Description
Yanmar YM135(D) YM155(D) Service Manual is the factory workshop publication for the Yanmar YM135, YM135D, YM155 and YM155D diesel tractors. It provides maintenance standards, dismantling and assembly instructions, adjustment data and troubleshooting procedures intended to help repair technicians carry out accurate, systematic servicing.
This 159-page manual covers both two-wheel-drive and four-wheel-drive models, including the model-specific front axle and front drive equipment fitted to the YM135D and YM155D. It is suitable for agricultural engineers, professional workshops and experienced owners undertaking mechanical repairs, inspections or major component work.
The publication begins with tractor nomenclature, specifications, power-train information, sectional views and system diagrams. It then follows the principal workshop sequence from tractor separation and component disassembly through engine overhaul, transmission assembly, hydraulic work, adjustment and fault diagnosis.
ENGINE AND ASSOCIATED SYSTEMS
The engine chapters provide construction, maintenance, dismantling, assembly and adjustment information for the two-cylinder Yanmar diesel engines fitted across the covered models. Confirmed subjects include:
- Cylinder liners, pistons, piston rings and piston pins
- Connecting rods, crankshaft and camshaft
- Cylinder head, combustion chambers and rocker-arm assembly
- Injection pump and injection valves
- Mechanical governor and governor linkage
- Lubricating oil pump and engine lubrication system
- Cooling-system components and fan-belt adjustment
- Gears, oil seals, O-rings and ball bearings
ENGINE TESTING AND ADJUSTMENT
Dedicated adjustment information supports correct engine setting following inspection or overhaul. The manual covers:
- Governor-linkage adjustment
- Valve-clearance setting
- Fuel-injection timing
- Fan-belt tension
- Fuel-system air venting and bleeding
- Engine measurements and inspections
CLUTCH, TRANSMISSION AND PTO
Power-train coverage includes sectional information, disassembly sequences, maintenance instructions and assembly procedures. Workshop subjects identified in the contents include:
- Dry single-plate clutch and associated components
- Transmission construction and related items
- Main, driven, counter and connecting shaft assemblies
- Low-high and main-change selector mechanisms
- Reverse and first-speed shift mechanism
- PTO drive, reduction and output shaft assemblies
- Front PTO components for YM135D and YM155D tractors
- Differential lock, differential and final-reduction assemblies
AXLES, STEERING AND BRAKES
The manual distinguishes between the front axle arrangements used on standard YM135 and YM155 tractors and those fitted to the YM135D and YM155D four-wheel-drive versions. Coverage includes:
- Standard front axle assembly
- Four-wheel-drive front axle assembly
- Front differential assembly for YM135D and YM155D
- Front axle centre-pin arrangements
- Rear axle and final-reduction components
- Steering construction and maintenance
- Brake and brake-drum assemblies
- Differential-lock components
HYDRAULIC LIFT SYSTEM
Hydraulic-system chapters cover the tractor lift mechanism and its principal control assemblies. Subjects include:
- Transmission lubrication and hydraulic-system arrangement
- Hydraulic lift construction and maintenance
- Cylinder-head and hydraulic piston-rod assemblies
- Lifting shaft, lift arms and lift crank
- Hydraulic control valve
- Control fork and hydraulic control lever
- Auto-return rod and seat-bracket assembly
- Slow-return valve and operating precautions
ELECTRICAL EQUIPMENT
Electrical coverage includes a wiring diagram together with inspection, maintenance, handling and assembly information for the tractor electrical equipment. Confirmed topics include:
- Battery maintenance
- AC generator, regulator and current limiter
- Starter motor disassembly, assembly and inspection
- Optional thermostart equipment
- Optional turn-signal lights
- Water-temperature and engine-oil-pressure indicators
- Horn, lighting and safety-start switch
TROUBLESHOOTING AND REPAIR
A dedicated troubleshooting chapter provides fault-finding guidance organised by tractor system. It addresses engine-related faults, electrical equipment, brakes, clutch, transmission, PTO, hydraulics, steering and suspension. Additional workshop references include regular inspections, tightening torque ratings, maintenance equipment and tools.
YANMAR YM135(D) YM155(D) SERVICE MANUAL MODEL COVERAGE
- Yanmar YM135
- Yanmar YM135D
- Yanmar YM155
- Yanmar YM155D
The “D” models are covered with their applicable four-wheel-drive front axle, front differential and front drive arrangements.
MANUAL DETAILS
- Manufacturer: Yanmar
- Machine type: Diesel tractor
- Manual type: Factory service/workshop manual
- Page count: 159
- Language: English
- Publication number: Not stated in the supplied evidence
The Yanmar YM135(D) YM155(D) Service Manual is a practical technical reference for work extending beyond routine operator maintenance. Its combination of specifications, dismantling sequences, assembly instructions, adjustment procedures and system-based troubleshooting makes it suitable for workshop repair and restoration work.
Model distinctions shown within the manual should be observed carefully, particularly when working on front axle and drive components. Serial numbers should also be checked against the tractor before ordering parts or applying specifications where the manual notes serial-dependent differences.
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