Massey-Ferguson MF255 MF265 MF270 MF275 MF290 Tractor 1980 Service Manual (P/N 9780872885271)

• 95-page PDF covering Massey-Ferguson MF255, MF265, MF270, MF275, and MF290 wheel tractors, with four pages of metric/U.S. dual-dimension Condensed Service Data and 245 numbered service paragraphs.
• Perkins engine repair coverage includes the MF255 AG4.212 gasoline and early AD4.203 diesel, the MF265 AG4.236 gasoline, later MF255 and MF265/MF270 A4.236 diesels, and the MF275/MF290 A4.248 diesel.
• Steering and drivetrain procedures cover the adjustable front axle, wheel hubs, three power-steering pump designs, early and late hydrostatic hand-pump units, tractor splitting, dual and Split Torque clutches, and internal 8-speed and Multi-Power transmission repair.
• Rear chassis and PTO service includes differential and bevel-drive setup, planetary final drives, dry or wet disc brakes with mechanical or hydraulic actuation, live PTO, independent PTO clutch repair, and single- or dual-speed output assemblies.
• Hydraulic diagnosis and adjustment covers pressure-control and nonpressure-control lift systems, lift-linkage calibration, pump overhaul, selector and auxiliary valves, early and late auxiliary pumps, plus lift, auxiliary, Multi-Power, and IPTO pressure tests.
• Electrical and illustration support includes Delco-Remy, Lucas, and Perkins/Hitachi starting and charging systems, three model-specific wiring diagrams, and numbered photographs, section views, test hookups, and exploded assemblies through Figure 312.

This is a terse, bench-oriented shop manual rather than an operator's handbook. Its repair procedures are best suited to mechanics and experienced owners who already understand tractor splitting, heavy-component handling, precision measurement, hydraulic test equipment, and electrical troubleshooting.

Match the Engine and Build Before Ordering

The MF255 diesel coverage is build-sensitive: early tractors use the AD4.203 chapter, while later units are grouped with the A4.236. The A4.248 section distinguishes four-ring engines before engine S/N U839080J from three-ring engines beginning with U839080J. It also separates early and late balancer assemblies at engine S/N U880190K, and identifies the one-piece rear crankshaft seal by an "L" suffix in the engine serial number; earlier non-L engines use the two-piece rope seal.

Transmission and PTO configurations receive the same treatment. The standard gearbox is an 8-forward/2-reverse unit, while Multi-Power provides 12 forward and 4 reverse ratios. All five tractor models may use live or independent PTO. The independent system is covered in both single-speed form and the dual-speed version fitted to MF270 and MF290 tractors.

Engine, Drivetrain, and Hydraulic Repair Depth

Engine chapters include assembly removal and installation, cylinder-head service, valve and rocker work, timing gears and housings, camshaft, pistons and sleeves, connecting rods, crankshaft and bearings, rear seals, balancer units, and oil pumps. Diesel fuel coverage adds system bleeding, lift-pump repair, C.A.V. injector fault isolation, bench testing and overhaul, plus injection-pump removal and static timing. Internal injection-pump and governor overhaul is expressly outside the manual's scope because that work requires specialist test equipment and training.

Representative illustrations include the adjustable front axle assembly, early and late hydrostatic steering hand pumps, dual and Split Torque clutches, the 8-speed transmission gear train, the Multi-Power clutch pack, and pressure-control/nonpressure-control hydraulic lift pumps. The three wiring plates are divided into MF255/MF265 gasoline, MF255/MF265/MF275 diesel, and MF270/MF290 diesel systems.

The text names the setup tools used for higher-precision work, including MFN202C/MFN202D and tool 6179 clutch gauges, MFN850/MFN850A bearing and seal installers, and MFN970/MFN1050D lift-linkage gauges with Nuday 6088/6089 bushings. Condensed data covers component-specific torque specifications, fits and clearances, timing data, fluid capacities, pressure-test limits, wear limits, and adjustment settings.

The clutch section warns that driving the pivot-pin retainers fully out while the dual clutch remains assembled can damage the Belleville spring. During early engine-balancer disassembly, the shaft keys can damage frame bushings that are not separately serviced. Follow the manual's blocking, lifting, hydraulic-pressure-release, and injector-spray warnings before working on these systems.