New Holland TF76 & TF78 Combine Service Repair Manual PDF Download

Description

New Holland TF76 / TF78 Combine Workshop Manual

This is the complete factory-authorized service and repair manual for the New Holland TF76 and TF78 twin-rotor combine harvesters. Designed for professional technicians and experienced owners, this manual provides the in-depth technical data, step-by-step procedures, and detailed specifications required to service, diagnose, and repair every major system on these complex machines. From overhauling the traction gearbox to calibrating the hydrostatic transmission and setting the fuel injection pump, this manual is your essential resource for maintaining peak performance and minimizing downtime.

Models & Equipment Covered

This manual is applicable to the following New Holland combine models:

• New Holland TF76 (Gear ratio 12/110)
• New Holland TF78 (Gear ratio 11/111)

Engine: IVECO 8460 SRI 21 A001

Available Headers: 19 ft Flex, 20 ft Grain, 24 ft Grain, 6-Row Maize

Main Systems & Subjects Included

This comprehensive manual covers all major systems and components, including:

• Traction Gearbox: Complete disassembly, reassembly, and adjustment of the gearbox, differential, and selector forks.
• Brake System: Servicing master cylinders, bleeding brakes, and replacing brake linings and handbrake components.
• Final Drives: Overhaul of final drive gearboxes for both standard and mud seal variants, including bearing and gear ratio procedures.
• Steering Axles: Complete service, torque specifications, and adjustment of fixed and steering axles.
• Grain Header: Detailed repair of the wobble box, feed auger (including retractable tines and slip clutch), reel drive and variator adjustment.
• Straw Elevator: Chain replacement, upper and lower shaft disassembly and assembly, and header drive shaft servicing.
• Engine: IVECO 8460 SRI fuel injection pump timing and removal, injector calibration, valve clearance adjustment, and coolant system service.
• Air Conditioning: Circuit specifications, refrigerant (R134a) handling, and compressor clutch replacement.
• Hydraulic System: In-depth coverage of the load-sensing system, stack valve operation and repair, steering valve, cylinder rebuilding, and accumulator charging.
• Hydrostatic Transmission: Comprehensive theory of operation, adjustment of multifunction valves, servovalve assembly, and pump/motor servicing.

Repair & Maintenance Coverage

This manual enables you to perform a full range of service and repair tasks:

• Step-by-step procedures for removing and installing major components (gearbox, final drives, steering axles).
• Detailed specifications, including tightening torques for all metric hardware and specialized fasteners.
• Fluid capacities, oil application guides, and lubrication schedules.
• Hydraulic schematic symbols and component location diagrams for efficient troubleshooting.
• Special tool requirements for specific overhaul tasks (e.g., gearbox bearing pullers).
• Diagnostic and adjustment procedures for the load-sensing hydraulic system and hydrostatic drive.

Why This Manual Is Useful

Owning this factory service manual provides the same detailed technical information used by New Holland dealerships. Whether you are performing a complex gearbox rebuild, diagnosing a hydraulic issue, or simply carrying out scheduled maintenance, this manual gives you the confidence and knowledge to do the job correctly. Avoid costly dealer repair bills and reduce machine downtime by having the definitive repair guide at your fingertips.

Instant PDF Download

This is a digital download in PDF format. Upon completion of your purchase, you will receive immediate access to the complete manual. The file is fully searchable and can be viewed on any device, including your computer, tablet, or smartphone.