1991 Massey Ferguson MF 3050, 3060, 3065, 3070, 3080, 3090, 3095, 3115, 3120, 3125, 3140 Tractor Workshop Service Manual (P/N 1646915 M1)

This 1991 Massey Ferguson workshop service manual, Publication No. 1646915 M1, covers the MF 3000 and MF 3100 series tractors listed above. Its fourteen sections document the chassis, powertrain, hydraulic systems and electronic controls.

• Tractor splitting and clutch service: Engine-to-gearbox and gearbox-to-rear-axle separation, with separate push-type and pull-type clutch procedures for Speedshift and Dynashift configurations.

• Gearbox repair: Mainshaft, layshaft and output-shaft service, reverse shuttle adjustment, creeper gears, and Speedshift and Dynashift planetary-carrier overhaul.

• Axles and PTO: Differential lock service, final drive units, wheel hubs, axle-bearing preload, independent PTO clutches and ground speed PTO configurations.

• Hydraulics and braking: Pump and circuit tests, Orbitrol steering-unit overhaul, auxiliary spool valves, brake master cylinders, and main and trailer brake bleeding.

• Electronic diagnosis: Electronic Lift Control sensor adjustment, Autotronic testing with and without the ETCU tester, and Datatronic TPM programming and harness checks.

• Cab air conditioning: Leak diagnosis, compressor service, evacuation, recharging and pressure checks for the documented R-12 system.

• Workshop reference: Wiring diagrams, hydraulic schematics, section views, exploded assemblies, adjustment tolerances, torque tables and service-tool references.

The manual was written to support Massey Ferguson distributors and dealers carrying out installation, maintenance and repair work; its procedures assume workshop equipment and the specified special tools.

Splitting, Engine Scope and Transmission Repair

The splitting sections distinguish the engine-to-gearbox connections used on the 3000 and 3100 tractors, including their Dynashift versions. Front-frame-to-engine separation and engine adaptor-plate service are also covered.

Engine coverage: Engine specifications, injection-timing data and viscous-fan operation are included. Internal engine adjustments and overhaul procedures are referred to separate Perkins engine manuals; this file does not replace those publications.

The gearbox material includes selector rails and forks, A/B range gears, synchronizers, selector-cover adjustment, and output-shaft shimming. Longitudinal sections, cross-section drawings and general arrangement views show how the gear trains and housings fit together.

The Hi/Lo sections identify the change from a synchronizer to a coupler and direct earlier units to a separate workshop manual, helping match the repair procedure to the installed range mechanism.

Speedshift instructions warn that incorrect planet-gear indexing can damage the unit. They also explain how damaged sealing rings can cause leakage and loss of operating pressure.

Axles, PTO and Hydraulic Circuits

Rear-axle coverage includes crownwheel and bevel-pinion adjustment, differential lock components, brake pistons and seals. PTO sections distinguish removable and shiftable shafts, economy PTO arrangements, and ground speed PTO assemblies for 2WD and 4WD tractors.

Front-axle sections cover standard and improved 4WD final drives and differentials, plus 2WD hubs, steering components and toe-in adjustment. Hydraulic service extends to the Bosch pump, lift control valve, and Rexroth and Bosch auxiliary spool valves.

The general hydraulic circuit diagrams show how steering, transmission controls and lift functions are supplied. High-flow and low-flow test sections provide the related pressure and flow checks.

Always verify the safety procedures and pressure relief precautions before starting a teardown or splitting the tractor.

Electronic Controls and Wiring Diagrams

Electronic Lift Control coverage includes voltage and resistance checks, connector continuity, potentiometer tests and position-sensor adjustment. Wiring diagrams distinguish systems with and without quick soil engagement.

Autotronic diagnosis uses ETCU tester 3584002 M92 to distinguish missing input signals, control-unit output faults and downstream circuit problems. That separation helps narrow a failed function before replacing the control unit.

Datatronic material covers TPM operation and programming, fuel-flowmeter and radar checks, and harness testing. Electrical layouts include instrument-panel and engine-area wiring for Thermostart and Etherstart, regional lighting circuits, and Dynashift diagrams with and without a temperature sensor.

Chassis Data and Service Tools

Chassis mounting dimensions, lift-capacity charts, final-reduction ratios, sealant guidance and conversion tables support the component procedures. The service-tool section identifies tools by number and application, including clutch centralizer MF 457 and hydraulic test equipment MF 3001.

Examples from the Valve and Cooling Tables

These values are a small selection of the manual's engine and cooling specifications.

The engine table distinguishes cold intake valve clearance by engine group: 0.30 mm (0.012 in) for the four-cylinder Perkins engines and 0.20 mm (0.008 in) for the six-cylinder engines.

The cooling-system specifications list thermostat opening at 83°C (182°F).

PDF Search, Section Bookmarks and Page Count

Search and circuit detail: OCR text search is available through much of the body text, with gaps on covers, section dividers and some diagram labels. Embedded bookmarks open the main section dividers. Small wiring labels require magnification; some labels and lines in the Germany lighting diagram remain faint when enlarged.

Delivered as one printable, 822-page PDF in English. The page count includes one added cover page, the original title and contents pages, section dividers and blank pages.