Part of the New Holland Operator Manuals.
Bleeding air out of the fuel system on a 66S series tractor takes five minutes when you know which screws to crack first, and half a morning when you are guessing. This 117 page operator manual walks the New Holland 55-66S, 60-66S, 65-66S, 70-66S and 80-66S, plus the 70-66 and 80-66 high-clearance versions, end to end: controls and instruments, the PTO and ground-speed PTO, hydraulic lift and implement hitch, track adjustment, ballasting and the full maintenance schedule.
Separate chapters cover the four-wheel drive front axle, creeper and reverser gearboxes, the 40 km/h version and its brakes, high-clearance row-crop models and the heated and ventilated cab, with engine, transmission and hydraulic lift specifications gathered in one section.
Guessing costs money: the wrong lift setting can mean a bent implement and a second teardown, and a mistimed repair can cost a weather window. Buy it once, download the PDF and keep it in the shop for the life of the tractor.
What's Inside This New Holland 66S & 66 HC Series Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| Work Safely | 4 | Warning Signs, Safety Rules, Traffic Regulations, Accident Prevention |
| Safety Decals | 5 | Engine Stop, PTO Shaft, PTO Clutch Control Lever, Operator Instrument Panel |
| Service | 6-8 | Dealer Network, Repair, Overhaul, Skilled Servicemen |
| Identification Data | 9 | Frame Type, Serial Number, Engine Type, Identification Plate |
| Safety Precautions | 10-15 | Engine Gaskets, Asbestos Powder, First Aid Kit, Rotating Parts, Power Take-Off Shielding |
| Controls and Instruments | 16-23 | Instrument Panel, Control Board, Transmission and Splitter, Transmission and Reverser |
| Operation | 24-59 | Starting and Stopping, Seat Adjustment, Power Take-Off, Ground-Speed Power Take-Off, Hydraulic Lift, Guide to Lift Operation, Hydraulic Lift Implement Hitch, Lower Link Settings |
| Maintenance | 60-70 | Maintenance Schedule, Engine Cooling Plant, Fuel System Bleeding, Electrical System (Battery, Starting Notes, Fuses, Headlamp Alignment) |
| Specifications | 71-78 | Engine Specifications, Transmission Specifications, Hydraulic Lift Specifications |
| Four-Wheel Drive Tractors | 79-83 | Front Axle, Drive Shaft, Bevel Drive, Planetary Final Drives, Steering |
| Creeper Speed and Reverser Tractors | 84-85 | Synchromesh Reverser, Creeper Speed Unit, Control Levers, Gear Ratios |
| Reverser Tractors | 86 | Splitter-Reverser Unit, Control Lever, Reverse Gear Range, Tractor Speeds |
| Km/H Version | 87-93 | Brakes |
| High-Clearance Tractors | 94-97 | Hydraulic Lift Implement Hitch, Track Width Adjustment, Front Tracks, Rear Tracks, Fuel System |
| Dt Version | 98-100 | Live Front Axle, Steering, Front Wheel Drive Operation, Front Track Adjustment, Self-Locking Differential |
| Heated and Ventilated Cab Version | 101-108 | Cab Doors and Windows, Cab Interior Maintenance |
| Optionals - Variants and Accessories | 109-117 | Mechanical Reverser, Creeper Speed Box, Power Take-Off, Remote Control Valves, Trailer Hydraulic Brake Valve, ROPS Frame |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Solvay soda proportion for system flushing | 250 grams of soda every 10 liters of water | p. 62 |
| Battery capacity (3-cylinder engine models) | 90/100 Ah | p. 66 |
| Battery capacity (4-cylinder engine models) | 100/132 Ah | p. 66 |
| Tightening torque of wheel-to-hub nuts | 260 Nm | p. 81 |
| Tightening torque of disc-to-rim nut | 216 Nm | p. 81 |
| Starting motor output (models 65-66S, 70-66S, 80-66S) | 3.5 kW | p. 78 |
| Starting motor output (models 55-66S, 60-66S) | 2.5 kW | p. 78 |
| Hydraulic pump output | 32.8 l/min | p. 75 |
| Hydraulic pump relief valve pressure setting | 186 bar | p. 73 |
| rim-to-disc nuts torque | 205 to 245 Nm (152 to 181 ft.lb) | p. 95 |
| disc-to-hub nuts torque | 255 Nm (188 ft.lb) | p. 95 |
| Engine Oil Change Interval | 200 hours | p. 61 |
New Holland 66S & 66 HC Series Common Problems This Manual Covers
Engine dies after fuel filter service
Air trapped in the lines after a filter change or a run-dry tank keeps the engine cranking without firing. The Maintenance chapter gives the fuel system bleeding procedure so you purge it in one pass and get back to work.
Manual Section: Maintenance p. 60Hydraulic lift drops or will not raise
A lift that lets the plow sink or refuses to pick up usually traces to draft and position control settings rather than a worn pump. The Operation chapter walks lift operation, the implement hitch and lower link settings step by step.
Manual Section: Operation p. 24Front axle noise on 4WD tractors
Whine or clunk from the front end of a four-wheel drive model can come from the drive shaft, bevel drive or planetary final drives. The Four-Wheel Drive Tractors chapter covers the front axle and steering for these versions.
Manual Section: Four-Wheel Drive Tractors p. 79Weak brakes on 40 km/h tractors
The faster road-speed version carries its own brake setup, and pedal feel that would pass on a field tractor is not enough at 40 km/h. This chapter covers the brakes specific to that version.
Manual Section: Km/H Version p. 87Reverser or creeper hard to engage
Balky shifts into reverse or crawl often come down to using the control levers in the wrong sequence rather than gearbox wear. This chapter explains the synchromesh reverser, the creeper speed unit and the gear ratios behind each range.
Manual Section: Creeper Speed and Reverser Tractors p. 84Track width wrong for row crops
Running the wrong front or rear track width on a high-clearance tractor puts tires on the rows and stresses the axles. The High-Clearance Tractors chapter covers track width adjustment for the front and rear, plus the implement hitch and fuel system on these models.
Manual Section: High-Clearance Tractors p. 94Frequently Asked Questions
Which tractors does this manual cover?
It covers the New Holland 55-66S, 60-66S, 65-66S, 70-66S and 80-66S, plus the 70-66 HC and 80-66 HC high-clearance versions. Dedicated chapters handle the four-wheel drive, DT, creeper, reverser, 40 km/h and heated cab variants. OEM publication number 603.64.286.00.
Does it include the factory maintenance schedule?
Yes. The Maintenance chapter opens with the full schedule and works through the engine cooling plant, fuel system bleeding and the electrical system, including battery care, fuses and headlamp alignment. p. 60
Are the four-wheel drive versions covered?
Yes. The Four-Wheel Drive Tractors chapter covers the front axle, drive shaft, bevel drive, planetary final drives and steering, and a separate DT Version chapter adds the live front axle, front track adjustment and self-locking differential. p. 79
Does it list hydraulic and engine specifications?
Yes. The Specifications chapter gathers engine, transmission and hydraulic lift data, including the lift relief valve setting of 186 bar and the 0.30 mm valve clearance for intake and exhaust. p. 71
Will this New Holland 55-66S Operator Manual download right away?
You download the Operator Manual yourself: 117 pages, searchable PDF, available immediately. Keep a copy on every device you use.
Does this New Holland 55-66S manual allow printing?
Printing is allowed without restriction. Pull the pages you need for the job and bin them when they get greasy.
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