This is the Fiat 45-66 and 45-66 DT Operator Manual, 88 pages covering these two-wheel and four-wheel-drive tractors and their 8035.06.220 and 8035.06.320 engines.It is the owner and operator book: identification data, the controls and instrument panel, and how to run the tractor day to day, from starting and stopping to the power take-off, hydraulic lift, lower link positions and towing attachments. It also covers routine maintenance and fuel system bleeding, the electrical system and battery, and a maintenance schedule with the key adjustments, clearances and torques. Separate sections describe the 45-66 DT four-wheel drive, the 20-speed creeper, the reverser and no-spin versions, full specifications and the wiring diagram.With it you can set clutch and brake free travel, bleed the fuel system, operate the lift and 4WD correctly, and keep to the service intervals. Delivered as a downloadable PDF for any device or printing.
What's Inside This Fiat 45-66, 45-66 DT Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| Service | 6-7 | Spare Parts |
| Panelling and Cab Maintenance | 8 | Weathering Protection, High Corrosion Resistant Steel Panellings, Painting Systems, Hardening Plastic Protective Coatings, Waxy Products, Paintwork Touchups |
| Identification Data | 9 | Tractor Data Plate, Engine Type and Number, Frame Type and Number |
| Controls and Instruments | 17-21 | Instrument Panel, Control Board, Splitter Control Lever, Master Clutch Pedal, Seat Ride Control Lever, PTO Control Lever, Tool Box, Parking Brake Lever |
| Operation | 22-49 | Starting and Stopping, Power Take-Off, Relative Ground Speed P.T.O., Hydraulic Lift, Lower Link Stroke, Towing Attachments |
| Maintenance | 50-51 | Cav Pump Engine, Fuel System Bleeding, Bosch Pump Engine |
| Electrical System | 52-54 | Starting Engine with Flat Battery or Without Battery, Battery, Fuses, Headlamp Alignment |
| Maintenance Schedule | 55-58 | Adjustments (Master Clutch Pedal Free Travel, Brakes Pedal Free Travel, Parking Brake Control, Fan Belt - Deflection, Master Clutch Outer Release Lever Pin Free Travel, Service and Parking Brakes, Engine Valves - Clearance, Fuel Injectors - Release Pressure, Starter) |
| Specifications | 59-63 | Weights, Speeds, Dimensions, Engine, Transmission, Hydraulic Lift |
| 45-66 Dt Four Wheel Drive | 64-68 | Foreword, Dimensions, Tractor Weight, Front Wheel Drive, Steering, Front Track Adjustment, Front Tracks |
| Speed Version | 69 | Creeper, Creeper Applied, To Engage Creeper, Tractor Speeds, With Engine at Governed Speed, Operating Weight |
| Reverser Version | 70 | Reverser Applied, Reverser Released, To Change Direction of Travel, Specification, Tractor Speeds |
| Dt-Tractor No-Spin Version | 71-73 | Printed in Italy, Copyright by Fiatgeotech S.p.A. |
| Running-In/ Flexible Maintenance | 85-87 | Flexible Maintenance |
| Wiring Diagram | 88 | Headlamps, Battery, Alternator, Fuses, Multiple Gauge, Cable Color Code |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Front wheel nuts torque | 147 N.m, 30 kgm or 108 ft lb | p. 44 |
| Rear wheel disc to hub screws torque | 255 Nm - 26 kgm or 188 ft lb | p. 46 |
| Master clutch pedal free travel | 25 mm (1 in) | p. 55 |
| Master clutch outer release lever pin free travel | 4,5 mm (0.18 in) | p. 55 |
| Fan belt deflection | 10 to 11 mm or 1/2 in applying a 78 to 98 N, 8 to 10 kg or 18 to 22 lb load | p. 55 |
| Engine Valves - Intake Clearance | 0.25 mm | p. 55 |
| Engine Valves - Exhaust Clearance | 0.35 mm | p. 55 |
| Fuel Injector Release Pressure | 230 to 238 bar | p. 55 |
| Engine Oil Capacity (Engine and filter) | 7.3 L | p. 86 |
| Cooling System Capacity | 14 L | p. 79 |
Fiat 45-66, 45-66 DT Common Problems This Manual Covers
Clutch slipping or borderline adjustment
On these tractors the clutch drifts to the edge of adjustment and begins to slip as it wears. The maintenance schedule gives the master clutch pedal free travel and release lever pin figures to reset it.
Manual Section: Maintenance Schedule p. 55Hard starting from air in the fuel system
Air drawn in after a filter change or fuel run-out leaves the engine cranking without firing. The maintenance section covers bleeding the CAV and Bosch pump fuel systems.
Manual Section: Maintenance p. 50Four-wheel drive not engaging on DT models
Weak or inconsistent 4WD engagement on the 45-66 DT usually points to linkage or adjustment wear. The DT section covers front-wheel-drive operation, the front axle and track adjustment.
Manual Section: 45-66 Dt Four Wheel Drive p. 64Flat battery or no-start electrical fault
A flat battery or poor connections stop the tractor cranking. The electrical section covers the battery, fuses, headlamp alignment and how to start with a flat or missing battery.
Manual Section: Electrical System p. 52Weak hydraulic lift or implement will not raise
A lift that struggles to raise implements is a common operator complaint on aging tractors. The operation section covers hydraulic lift use, lower link stroke and implement attachment.
Manual Section: Operation p. 22Fan belt slack causing overheating or weak charging
A loose fan belt lets the engine run hot and the battery fall behind. The maintenance schedule gives the correct fan belt deflection and the load to check it against.
Manual Section: Maintenance Schedule p. 55Frequently Asked Questions
Which tractors and engines does this manual cover?
It covers the Fiat 45-66 and the 45-66 DT four-wheel-drive tractors, with the 8035.06.220 and 8035.06.320 engines, including the 20-speed, reverser and no-spin versions.
Does it list engine adjustment specifications?
Yes. The maintenance schedule gives the key adjustment figures, such as intake valve clearance at 0.25 mm, exhaust at 0.35 mm, and fuel injector release pressure of 230 to 238 bar. p. 55
Does it cover the 45-66 DT four-wheel drive?
Yes. A dedicated section covers the 45-66 DT, including front-wheel-drive operation, dimensions, tractor weight, steering and front track adjustment. p. 64
Does it include a wiring diagram?
Yes. The manual ends with a wiring diagram showing the headlamps, battery, alternator, fuses, multiple gauge and the cable colour code. p. 88
What format is this manual in?
This is a 88-page searchable PDF ready for immediate download. Works on any device — pull it up on your phone while you're under the hood. No shipping, no waiting.
Am I able to print pages from this manual?
Yes, print as many copies as you want — there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
Are there wiring harness diagrams in this Fiat 45-66, 45-66 DT manual?
Yes — the manual includes a complete wiring diagram on page 88, plus a cab-version detail on page 80, showing the electrical system with cable color codes for the tractor's lights, fuses, battery, and gauges. This is an operator-level wiring diagram; full bench-repair electrical coverage is in the separate service manual.
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