Tackling a complete transmission teardown on your Fiat tractor? This 239-page Fiat 45-66 workshop manual pdf (OEM #603.54.228.02) covers the entire 45-66 family, including the 45-66 DT, 45-66 V, 45-66 DTV, and 466 variants. Inside, you get complete electrical wiring diagrams, exploded views of the transmission and splitter, and a full hydraulic lift troubleshooting chart. Open to the power train section for step-by-step procedures on Valeo and Luk clutch overhauls, bevel drive adjustments, and no-spin differential rebuilding. Calibrate your injection pump timing to exact factory data and verify the front wheel drive king pin bearing adjustment before bolting the live front axle back together. Your bay time is too valuable for guesswork. Download this bookmarked, searchable PDF directly to your tablet and find the right spec in seconds.
What's Inside This Fiat 45-66 to 80-66 Series Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 4 | Contents, General Instructions, Safety Precautions, Identification Data, Weights |
| Specifications | 4 | Engine, Power Train, Hydraulic Lift, Electrical System, Fluid Capacities |
| Engine: Specifications and Data | 4 | Engine Block, Crank Gear, Valve Gear, Fuel System, Torque Data |
| Engine: Description - Performance Data - Removal - Installation | 4-5 | Description, Performance Data, Compression Test, Removal-Installation |
| Engine: Fuel System | 16 | Injection Pump Removal, Installation, Timing, Calibration Data |
| Power Train: Specifications and Data | 4 | Clutches, Transmission and Splitter, Bevel Drive and Differential, Brakes, Power Take-Off |
| Power Train: Clutch | 4 | Removal and Installation, Valeo Clutch Overhaul, Luk Clutch Adjustment, Clutch Control Adjustment |
| Power Train: Transmission and Splitter | 5 | Removal and Installation, Disassembly, Longitudinal and Cross Sections, Assembly |
| Power Train: Bevel Drive and Differential | 5 | Removal-Installation, Bevel Pinion Shaft, Bevel Drive Adjustment, Differential Lock |
| Power Train: Brakes | 5 | Brake Unit Assembly, Brake Pedal Adjustment, Parking Brake Lever Adjustment, Brake Operation |
| Front Axle-Steering: Specifications and Data | 5 | Front Axle, Manual Steering, Power Steering, Torque Data, King Pin Journal |
| Front Wheel Drive: Live Front Axle | 5 | Removal-Installation, King Pin Bearing Adjustment, Wheel Hub Bearing Adjustment, Bevel Drive Adjustment, No Spin Differential |
| Hydraulic Lift Unit: Specifications and Data | 6 | Lift, Lift Pump, Implement Attachment, Remote Control Valves, Lift Trouble Shooting Chart |
Fiat 45-66 to 80-66 Series Common Problems This Manual Covers
Fiat 55-66 hydraulic lift arms won't raise implement, lift pump sounds weak under load
Check the lift trouble shooting chart on page 6 before pulling the pump. Confirm oil level is correct and the remote control valve is fully seated, then crack the pressure line fitting to check for aeration. If flow is still low, pull the lift pump and check the relief valve spring and gear-to-housing clearance against the clearance specifications.
Manual Section: Hydraulic Lift Unit: Specifications and Data p. 6Engine cranks fine but won't start or misfires badly in cold, wet weather
Bleed the fuel system at the injection pump before chasing the injectors. Follow the injection pump timing procedure on page 16, checking pump-to-engine timing marks and delivery calibration data. Verify the fuel lift pump is passing fuel with no air in the line and check filter condition; a clogged element is the most common cause of hard starting.
Manual Section: Engine: Fuel System p. 16Clutch slips under heavy draft load even after pedal free-play adjustment
Recheck clutch pedal free travel first; if it's within spec and slip continues, pull the clutch cover and inspect the pressure plate fingers for uneven wear or a weak diaphragm spring. Measure friction disc thickness against wear limits and check the release bearing for drag. On Valeo units, verify release lever height is set evenly around the cover before reassembly.
Manual Section: Power Train: ClutchFront axle knuckle has excessive play, steering feels loose over rough ground
Jack the front axle and check king pin bearing endplay by hand before condemning the knuckle. Follow the king pin bearing adjustment procedure, torque the retaining nut to the value listed in the torque specifications, then recheck for play. Inspect the wheel hub bearings at the same time since worn hub bearings mimic king pin symptoms.
Manual Section: Front Wheel Drive: Live Front AxleTransmission grinds going into gear and driver can't find neutral cleanly
Verify clutch release is complete before blaming the gearbox; incomplete disengagement is the usual cause of gear clash. If the clutch checks out, drain the transmission and inspect the shift fork pads and synchronizer rings for wear. Check gear end float and shaft bearing preload against the technical specifications before reassembling the case.
Manual Section: Power Train: Transmission and SplitterFrequently Asked Questions
What are the torque specifications for the clutch to flywheel bolts on Fiat tractor?
The torque specification for the clutch to flywheel screws (C1, page 1) on the Fiat tractor is 25 Nm (2.6 kgm or 19 ft lb). These bolts have a thread size of M 8x1.25.
How will I receive this Fiat 45-66, 45-66 DT, 45-66 V, 45-66 DTV, 466, 566?
Instant PDF download (119 MB). You get the full 239-page searchable WORKSHOP MANUAL immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Is this Fiat 45-66, 45-66 DT, 45-66 V, 45-66 DTV, 466, 566, 666, 756, 55-66?
Yes, print as many copies as you want, and there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
Are electrical wiring diagrams included in this Fiat 45-66, 45-66 DT, 45-66 V?
Included. The Fiat 45-66, 45-66 DT, 45-66 V, 45-66 DTV, 466, 566, 666, 756, 55-66, 55-66 DT, 55-66 V, 55-66 DTV, 55-66 F, 55-66 DTF, 55-66 LP, 55-66 DT LP, 60-66, 60-66 DT, 60-66 F, 60-66 DTF, 60-66 LP, 60-66 DT LP, 65-66, 65-66 DT, 70-66, 70-66 DT, 70-66 F, 70-66 DTF, 70-66 LP, 70-66 DT LP, 80-66, 80-66 DT, 80-66 F, 80-66 DTF WORKSHOP MANUAL covers complete wiring harness diagrams, electrical circuits, and connector pinouts.
