New Holland 1725 1925 Repair Manual

Description

Factory Workshop Repair Service Manual New Holland Tractors 1725 1925 . Detailed Step by Step Instructions, diagrams, illustrations make easy any repair, Overhaul, Disassembly and Assembly, Testing, Adjustment, Replacement and Change, Inspection and Adjustment, etc.

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MODELS Covered

New Holland

1725

1925

SECTIONS covered

* Section Index
* Engine Systems
* Fuel System
* Electrical System
* Clutches
* Transmission Systems
* Power Take Off Systems Pto
* Differential, Rear Axle & Brakes
* Hydraulic System
* Steering Systems – Power Steering
* Front Axle & Related Parts
* Front Axle Optional Equipment
* Wheels And Tires
* Separating The Tractor

ENGINE SYSTEMS
Air inlet manifold removal
Air intake manifold assembly
Alternator assembly
Alternator removal
Backplate and oil seal
Backplate assembly
Bolt torque values
Camshaft
Camshaft assembly
Camshaft disassembly
Camshaft inspection
Camshaft removal
Compression test and tools
Connecting rod assembly
Connecting rod bearing oil clearance check
Connecting rod bearings removal
Connecting rods disassembly and inspection
Connecting rods removal
Coolant
Cooling fan
Cooling fan assembly
Cooling system
Cooling system description and operation
Cooling system maintenance
Cooling system overhaul
Cooling system specifications
Crankshaft
Crankshaft bearing (bushing) inspection
Crankshaft bearing (bushing) replacement
Crankshaft inspection
Crankshaft main bearing assembly
Crankshaft pulley
Crankshaft removal
Cylinder block
Cylinder block assembly
Cylinder head assembly
Cylinder head components
Cylinder head disassembly
Cylinder head inspection and repair
Cylinder head removal
Description and operation
Engine disassembly
Engine identification
Engine lubrication system
Engine lubrication system description
Engine oil pressure check
Engine overhaul
Engine reassembly
Engine timing gear cover
Exhaust manifold assembly
External oil tube assembly
External oil tube removal
Fan removal
Flywheel
Flywheel removal
Front oil seal replacement
Fuel injection pump assembly
Fuel injector assembly
Fuel injector removal
Fuel piping
Fuel shutoff solenoid removal
General information
Glow plug assembly
Glow plug removal
Head gasket selection
Idler gear assembly
Injection timing
Main bearing and thrust washer removal and inspection
Main bearings removal
Metric bolt torque specifications
Oil consumption
Oil filter construction and function
Oil filter maintenance
Oil pressure relief valve inspection
Oil pressure relief valve removal
Oil pressure switch
Oil pump adjustment
Oil pump assembly
Oil pump inspection
Oil pump installation
Oil pump removal
Oil strainer removal
Oil suction pipe and oil strainer
Oil suction pipe removal
Oil sump
Oil sump removal
Piston rings assembly
Piston rings disassembly and inspection
Piston rings removal
Pistons and connecting rods
Pistons assembly
Pistons disassembly and inspection
Pistons removal
Port block installation
Port block removal
Power steering pump
Push rods
Radiator cap
Radiator inspection
Radiator installation
Radiator removal
Radiator repair
Rear oil seal assembly
Rocker arms
Rocker arm shaft removal
Special tools
Specifications
Steering pump seal replacement
Support bracket removal
Temperature sending switch
Temperature sending switch assembly
Thermostat
Thermostat inspection
Thermostat installation
Thermostat removal
Thermostat repair
Timing gear
Timing gear cover assembly
Timing gear cover removal
Timing gear housing
Timing gears
Timing gears assembly
Timing gears removal
Troubleshooting
Valve clearance adjustment
Valve cover assembly
Valve cover removal
Valve guides
Valves
Valve seats
Valve springs
Valve tappet removal
Valve train components
Water pump
Water pump assembly
Water pump inspection
Water pump installation
Water pump removal
Water pump repair

FUEL SYSTEM
Bleeding procedure
Bleeding the fuel system
Compact timing device (CDT) mechanism
Delivery valve assembly
Delivery valves
Fuel injection pump specifications
Fuel variation mechanism
Governor
Governor assembly
Governor description and operation
Governor disassembly
Governor system troubleshooting
High idle adjustment
Injection pump
Injection pump description and operation
Injection pump installation
Injection pump removal
Injection pump repair
Injectors
Injectors assembly and adjustment
Injectors description and operation
Injectors disassembly
Injectors removal
Installation using a new pump or drive component
Installation using original pump and drive components
Pumping elements
Smoke screw adjustment
Special tools
Specifications
Specifications – fuel injection pump
Spill timing procedure
Stop control knob
Timing and governor adjustment
Troubleshooting – fuel injectors
Troubleshooting – general
Troubleshooting – governor system

ELECTRICAL SYSTEM
Alternator
Alternator assembly
Alternator bench check
Alternator disassembly
Alternator installation
Alternator removal
Alternator specifications
Alternator troubleshooting
Armature inspection
Battery
Battery and fuses
Battery description
Battery installation
Battery removal
Bearing inspection
Brake release switch
Brush inspection
Brush, springs, and holder inspection
Charging circuit
Charging system
Charging system description and operation
Charging system preliminary checks and electrical tests
Component location and function
Cruise control brake release switch description
Cruise control brake release switch testing
Cruise control magnet description
Cruise control magnet testing
Cruise control relay
Description
Diodes description
Diodes testing
Electrical schematic
Electrical system components-description and testing
Electrolyte checking
Engine coolant temperature circuit
Engine coolant temperature circuit troubleshooting
Engine coolant temperature sender
Engine coolant temperature sender testing
Engine coolant temperature sending unit
Engine coolant temperature switch
Engine oil pressure circuit
Engine oil pressure circuit troubleshooting
Engine oil pressure sender
Engine oil pressure sensor unit
Engine sensors
Flasher relay
Flasher warning light
Flasher warning/taillight rear lights
Front bracket inspection
Fuel gauge removal
Fuel gauge testing
Fuel level circuit
Fuel level circuit troubleshooting
Fuel level sender description
Fuel level sender testing
Fuel level sending unit
Fuel shutoff solenoid
Fuel shutoff solenoid circuit
Fuel shutoff solenoid description
Fuel shutoff solenoid removal
Fuel shutoff solenoid testing
Fuse block
Fuse block description
Glow plug circuit
Glow plug circuit troubleshooting
Glow plug indicator light controller description
Glow plug indicator light controller testing
Glow plugs
Glow plugs description
Glow plugs testing
Hazard flasher light relay description
Hazard flasher light relay terminal identification
Hazard flasher light relay testing
Hazard flashing lights
Hazard light switch description
Hazard light switch removal
Hazard light switch testing
Hazard switch
Head lamp
Headlights
Housing inspection
HST control magnet
HST speed control
HST speed control switch
HST speed control switch testing
HST cruise control circuit
HST cruise control circuit troubleshooting
IC regulator
Individual circuit schematics
Individual electrical circuits
Instrument lights
Instrument panel
Instrument panel-component operation and servicing
Instrument panel disassembly
Instrument panel removal
Introduction
Key switch
Key switch description
Key switch terminal and connector wiring identification
Key switch testing
Lighting
Lighting circuit
Lighting circuit troubleshooting
Light switch
Light switch description
Light switch removal
Light switch testing
Main fuse
Main fuse description
Main fuse replacing
Mid PTO safety switch description
Mid PTO safety switch testing
Monitoring circuits
No-load test
Orbital gear and planetary gear inspection
Overrunning clutch and pinion inspection
Parking brake circuit
Parking brake switch
Parking brake switch description
Parking brake switch testing
Permanent magnet inspection
Pinion position adjustment
PTO indicator light circuit
PTO indicator light circuit troubleshooting
PTO speed indicator adjustment
Rear bracket inspection
Rear PTO safety switch description
Rear PTO safety switch testing
Rear work light
Rectifier assembly inspection
Relay/diode panel
Relays description and location
Relay testing
Rotor inspection
Safety start switch
Solenoid inspection
Starter
Starter motor assembly
Starter motor specifications
Starter motor troubleshooting
Starter solenoid
Starting circuit
Starting circuit troubleshooting
Starting motor disassembly
Starting motor reassembly and adjustment
Starting motor removal
Starting system
Starting system description and operation
Starting system overhaul
Stator inspection
Tachometer circuit
Tachometer circuit troubleshooting
Tachometer removal
Tachometer testing
Tail light
Tail lights
Temperature gauge removal
Temperature gauge testing
Transmission range safety switch adjustment
Transmission range safety switch description
Transmission range safety switch testing
Wiring harnesses

CLUTCHES
Clutch cross shaft bushings assembly
Clutch cross shaft bushings removal
Clutch linkage components
Clutch pedal bushings assembly
Clutch pedal bushings removal
Clutch pilot bearing description
Clutch pilot bearing installation
Clutch pilot bearing removal
Clutch release bearing assembly
Clutch release bearing description
Clutch release bearing inspection____
Clutch release bearing removal
Double clutch adjustment
Double clutch assembly
Double clutch description
Double clutch disassembly
Double clutch inspection
Double clutch overhaul
Free-play adjustment
Release lever height adjustment
Servicing clutch-related components
Single clutch adjustment
Single clutch description
Single clutch inspection
Single clutch installation
Single clutch removal
Single clutch operation
Single clutch overhaul
Special tools
Specifications
Troubleshooting

TRANSMISSION SYSTEMS
Adjustment of shift arms
Bolt torque specifications
Charge pump relief valve
Charge pump relief valve assembly
Charge pump relief valve disassembly
Charge pump relief valve inspection
Charge pump relief valve test
Charge pump removal
Check valve
Check valve assembly
Check valve disassembly
Check valve inspection
Countershaft assembly
Countershaft removal
Cruise control adjustment
Drive pinion assembly
Drive pinion removal
Fixed displacement motor operation
Fluid flow forward position
Fluid flow neutral position
Fluid flow reverse position
FWD drive shaft assembly
FWD drive shaft removal
FWD main shaft
FWD shift rod assembly
FWD shift rod removal
9×3 Gear transmission
9 x 3 Gear transmission assembly
9×3 Gear transmission description and
operation
9×3 Gear transmission disassembly
9×3 Gear transmission inspection
9×3 Gear transmission power flow
9×3 Gear transmission removal
High pressure relief valve
High pressure relief valve installation
High pressure relief valve removal
High pressure relief valve test
Hydrostatic motor disassembly
Hydrostatic motor shaft removal
Hydrostatic pump and port block assembly
Hydrostatic pump assembly
Hydrostatic pump disassembly
Hydrostatic transmission assembly
Hydrostatic transmission description and operation
Hydrostatic transmission disassembly
Hydrostatic transmission gearbox adjustments
Hydrostatic transmission gearbox assembly
Hydrostatic transmission gearbox description and operation
Hydrostatic transmission gearbox inspection
Hydrostatic transmission gearbox overhaul
Hydrostatic transmission gearbox power flow
Hydrostatic transmission gearbox disassembly
Hydrostatic transmission gearbox removal
Hydrostatic transmission inspection
Hydrostatic transmission overhaul
Hydrostatic transmission removal
Hydrostatic unit removal
HST
HST motor cylinder block assembly
HST neutral adjustment
HST neutralizer adjustment
HST neutralizer (spring holder)
HST piston pump cylinder block assembly
Input shaft assembly (double clutch)
Input shaft assembly (single clutch)
Input shaft removal (single clutch)
Input shaft removal (double clutch)
Main gear shifter rod assembly
Main gear shifter rod removal
Main shaft assembly
Main shaft removal
Main transmission shift lever
Mid-PTO link adjustment
Motor and port block assembly
Port block
Port block assembly
Port block disassembly
Port block inspection
Port block neutral and feed valves
Pressure tests
PTO countershaft assembly
PTO countershaft removal
PTO input shaft assembly
PTO input shaft removal
Range gear link adjustment
Range gear shifter rod assembly
Range gear shifter rod removal
Rear main shaft assembly
Rear main shaft removal
Rear PTO link adjustment
Reverse idler assembly
Reverse idler shaft removal
Transmission case assembly
Transmission case removal
Transmission input shaft assembly
Transmission input shaft removal
Treadle forward stop adjustment
Treadle rear stop adjustment
Troubleshooting
Shift arms adjustment
Special tools
Specifications
Swash plate removal
Variable displacement pump operation

POWER TAKE-OFF SYSTEMS
Description and operation
9×3 Gear transmission – single clutch
Live power take-off
One-way clutch assembly
One-way clutch disassembly
One-way clutch installation
Mid-mount power take-off
Mid-mount power take-off countershaft assembly
Mid-mount power take-off countershaft removal
Mid-mount power take-off description and operation
Mid-mount power take-off gearbox disassembly
Mid-mount power take-off gearbox assembly
Mid-mount power take-off gear shifter installation
Mid-mount power take-off gear shifter removal
Mid-mount power take-off inspection
Mid-mount power take-off output shaft installation
Mid-mount power take-off output shaft removal
Mid-mount power take-off overhaul
Mid-mount power take-off shifter arm assembly
Mid-mount power take-off shifter arm removal
Power take-off center countershaft assembly
Power take-off center countershaft removal
Power take-off front countershaft assembly
Power take-off front countershaft removal
Power take-off – hydrostatic transmission
Power take-off output shaft assembly
Power take-off output shaft removal
Power take-off overhaul
Power take-off rear countershaft assembly
Power take-off rear countershaft removal
Power take-off shifter assembly
Power take-off shifter removal
Rear power take-off components assembly
Specifications
Transmission drive power take-off

DIFFERENTIAL, REAR AXLE AND BRAKES
Bolt torque adjustment
Brake linkage adjustment
Brake operation
Brakes and final pinion assembly
Brakes and final pinion inspection
Brakes and final pinion installation
Brakes and final pinion overhaul
Brakes and final pinion removal
Description and operation
Differential assembly
Differential disassembly
Differential inspection
Differential installation
Differential lock
Differential overhaul
Differential removal
Drive pinion assembly
Drive pinion disassembly (HST transmission)
Drive pinion disassembly (9×3 transmission)
Drive pinion installation
Drive pinion removal
Introduction
Overhaul
Parking brake
Rear axle and brakes
Rear axle assembly
Rear axle disassembly
Rear axle inspection
Rear axle removal
Ring gear and pinion gear pattern specification and adjustment
Specifications

HYDRAULIC SYSTEM
Adjustments
Bolt torque specifications
Bypass spool fluid flow – closed position
Bypass spool fluid flow – open position
Combination system relief-diverter valve manifold assembly
Combination system relief valve and diverter valve assembly
Combination system relief valve and diverter valve assembly assembly
Combination system relief valve and diverter valve assembly disassembly
Combination system relief valve and diverter valve assembly inspection
Combination system relief valve and diverter valve assembly removal
Control lever adjustment
Control valve assembly (HPL)
Description
Flow control valve
Flow control valve assembly
Flow control valve disassembly
Flow control valve inspection
Flow control valve removal
Fluid flow – bypass spool
Fluid flow – bucket control – dumping and lift control – neutral
Fluid flow – bucket control – dumping REGEN and lift control – neutral
Fluid flow – bucket control – roll back and lift control – neutral
Fluid flow – bucket control – neutral and lift control – float
Fluid flow – bucket control – neutral and lift control – lowering
Fluid flow – bucket control – neutral and lift – control – neutral
Fluid flow – bucket control – neutral and lift control – raising
Fluid flow – lowering position
Fluid flow – neutral position
Fluid flow – neutral position – rear (single- spool) remote system
Fluid flow – raising position
Fluid flow – remote cylinder extended – rear (single-spool) remote system
Fluid flow – remote cylinder retracted – rear (single-spool) remote system
Front (double-spool) remote control system
Front (double-spool) remote control valve assembly
Front (double-spool) remote control valve disassembly
Front (double-spool) remote control valve inspection
Front (double-spool) remote control valve pressure testing
Front (double-spool) remote control valve removal
Front (double-spool) remote valve
HPL linkage adjustments
HPL linkage adjustment procedure
Hydraulic control valve
Hydraulic control valve assembly
Hydraulic control valve disassembly
Hydraulic control valve inspection
Hydraulic control valve installation
Hydraulic control valve removal
Hydraulic fluid filter
Hydraulic pump
Hydraulic pump and filter
Hydraulic pump and filter description
Hydraulic pump assembly
Hydraulic pump disassembly
Hydraulic pump inspection
Hydraulic pump repair
Introduction
Leakage operation – single lever
Lift cylinder assembly
Lift cylinder disassembly
Lift cylinder inspection
Lift cylinder removal
Lift cylinder repair
Lowering position fluid flow
Main system relief valve pressure testing
Neutral position fluid flow
Overhaul
Position control leakage operation
Position control operation
Pressure testing
Raising position fluid flow
Rear (single-spool) remote valve
Rear (single-spool) remote valve assembly
Rear (single-spool) remote valve disassembly
Rear (single-spool) remote valve inspection
Rear (single-spool) remote valve removal
Relief valve adjustment
Relief valve assembly
Relief valve disassembly
Relief valve inspection
Remote valves
Remote valve description and operation
Relief-diverter valve manifold assembly
Single lever leakage operation
Special tools
Specifications
Troubleshooting

STEERING SYSTEMS POWER STEERING
Adjustable steering column operation
Adjustable steering column disassembly
Adjustable steering column Inspection
Adjustable steering column reassembly
Bolt torque specifications
Check valve
Control motor check valve
Control motor drive shaft
Control motor gerotor motor
Control motor relief valve
Control motor spool and sleeve
Drive shaft
Fluid flow left turn
Fluid flow neutral position
Fluid flow right turn
Gerotor motor
Manual operation
Power steering control motor
Power steering cylinder
Power steering operation
Power steering pump
Power steering pump and reservoir tank
Power steering pump assembly
Power steering pump disassembly
Power steering pump inspection and repair
Power steering pump removal
Power steering system
Power steering system description and
Power steering system overhaul
Power steering tubes
Pressure testing
Pump, steering motor, and relief valve pressure testing
Relief valve
Special tools
Specifications
Spool and sleeve
Steering column assembly and installation
Steering column removal and disassembly
Steering control motor assembly
Steering control motor disassembly
Steering control motor inspection
Steering control motor installation
Steering control motor removal
Steering cylinder assembly
Steering cylinder disassembly
Steering cylinder inspection
Steering cylinder installation
Steering cylinder pressure testing
Steering cylinder removal
Troubleshooting

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 and repair
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
operation
Spindle removal
Spindle repair
Troubleshooting
Two-wheel drive
Two-wheel drive description and operation
Two-wheel drive overhaul

SUPERSTEER, FRONT AXLE, AND SENSITRACK
Automatic position (disengaged)
Automatic position (engaged)
Axle and differential assembly
Bevel gear-to-pinion backlash check
Bolt torque specifications
Check valve
Control motor check valve
Control motor drive shaft
Control motor gerotor pump
Control motor relief valve
Control motor spool and sleeve
Differential case bearing preload check and adjustment
Differential gear assembly
Differential inspection and repair
Drive pinion disassembly
Drive pinion inspection and repair
Drive shaft
Drop box disassembly
Drop box inspection and repair
Fluid flow left turn
Fluid flow neutral position
Fluid flow right turn
Front axle and differential assembly
Front axle and differential disassembly
Full time front wheel drive (locked down)
General information
Gerotor pump
Lubrication
Manual operation
Overhaul
Power steering control motor
Power steering description and operation
Power steering operation
Power steering pump
Power steering pump and reservoir tank
Power steering pump assembly
Power steering pump disassembly
Power steering pump inspection and repair
Power steering pump pressure testing
Power steering pump removal
Pressure testing
Reduction gear box assembly
Reduction gear disassembly
Reduction gear inspection and repair
Relief valve
Relief valve pressure testing
Reservoir tank
Ring gear-to-pinion backlash check and adjustment
Sensitrack assembly
Sensitrack disassembly
Sensitrack inspection and repair
Sensitrack removal
Special tools
Specifications
Spool and sleeve
Steering control motor assembly
Steering control motor disassembly
Steering control motor inspection
Steering control motor installation
Steering control motor pressure testing
Steering control motor removal
Steering cylinder assembly
Steering cylinder disassembly
Steering cylinder inspection
Steering cylinder installation
Steering cylinder pressure testing
Steering cylinder removal
Steering cylinders
Steering tubes
SuperSteer automatic position (disengaged)
SuperSteer automatic position (engaged)
SuperSteer description and operation
SuperSteer front axle
SuperSteer, front axle, and sensitrack
SuperSteer full time front wheel drive (locked down)
Troubleshooting

WHEELS AND TIRES
Front tire inflation pressures
Liquid ballast
Rear axle tread setting
Rear tire inflation pressures
Rear wheel weight installation
Tire pressure
Tractor weighting
Tread setting – FWD
Tread setting – 2WD
Wheel nut torque specification
Weighting for stability
Weighting limitations
Wheels and tires

SEPARATING THE TRACTOR
Front axle
Front axle support installation
Front axle support removal
Front wheel drive front axle installation
Front wheel drive front axle removal
9×3 Gear transmission
9×3 Gear transmission installation
9×3 Gear transmission removal
Hydrostatic gearbox and unit installation
Hydrostatic gearbox removal
Hydrostatic transmission
Hydrostatic unit removal
Installation after separation between the front axle support and engine
Rear axle and center housing
Rear axle and center housing installation
Rear axle and center housing removal
Separating the tractor between the clutch housing, front 9×3 gear transmission
housing, and the rear axle center housing Separating the tractor between the clutch
housing, hydrostatic transmission, and the rear axle center housing
Separating the tractor between the engine and clutch housing
Separating the tractor between the front axle and the axle support
Separating the tractor between the front axle support and engine
Separating the tractor between the rear axle and center housing
Supersteer front axle installation
Supersteer front axle removal
Two-wheel drive front axle installation
Two-wheel drive front axle removal

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1925 ford tractor pto problems