Part of the New Holland Repair Manuals.
A combine that quits threshing in the second week of harvest does not wait for a dealer appointment, and this New Holland TX66, TX68 repair manual PDF exists for exactly that moment: 980 pages of factory service data, OEM ID 86603389, also covering the TX62, TX64, TX65 and TX67. Electrical circuit diagrams take up more of the book than any other section, tracing starter, header lift and straw chopper engagement wiring pin by pin, backed by full hydraulic and hydrostatic schematics. Troubleshooting charts walk you from a hydrostatic drive fault or a header height complaint to the cause, and InfoView error codes plus calibration procedures close out the book. Set the variator belt tension spring at 66 mm and pull 440 Nm for the final drive bolts from the same tables your dealer uses. Guess a torque on a final drive and you shear a hub mid-field. Bookmarked and text searchable, the PDF rides in the cab or the shop, wherever the machine happens to stop.
What's Inside This New Holland TX66, TX68 Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 5-18 | Machine Serial Numbers, Tightening Torques |
| Traction and Steering Axle | 19-74 | Traction Gearbox, Brakes, Final Drives |
| Grain Header | 75-94 | Reel, Knife and Wobble Box, Feed Auger |
| Straw Elevator | 95-114 | Straw Elevator Chain, Upper Shaft, Bottom Shaft |
| Threshing | 115-126 | Concave Adjustments, Threshing Drum, Drum Variator |
| Separation | 127-148 | Concaves, Intermediate Shaft, Beater Shaft |
| Cleaning | 149-180 | Cleaning Fan and Variator, Cleaning Shoe Drive, Shaker Shoe |
| Grain Storage | 181-202 | Unloading System, Clean Grain Transport System, Return System |
| Straw Chopper/Chaff Spreader | 203-224 | Straw Chopper, Rotor Bearings, Straw Chopper Clutch |
| Engines | 225-234 | Fuel Injection Pump, Fuel Injectors, Cooling System |
| Air Conditioning | 235-246 | Air Conditioning Circuit, Ventilation Unit, Compressor Clutch Replacement |
| Hydraulic System | 247-312 | Hydraulic Pump, Header Height Control Valve, Hydraulic Cylinders |
| Hydrostatic System | 313-400 | Hydrostatic Pump, Hydrostatic Motor |
| Electrical System General Information | 401-420 | Wiring Identification, Color Codes, Relays, Connector Pinouts |
| Electrical Symbols and Diagrams | 421-446 | Electrical Symbols, Wiring Diagrams, Connector Diagrams, Component Identification |
| Electrical Circuit Diagrams | 447-716 | Starter Circuits, Hydrostatic System, Engine Throttle, Header Lift Control, Straw Chopper Engagement |
| Troubleshooting and Diagnostics | 717-888 | Hydrostatic Drive, Throttle Control, Straw Chopper Engagement, Header Lift Control, Lateral Float Control |
| Self-Diagnostic Error Reports | 889-932 | InfoView Monitor Errors, Header Height Control Errors, Remote Gearshift Errors, Sensor Error Codes |
| Calibration Procedures | 933-980 | InfoView Monitor Calibration, Header Calibration, Ground Speed Calibration, Returns Constant Calibration |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Bolts G (final drive) | 440 Nm | p. 46 |
| Torque E | 100 Nm | p. 46 |
| Torque D | 80 Nm | p. 46 |
| Sprockets B and C mounting hardware torque | 100 Nm | p. 79 |
| Variator belt tension spring C length | 66 mm | p. 77 |
| Reel variator dimension at upper shaft B | 51 mm | p. 77 |
| Length of spring K (Cereal crops, models with lateral float) | 112 mm | p. 104 |
| Distance between variator arms 5 and 14 | 190 mm | p. 123 |
| Variator belt tension dimension A | 0 mm | p. 123 |
| Input shaft L rotation moment | 2 Nm to 4 Nm | p. 166 |
| Output shaft A rotation moment | 0.25 Nm to 0.55 Nm | p. 166 |
| High pressure switch cut-in set point | 2.8 bar ± 1.5 bar | p. 238 |
New Holland TX66, TX68 Common Problems This Manual Covers
New Holland TX66 header and reel hydraulics dead, pressure switch on valve stack clicking, no response
Check the cab fuses first, then test for current at the valve spool connector with the function switched on. Replace the hydraulic pressure switch on the valve stack if the micro switch inside has failed; they fail often. Verify the relief valve opens at 160 bar per the spec on page 261 before blaming the pump.
Manual Section: Hydraulic System p. 261Drum variator belt slips under heavy crop load, drum speed drops and threshing stalls
Inspect the vari-drive belt for glazing and deformation, then reset the variator using the procedure on page 123: set the distance between variator arms 5 and 14 to 190 mm, and dimension A to 0 mm. Run the drum through its full range and confirm the intermediate shaft holds 800 rpm per page 124. Replace any belt that still slips.
Manual Section: Threshing p. 123Straw chopper clutch will not engage, solenoid clicks but rotor never comes up to speed
Test the engage solenoid for a short before condemning the clutch; they burn out on these machines. Check chopper gearbox oil, capacity is 0.9 L per page 86, and inspect rotor bearings while the belt is off. Torque the clutch mounting hardware to 100 Nm from page 78 during reassembly.
Manual Section: Straw Chopper/Chaff Spreader p. 203Error code 130 on the monitor, reel speed control cuts out when threshing engaged
Check the reel speed sensor connector at the header first; code 130 means the sensor dropped off while threshing was engaged. Work through the error report procedure starting on page 889, then recalibrate the header per page 933. If manual reel speed still hunts, set variator tension spring C to 66 mm per page 77.
Manual Section: Self-Diagnostic Error Reports p. 889Self leveling shoe drive gearbox growls at high hours, cleaning shoe shakes unevenly
Drain the gearbox and pull the covers before harvest, not during it. Measure backlash between gears G and N; page 168 calls for 0.1 mm to 0.6 mm at distance X. Set input shaft L rotation moment between 2 Nm and 4 Nm per page 166, and torque elastic coupling C nuts to 61 Nm from page 169.
Manual Section: Cleaning p. 166Frequently Asked Questions
How do you clear an error report on the InfoView monitor?
An error report can be cleared by pressing the 'Escape' button while the error is displayed on the screen, provided the engine is not running. This will disable the error report system until the engine is started again. After a repair, some error reports may appear once more when turning on the ignition for the first time, but this does not indicate the concern was not correctly repaired. p. 890
What is the torque spec for the M10 bolts on the New Holland TX66, TX68 combine traction gearbox cover?
According to the tightening torques table for metric hardware, the torque specification for a plated M10 bolt of property class 8-8 is 56 Nm. p. 11
What is the oil capacity and specification for the traction gearbox on a New Holland TX66, TX68 combine?
The traction gearbox has a capacity of 15 litres. The recommended oil is AMBRA Hypoid 90 (ref. NH520A) or an oil meeting API-GL-5 or MIL-L-2105 D specifications with a viscosity grade of SAE 80W-90. p. 22
What is the valve clearance specification for the IVECO AIFO 8460 engine in the New Holland TX66, TX68 combine?
The running valve clearance for the IVECO AIFO 8460 engine is 0.25 mm for intake valves and 0.50 mm for exhaust valves. p. 231
How often should the traction gearbox oil be changed?
The traction gearbox oil should be changed after the first 100 operating hours, then after 200 operating hours, and thereafter every 400 operating hours or annually. p. 22
Will this New Holland TX66 Repair Manual download right away?
You download the Repair Manual yourself: 980 pages, searchable PDF, available immediately. Keep a copy on every device you use.
Are there any print restrictions on this New Holland TX66 manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Reviews
There are no reviews yet.