGEN and lift control . neutral ................. 8-35 Fluid flow . bucket control . roll back and lift control . neutral ....................... 8-36 Fluid flow . bucket control . neutral and lift control . float .......................... 8-39 Fluid flow . bucket control . neutral and lift control . lowering ...................... 8-38 Fluid flow . bucket control . neutral and lift . control . neutral ....................... 8-33 Fluid flow . bucket control . neutral and lift control . raising ........................ 8-37 Fluid flow . lowering position ................ 8-7 Fluid flow . neutral position .................. 8-5 Fluid flow . neutral position . rear (single- spool) remote system .................. 8-30 Fluid flow . raising position .................. 8-6 Fluid flow . remote cylinder extended . rear (single-spool) remote system ............ 8-31 Fluid flow . remote cylinder retracted . rear (single-spool) remote system ............ 8-32 Front (double-spool) remote control system . . 8-33 Front (double-spool) remote control valve assembly ........................ 8-44 Front (double-spool) remote control valve disassembly ..................... 8-42 Front (double-spool) remote control valve inspection ....................... 8-44 Front (double-spool) remote control valve pressure testing .................. 8-49 Front (double-spool) remote control valve removal ......................... 8-41 Front (double-spool) remote valve .......... 8-28 HPL linkage adjustments .................. 8-24 HPL linkage adjustment procedure .......... 8-24 Hydraulic control valve .................... 8-18 Hydraulic control valve assembly ........... 8-20 Hydraulic control valve disassembly ......... 8-1 8 Hydraulic control valve inspection ........... 8-19 Hydraulic control valve installation .......... 8-22 Hydraulic control valve removal ............. 8-18 Hydraulic fluid filter ........................ 8-3 Hydraulic pump .......................... 8-25 Hydraulic pump and filter .................. 8-25 Hydraulic pump and filter description ........ 8-25 Hydraulic pump assembly ................. 8-26 Hydraulic pump disassembly ............... 8-26 Hydraulic pump inspection ................ 8-26 Hydraulic pump repair ..................... 8-26 Introduction ............................... 8-2 Leakage operation . single lever ............. 8-9 Lift cylinder assembly ..................... 8-14 Lift cylinder disassembly ................... 8-12 Lift cylinder inspection ..................... 8-14 Lift cylinder removal ...................... 8-11 Lift cylinder repair ........................ 8-14 Lowering position fluid flow ................. 8-7 Main system relief valve pressure testing .... 8-48 Neutral position fluid flow ................... 8-5 Overhaul ........................... 8-11. 8-40 Position control leakage operation ........... 8-9 Position control operation .................. 8-10 Pressure testing .......................... 8-48 Raising position fluid flow ................... 8-6 Rear (single-spool) remote valve ........... 8-28 Rear (single-spool) remote valve assembly ............................. 8-41 Rear (single-spool) remote valve disassembly .......................... 8-40 Rear (single-spool) remote valve inspection . . 8-41 Rear (single-spool) remote valve removal .... 8-40 Relief valve adjustment .................... 8-45 Relief valve assembly ..................... 8-45 Relief valve disassembly .................. 8-45 Relief valve inspection .................... 8-45 Remote valves ........................... 8-27 Remote valve description and operation ..... 8-27 Relief-diverter valve manifold assembly ....... 8-4 Single lever leakage operation ............... 8-9 Special tools ............................. 8-52 Specifications ............................ 8-50 Troubleshooting .......................... 8-46 SECTION 9 . STEERING SYSTEMS . POWER STEERING Adjustable steering column operation ........ 9-31 Adjustable steering column disassembly ..... 9-33 Adjustable steering column Inspection ....... 9-34 Adjustable steering column reassembly ...... 9-35 Bolt torque specifications .................. 9-43 Checkvalve .............................. 9-4 Control motor checkvalve .................. 9-4 Control motor drive shaft ................... 9-4 Control motor gerotor motor ................. 9-4 Control motor relief valve ................... 9-4 Control motor spool and sleeve .............. 9-3 Drivesha ft ................................ 9-4 Fluid flow left turn .......................... 9-7 Fluid flow neutral position ................... 9-6 Fluid flow right turn ........................ 9-8 Gerotor motor ............................. 9-4 Manual operation .......................... 9-9 Power steering control motor ................ 9-3 Power steering cylinder .................... 9-5 Power steering operation ................... 9-6 Power steering pump ...................... 9-5 Power steerinn pump and reservoir tank ..... 9-24 . . . Power steering pump assembly ............ 9-25 Power steering pump disassembly .......... 9-25 Power steerina DU~D ins~ection and re~air ... 9-25 -. . . Power steering pump removal .............. 9-24 Power steering system ..................... 9-2 Power steering system description and operation ............................... 9-2

Power steering system overhaul ............ 9-10 Power steering tubes ..................... 9-26 Pressure testing .......................... 9-39 Pump. steering motor. and relief valve pressure testing ....................... 9-39 Relief valve ............................... 9-4 Special tools ............................. 9-42 Specifications ............................ 9-41 Spool and sleeve .......................... 9-3 Steering column assembly and installation ............................ 9-30 Steering column removal and disassembly .......................... 9-27 Steering control motor assembly ............ 9-14 Steering control motor disassembly ......... 9-11 Steering control motor inspection ........... 9-14 Steering control motor installation ........... 9-20 Steering control motor removal ............. 9-10 Steering cylinder assembly ................ 9-23 Steering cylinder disassembly .............. 9-22 Steering cylinder inspection ................ 9-23 Steering cylinder installation ............... 9-23 Steering cylinder pressure testing ........... 9-40 Steering cylinder removal .................. 9-21 Troubleshooting .......................... 9-37 SECTION 10 . FRONT AXLE AND RELATED PARTS Axle and differential assembly ............ Bevel gear-to-pinion backlash check ...... Bolt torque specifications ................ Differential assembly .................... Differential case bearing pre-load check and adjustment ...................... Differential disassembly ................. Differential gear assembly ............... Differential inspection ................... Differential repair ....................... Drive pinion assembly ................... Front axle and differential assembly ....... Front axle and differential disassembly .... Front axle inspection .................... Front axle repair ........................ Front-wheel drive ........................ Front-wheel drive description and operation Front-wheel drive overhaul ............... Front-wheel drive removal ............... Front wheel hub disassembly ............. Front wheel hub removal ................. Gear reduction . drop box inspection andrepair .......................... Reduction gearbox assembly ............. Reduction gear . drop box disassembly .... Reduction gear . drop box inspection ...... Reduction gear . drop box repair .......... Ring gear-to-pinion backlash check and adjustment .......................... Special tools ........................... Specifications .......................... Spindle assembly ........................ Spindle disassembly ..................... Spindle inspection ....................... Spindle removal .......................... 10-6 Spindle repair ............................ 10-6 Troubleshooting ........................ 10-25 Two-wheel drive .......................... 10-2 Two-wheel drive description and operation ... 10-2 Two-wheel drive overhaul .................. 10-4 SECTION 11 . SUPERSTEER. FRONT AXLE. AND SENSITRACK Automatic position (disengaged) ........... 11 -30 Automatic position (engaged) ............. 11-30 Axle and differential assembly ............. 11 -47 Bevel gear-to-pinion backlash check ....... 11-53 Bolt torque specifications ................. 11 -62 Checkvalve ............................. 11-6 Control motor check valve ................. 11-6 Control motor drive shaft .................. 11-6 Control motor gerotor pump ................ 11-6 Control motor relief valve .................. 11-6 Control motor spool and sleeve ............. 11-6 Differential case bearing preload check and adjustment ....................... 11-48 Differential gear assembly ................ 11 -46 Differential inspection and repair ........... 11 -45 Drive pinion disassembly ................. 11 -44 Drive pinion inspection and repair .......... 11-44 Drivesha ft ............................... 11-6 Drop box disassembly .................... 11 -40 Drop box inspection and repair ............ 11 -45 Fluid flow left turn ......................... 11-9 Fluid flow neutral position .................. 11-8 Fluid flow right turn ...................... 11-10 Front axle and differential assembly ........ 11-46 Front axle and differential disassembly ..... 11-43 Full time front wheel drive (locked down) .... 11-30 General information ....................... 11-2 Gerotor pump ............................ 11-6 Lubrication ............................. 11-56 Manual operation ........................ 11 -11 Overhaul ......................... 11 -1 2, 11 -39 Power steering control motor ............... 11-6 Power steering description and operation .... 11-4 Power steering operation .................. 11-8 Power steering pump ..................... 11-7 Power steerinn pump and reservoir tank .... 11-26 . . . Po~er steer ng pump assemo y 11 -27 Po~er steer ng pump a sassemo y 11 -26 Power steering pump inspection and repair ............................... 11-27 Power steering pump pressure testing ...... 11-57 Power steering pump removal ............. 11 -26 Pressure testing ......................... 11 -57 Reduction gear box assembly ............. 11 -50 Reduction gear disassembly .............. 11-40 Reduction gear inspection and repair ....... 11-45 Relief valve .............................. 11-6 Relief valve pressure testing .............. 11 -57 Reservoir tank .......................... 11 -26 Ring gear-to-pinion backlash check and adjustment ........................... 11-48 Sensitrack assembly ..................... 11 -35 Sensitrack disassembly .................. 11 -34

Sensitrack inspection and repair ........... 11 -34 Sensitrack removal ...................... 11 -33 Special tools ............................ 11 -61 Specifications ........................... 11 -59 Spool and sleeve ......................... 11 -6 Steering control motor assembly ........... 11 -1 7 Steering control motor disassembly ........ 11 -1 3 Steering control motor inspection .......... 11 -1 6 Steering control motor installation .......... 11 -23 Steering control motor pressure testing ..... 11-57 Steering control motor removal ............ 11 -1 2 Steering cylinder assembly ............... 11 -25 Steering cylinder disassembly ............. 11 -24 Steering cylinder inspection ............... 11 -25 Steering cylinder installation .............. 11 -25 Steering cylinder pressure testing .......... 11 -58 Steering cylinder removal ................. 11 -24 Steering cylinders ........................ 11 -7 Steering tubes .......................... 11 -28 SuperSteer automatic position (disengaged) ......................... 11 -30 Supersteer automatic position (engaged) ... 11 -30 SuperSteer description and operation . 11 .2. 11 -29 Supersteer front axle .................... 11 -31 Supersteer. front axle. and sensitrack ...... 11 -29 SuperSteer full time front wheel drive (locked down) ........................ 11 -31 Troubleshooting ......................... 11 -54 SECTION 12 -WHEELS AND TIRES Front tire inflation pressures ................ 12-6 Liquid ballast ............................. 12-6 Rear axle tread setting .................... 12-3 Rear tire inflation pressures ................ 12-6 Rear wheel weight installation .............. 12-5 Tire pressure ............................ 12-6 Tractor weighting ......................... 12-3 Tread setting . FWD ...................... 12-2 Tread setting . 2WD ...................... 12-2 Wheel nut torque specification .............. 12-6 Weighting for stability ..................... 12-3 Weighting limitations ...................... 12-3 Wheels and tires ......................... 12-2 SECTION 13 . SEPARATING THE TRACTOR Front axle ............................... 13-2 Front axle support installation ............. 13-1 1 Front axle support removal ................. 13-9 Front wheel drive front axle installation ...... 13-5 Front wheel drive front axle removal ......... 13-4 9 x 3 Gear transmission ................. 13-1 6 9 x3 Gear transmission installation ....... 13-16 9 x 3 Gear transmission removal .......... 13-1 6 Hydrostatic gearbox and unit installation ... 13-18 Hydrostatic gearbox removal ............. 13-1 8 Hydrostatic transmission ................ 13-1 7 Hydrostatic unit removal ................. 13-1 8 Installation after separation between the front axle support and engine ........... 13-1 1 Rear axle and center housing ............ 13-1 9 Rear axle and center housing installation .......................... 13-21 Rear axle and center housing removal ..... 13-1 9 Separating the tractor between the clutch housing. front 9 x 3 gear transmission housing. and the rear axle center housing 13-1 6 Separating the tractor between the clutch housing. hydrostatic transmission. and the rear axle center housing ........... 13-1 7 Separating the tractor between the engine and clutch housing ................... 13-1 2 Separating the tractor between the front axle and the axle support .................... 3-2 Separating the tractor between the front axle support and engine ................ 13-9 Separating the tractor between the rear axle and center housing .............. 13-1 9 Supersteer front axle installation ............ 13-7 Supersteer front axle removal .............. 13-5 Two-wheel drive front axle installation ....... 13-3 Two-wheel drive front axle removal .......... 13-2

1-1 SECTION 1 ENGINE SYSTEMS CONTENTS GENERAL INFORMATION 1-2 ............................................................ ENGINE OVERHAUL 1-5 ................................................................. DISASSEMBLY, INSPECTION, FITS, CLEARANCES, AND ASSEMBLY OF COMPONENT ASSEMBLIES 1-16 ........................................................ ENGINE REASSEMBLY 1-35 ............................................................. ENGINE LUBRICATION SYSTEM 1-45 .................................................... COOLING SYSTEM 1-52 ................................................................. COOLING SYSTEM OVERHAUL 1-56 ..................................................... TROUBLESHOOTING 1-64 ............................................................... SPECIFICATIONS 1-68 .................................................................. METRIC BOLT TORQUE SPECIFICATIONS 1-83 ........................................... SPECIAL TOOLS 1-84 ................................................................... INDEX 2-41 .............................................................................

New Holland TC25 TC25D Tractor Service Repair Shop Manual Workshop

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