1977-1981 Yanmar YM135D, YM155D, YM195D, YM240D, YM330D Shop Manual OEM

• Covers the 1977–1981 Yanmar YM135, YM155, YM195, YM240, and YM330 tractors, including D-series 4WD variants.
• Original OEM factory publication (P/N unlisted) sourced directly from the 1977–1981 production era.
• Features over 120 exploded-view diagrams of powertrain, hydraulic, and electrical assemblies.
• Documents official technical parameters for the 2T73A, 2TR13A, 2T84A, 2TR20A-X, and 3T84A engine series.
• Includes step-by-step instructions for a tractor split, injection pump timing, fuel system bleeding, hydraulic relief valve testing, injector nozzle testing, rockshaft calibration, and valve seat reconditioning to help avoid expensive dealer labor.
• Outlines component specifications for the power take-off (PTO), steering gear, brakes, governor, water pump, clutch linkage, and thermostart.

Essential Shop Data for Mechanics

This 62-page PDF reference provides the exact technical data required to service major tractor systems efficiently. Whether you run a commercial agricultural repair shop or are restoring a classic Yanmar in your home garage, this manual eliminates the guesswork. Chapters outline the essential parameters for engine overhauls, detailing specifications for the cylinder head, timing gears, and camshaft. The drive system section explores front-wheel drive mechanics, transmission assemblies, and precise differential gear mesh settings. You will also find comprehensive final drive and rear axle specifications, alongside dedicated shim selection charts for accurate backlash control. A major advantage of this publication is the inclusion of highly specific bench data: having the exact mandrel dimensions and shim thickness formulas for setting the bevel drive pinion ensures correct gear mesh and prevents catastrophic drivetrain assembly failures.

Electrical Systems, Fluids, and Safety

Tracing wiring issues or performing system troubleshooting is straightforward with the complete wiring diagrams and detailed starter, alternator, and voltage regulator specifications. The guide also outlines complete fluid capacities for both cooling and lubrication systems. Please note that servicing heavy agricultural equipment involves inherent physical risks, particularly when working with high-pressure hydraulics and heavy lifting equipment. Always review the included factory safety guidelines before beginning any teardown.

Specification Highlights

To demonstrate the technical depth of this publication, the manual lists torque values for cylinder head retaining fasteners at 110–150 N·m (81–111 lbf·ft) across all models. The cold intake valve clearance is clearly specified at 0.15–0.20 mm. You will also find that the combined transmission and hydraulic system capacity for the YM330 is exactly 20 liters. For a broader understanding of what an OEM service publication covers, this document thoroughly details strict hardware tolerances, including piston ring end gaps and crankshaft main journal clearances.