Fiat wrote this 106-page operator manual, OEM 603.64.039.00, to put the 55-90 and 60-90 tractors to work properly, and it is offered here as the complete Fiat 55-90 operator manual PDF. Wiring diagrams trace the alternator, starter, gauges, and lighting circuits, while the guide to lift operation matches hitch setup to moldboard ploughs, sub-soilers, seed drills, and manure spreaders. DT variants get their own chapters: 20-speed, reverser, no-spin, and the three cab versions. Set master clutch pedal free travel at 190 mm (7 1/2 in) on open platform tractors, and expect 26.5 liters per minute rated output from a healthy hydraulic pump. Out there it is just you, the tractor, and nobody to ask. Bookmarks and a real text layer land you on the servicing chart or a wiring diagram in seconds, before the weather turns.
What's Inside This Fiat 55-90, 60-90, 55-90 DT, 60-90 DT Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| Service | 4-12 | Authorized Shops, Repair Work, Overhaul Work, Tractor Operation |
| Tractor Identification Data | 13 | Tractor Data Plate, Engine Type, Engine Number |
| Safety Precautions | 14-19 | Safety Alert Sign, Safety Decals, PTO Shaft Shielding, Roll-Over Protection, Fire Extinguisher, Fuel Handling |
| Controls and Instruments | 20-25 | Control Board, Master Clutch Lever, PTO Clutch Lever, Hydraulic Lift Controls, Parking Brake Lever, Throttle Lever, Differential Lock Pedal, Gear Lever |
| Operation | 26-36 | Engine Starting, Starting and Stopping, Transmission and Splitter |
| Guide to Lift Operation | 37-51 | Moldboard Ploughs, Disc Ploughs, Sub-Soiler, Ditchers, Cultivators, Weeders, Seed Drills, Manure Spreaders |
| Servicing Schedule | 52-54 | Adjustments, Level Checks, Fluid Change, Filter Change |
| Wiring Diagram | 55-59 | Headlamps, Alternator, Battery, Starter, Multiple Gauge, Fuel Gauge, Turn Signal Lights, Stop Lights |
| Electrical System | 60-63 | Battery, Electrolyte Level, Hydrometer, Alternator, Regulator, Fuses, Headlamp Alignment |
| Specification | 64-69 | Engine, Cooling System, Drive Train, Power Take-Off, Lift, Steering, Wheels and Tires |
| DT and 60-90 DT Tractors | 70-101 | 20-Speed Version, Reverser Version, No-Spin Version, Heated and Ventilated Comfort Cab Version, Heated and Ventilated Supercomfort Cab Version |
| Tractor Storage | 102 | Engine |
| Servicing Chart | 106 |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Clamp bolts 1 and 2 torque | 220 N·m, 22.5 kgm or 163 ft.lb | p. 46 |
| Master clutch pedal free travel | 190 mm or 7 1/2 in (170 mm or 6 3/4 in for tractors with cab) | p. 52 |
| P.T.O. clutch withdrawal lever pin travel | 3.5 mm or 0.138 in | p. 52 |
| Hydraulic pump rated output | 26.5 liter/min (5.8 Gall/min) | p. 68 |
| Hydraulic pump governed output | 15 liter/min (3.3 Gall/min) | p. 68 |
| Steering pump relief valve setting (2-wheel drive) | 100 bar (102 kg/cm² or 1451 psi) | p. 68 |
| Steering pump relief valve setting (4-wheel drive) | 125 bar (127.5 kg/cm² or 1813 psi) | p. 68 |
| Engine Oil Change Interval | 200 hours | p. 53 |
| Front Track Adjustment Bolts Torque | 220 N·m | p. 46 |
| Front Track Adjustment Clamp Bolt Torque | 39 N·m | p. 46 |
| Wheel Nut Torque | 294 N·m | p. 46 |
| Maximum Operating Weight | 3500 kg | p. 48 |
Fiat 55-90, 60-90, 55-90 DT, 60-90 DT Common Problems This Manual Covers
Fiat 55-90 clutch slipping under load, pedal feels spongy and tractor creeps with pedal fully depressed
Check master clutch pedal free travel against the 190 mm figure in the maintenance schedule on page 52; tractors with a cab call for 170 mm. Adjust the linkage until free travel is correct before blaming the clutch itself. If slipping continues after adjustment, have your dealer inspect the clutch pack.
Manual Section: Guide to Lift Operation p. 52Engine won't start or cranks slowly in cold weather, white smoke on startup
Check the cold weather starting procedure on page 26 and use the thermostarter or start-pilot as described instead of long cranking. Verify engine oil is inside the 200 hour change interval, since old thick oil drags the starter in frost. Clean battery terminals and check electrolyte level before the season turns.
Manual Section: Operation p. 26Hydraulic lift raises implement slowly and steering feels heavy at low engine speed
Check hydraulic oil level and top up before anything else; a low reservoir starves the pump on slopes. Verify the oil and filter have been changed on schedule. If the lift still comes up slowly, have pump output tested against the 26.5 liter/min rated figure listed on page 68 before harvest catches you.
Manual Section: Specification p. 68Engine runs rough at idle, loses power under load, misses after running out of fuel
Bleed air from the fuel lines using the procedure on page 58, which covers both CAV and BOSCH pump engines, especially after running the tank dry. If the miss stays, check valve clearances against the servicing schedule on page 52: 0.25 mm intake and 0.35 mm exhaust. Sort it before planting, not during.
Manual Section: Fuel System Bleeding p. 58Front wheels wobble and wheel nuts work loose after adjusting front track width
Torque wheel nuts to 294 N·m (216 ft.lb) any time the track has been changed, then recheck them after the first field pass. Verify beam clamp bolts 1 and 2 are tightened to 220 N·m and clamp bolt 3 to 39 N·m per the track adjustment steps on page 46.
Manual Section: Guide to Lift Operation p. 46Frequently Asked Questions
What is the correct valve clearance for the Fiat 55-90 and 60-90 engine?
The engine valve clearance is 0.25 mm (0.010 in) for the intake and 0.35 mm (0.014 in) for the exhaust. p. 52
What is the torque specification for the front axle beam extension clamp bolts on the Fiat 55-90 and 60-90?
The clamp bolts for the front axle beam extensions must be torqued to 220 N·m (22.5 kgm or 163 ft.lb). p. 46
What is the procedure for bleeding the fuel system on a CAV pump engine?
To bleed the fuel system, back off plug A by two turns and pump lever B until fuel is free of air bubbles, then repeat for plug C and screw D. Finally, back off screw D and hexagonal screw E, slacken the four connections F, and crank the engine until fuel is free of air. p. 58
What is the required fan belt deflection for the engine?
The fan belt deflection should be 10 to 11 mm (1/2 in) when applying a 78 to 98 N (8 to 10 kg or 18 to 22 lb) load. p. 52
What is the total cooling system capacity for the Fiat 55-90 and 60-90 with a cab?
Total cooling system capacity (including cab heater circuit) is 13 liters or about 3 gallons. p. 85
What format is this Fiat 55-90 manual in?
Instant PDF download. You get the full 106-page searchable Operator Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Can I print a copy of this Fiat 55-90 Operator Manual for the shop?
Yes. No DRM, nothing blocks printing, so run off the pages you need on whatever printer you have.
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