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This 216-page Fiat 780-780 DT, 880-880 DT Workshop Manual (OEM #603.54.201) covers every system on both tractor variants, from the 780 to the 880, in one factory-grade reference. Inside you get complete wiring diagrams for the electrical system, hydraulic schematics for the Lift Unit, and a dedicated torque figures section next to full teardown procedures for the engine, gearbox, and final drives. Set your fuel injector spray orifice diameter to .35 mm (.0137 in) and confirm 3 spray orifices before you button the pump back up, straight from the factory data. No more guessing whether that clearance spec applies to your 780 or the 880 DT variant. This searchable, bookmarked PDF opens on your phone or tablet, so you can jump straight to Power Train or Front Axle - Steering and start turning wrenches instead of flipping through a stack of paper in the shop.
What's Inside This Fiat 780 & 880 Series Manual
| System | Pages | Key Topics |
|---|---|---|
| Specification | 10-21 | Identification Data - Weights, Power Train - Brakes - Steering - Front Axle, Drive Train Diagrams, Front Axle - Rear Wheels - Power Take Off, Lift - Towing Attachments |
| Engine | 22-69 | Engine Block - Cylinder Head, Crank Gear, Valve Gear, Fuel System, Lubrication System, Cooling System |
| Power Train | 70-145 | Clutch, Gearbox and Splitter, Crawler Gear, Rear Bevel Drive and Differential, Brakes, Final Drives, Power Take-Off |
| Front Axle - Steering | 146-175 | Front Axle, Manual Steering, Power Steering |
| Hydraulic Lift Unit | 176-198 | Lift |
| Electrical System | 199-212 | - |
| Service Tools | 213-216 | - |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Air cleaner | Oil bath or dry, automatic drain centrifugal precleaner | p. 12 |
| Oil filters | Strainer on pump inlet and full flow cartridge on outlet | p. 12 |
| Hydraulic System Pump Rated pressure | ~18 kg/cm² (256 psi approx.) | p. 78 |
| Clutch (FERODO 11"/11") - PTO clutch control sleeve working clearance | .072 to .205 mm (.0028 to .0080 in) | p. 70 |
| Radiator cap pressure release valve setting | .5 kg/cm² (7 psi) | p. 68 |
| Service brake disc thickness | 10 mm (.394 in) | p. 77 |
| 780-780 DT | ||
| Number of spray orifices | 3 | p. 31 |
| Spray orifice diameter | .35 mm (.0137 in) | p. 75 |
| Clutch (FERODO 11"/11") - Transmission clutch control sleeve working clearance | .050 to .151 mm (.0020 to .0060 in) | p. 70 |
| 880-880 DT | ||
| Transmission drive shaft bearing shim thickness (up to frame 887700) | 2.8-4.3 mm (.110-.169 in) | p. 75 |
| Transmission drive shaft bearing shim thickness (frame 887701-889369) | 5.9-6.9 mm (.232-.272 in) | p. 75 |
Fiat 780 & 880 Series Common Problems This Manual Covers
Fiat 780-780 DT hydraulic system loses pressure after warm-up and implement response is slow
Remove the lift pump and inspect the internal components. Check the gear end clearance in the pump body with the bearings in position as shown on page 180. Replace parts if the clearance exceeds .1 to .2 mm (.004 to .008 in). Verify system rated pressure reaches 18 kg/cm² (256 psi).
Manual Section: Hydraulic Lift Unit p. 180Unexpected transmission slipping or failure to engage gears when shifting under load
Inspect the transmission clutch control sleeve working clearance. Adjust the Luk 11-inch clutch to maintain .050 to .151 mm (.0020 to .0060 in) clearance on 780 models. Torque the clutch to flywheel screws to 6 kgm (43 lbft) as detailed on page 81 to prevent further slipping.
Manual Section: Power Train p. 81Heavy steering feel or complete loss of power steering assist while turning
Test the power cylinder overload valve crack-off setting on page 148. Verify the valve opens at exactly 204 kg/cm² (2903.53 psi). Inspect the steering cylinder piston nuts and torque the power cylinder pivot pin nut to 30 kgm (217 lb ft) following the specifications on page 149.
Manual Section: Front Axle - Steering p. 148Engine overheating under heavy load and coolant leaking from upper hose connections
Drain the cooling system and inspect the radiator cap pressure release valve setting. Test the cap and replace it if it fails to hold .5 kg/cm² (7 psi) as specified on page 68. Refill the 880 model system with exactly 18 Litres of fresh coolant.
Manual Section: Engine p. 68Frequently Asked Questions
What are the torque specifications for the flywheel bolts on a Fiat 780 DT engine?
The flywheel bolts on the Fiat 780 tractor engine should be tightened to a torque of 12 kgm (87 lb ft). This specification applies to M 12 X 1.25 screws. p. 37
What is the engine oil capacity (with filter and lines) for the Fiat 780-780 DT?
The engine oil capacity for the Fiat 780-780 DT, including the filter and lines, is 11.7 litres (10.5 kg or 20 1/2 pints). p. 21
What is the tightening torque for the cylinder head bolts on a Fiat 780 tractor?
For the Fiat 780 tractor, the cylinder head screws (M 12 X 1.25) should be tightened in three stages, with the final torque being 15 kgm (108 lb ft). p. 47
What are the normal valve clearances for the inlet and exhaust valves on a Fiat 780-780 DT engine?
The normal valve clearance for the inlet valves on a Fiat 780-780 DT engine is .25 mm (.010 in), and for the exhaust valves, it is .35 mm (.014 in). p. 28
How will I receive this Fiat 780-780 DT, 880-880 DT Workshop Manual?
You get a 216-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Is this Fiat 780-780 DT, 880-880 DT Workshop Manual printable?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
Are there wiring harness diagrams in this Fiat 780-780 DT, 880-880 DT?
Complete wiring diagrams are included, covering all electrical circuits, harness routing, and connector pinouts for the Fiat 780-780 DT, 880-880 DT.
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