1960–1970 Fiat Trattori 580, 580 DT, 680, 680 DT Tractor Workshop Manual (P/N 603.54.202)

This Fiat Trattori workshop manual covers the 1960–1970 580, 580 DT, 680, and 680 DT tractors, with specifications for the 680H and 680H DT heavy-duty versions. Publication 603.54.202, issued September 1979, contains factory repair data, component adjustments, and workshop test information.

• Engine inspection: Cylinder-block and cylinder-head dimensions, crankshaft and bearing clearances, valve adjustment, timing references, and 680 dynamic-balancer timing.

• Fuel injection: Bosch and C.A.V. pump calibration sheets, injector specifications, assembly data, and bench-test plans with equipment requirements.

• Powertrain repair: Ferodo, LUK, and O.M.G. clutch overhaul, synchromesh assembly, bevel-drive setup, differential-lock adjustment, and mechanical-reverser sections.

• Brakes and steering: Hydraulic brake bleeding, master-cylinder bench testing, manual and power-steering overhaul, front-axle adjustments, and steering troubleshooting charts.

• Hydraulic lift: Lift-control adjustment, pump overhaul and output testing, relief and unload-valve checks, and remote-control valve testing.

• Electrical systems: Starter and alternator test data, instrument and switch references, and wiring diagrams for tractors with and without accessories.

The procedures suit mechanics familiar with precision measurements, clutch fixtures, and hydraulic or injection-pump test equipment.

Engine Inspection and Injection-Pump Calibration

The engine section provides sleeve and piston fits, cylinder-head geometry, crankshaft inspection limits, bore and stroke dimensions, and valve-clearance data. It also describes valve-gear timing and the 680 dynamic balancer.

Cooling-system and lubrication-system diagrams accompany water-pump and oil-pump specifications. The engine longitudinal sections listed in the contents are not included in this PDF.

Pump calibration: Separate test plans cover the 580 C.A.V. pump and the 680 Bosch and C.A.V. pumps. They identify test-machine arrangements, calibration-fluid conditions, delivery checks, governor settings, and timing references.

Clutches, Transmission, and Brake Testing

Clutch procedures distinguish Ferodo, LUK, and O.M.G. assemblies, including friction-surface inspection and release-lever adjustment on the bench or flywheel. Referenced equipment includes universal clutch fixture 293650.

Powertrain schematics and sections cover splitter gears, crawler gears, the mechanical reverser, planetary final drives, and PTO assemblies. Bevel-drive procedures address pinion position, bearing preload, backlash, and differential-lock setup, with gauge 293400/1 identified for positioning work.

The brake section explains separate and combined pedal operation and provides master-cylinder leakage, check-valve, and compensating-valve tests. General fitting instructions cover shim measurement, rotary shaft seals, O-rings, and sealing compounds.

Always follow workshop safety procedures when lifting or supporting heavy tractor assemblies.

Burman and Danfoss Steering Systems

Burman manual-steering overhaul includes worm-bearing and rocker-shaft adjustment. Danfoss power-steering coverage adds hydraulic testing, bleeding, operating diagrams, and fault/cause/remedy charts.

Cylinder differences: Weber cylinders have full disassembly instructions; Calzoni and Sima procedures address piston-rod removal and seal replacement. The power-steering overhaul notes warn that striking the rotary-valve sheet-metal cap can cause leakage requiring replacement of the steering unit.

Live-front-axle procedures distinguish A.M. and P.M. arrangements for kingpin bearings, wheel bearings, bevel-drive adjustment, and drive-shaft alignment.

Lift Controls, Pumps, and Remote Valves

Hydraulic coverage distinguishes the 580 lift from the 680-type lift, which was also optional on the smaller models. Frame-specific cross-shaft and draft-control drawings help match the component arrangement to the tractor before choosing adjustment procedures.

The lift chapter includes response, travel, and sensing-bar adjustments, plus hydraulic-system diagrams and troubleshooting charts. The lift-operation sheets numbered 501/3–4 in the contents are not included in this PDF.

Pump and valve work: FIAT A22X and A25X pump sections provide overhaul information and output-test charts. Refitting notes address priming because inadequate initial lubrication can cause pump seizure.

Remote-control valve coverage includes disassembly, relief-valve adjustment, spool-return testing, and leakage testing. The hydraulic lift and remote valves cannot operate simultaneously. The auxiliary lift-cylinder section specifies the optional 680H application.

Starting, Charging, and Wiring

Electrical data distinguish Marelli, Bosch, and Lucas starter applications, with solenoid checks, mechanical inspection limits, and bench-test specifications. Alternator and regulator data accompany fuse assignments and switch-circuit references.

Separate wiring diagrams show tractors with and without accessories, supported by component legends and cable-color codes. The electrical section also covers the C.A.V. injection-pump start-retard device.

Selected Engine and Rear Final-Drive Specifications

These figures are a small selection from the manual’s engine and driveline data. The main-bearing-cap screw specification is 147 Nm (108 ft lb) for both model families; cylinder-head tightening is described separately as a staged procedure.

Engine oil pressure is specified at 2.9–3.9 bar (42.6–56.9 psi) with the engine warm and running at governed speed.

The rear planetary final-drive reduction is listed as 5.785:1 for the 580 and 680, including their DT versions.

Reading the PDF and Supplement

Text access and drawing detail: The technical content is not searchable, and there are no embedded PDF bookmarks. Small wiring labels require zooming; lettering in the Start-pilot inset is faint. Some larger sectional drawings extend across multiple PDF pages.

Supplied as one printable English PDF with 192 pages: 178 pages in the main section and a 14-page supplement containing additional powertrain drawings and remote-valve material. The total includes the main cover and front matter, the supplement divider, and 17 blank pages—14 in the main section and three in the supplement.