Description
Yanmar YM135 YM155 Service Manual covering the YM135, YM135D, YM155 and YM155D diesel tractors. This factory workshop publication provides maintenance standards, dismantling and assembly instructions, adjustment data and troubleshooting procedures for professional tractor servicing.
The manual is intended for mechanics carrying out systematic inspection and repair rather than working from estimation or habit. It begins with tractor nomenclature and specifications before progressing through separation, component disassembly, engine overhaul, electrical equipment, transmission, axles, hydraulic lift equipment and final assembly.
Both two-wheel-drive and D-series four-wheel-drive models are included. Where construction differs, the manual identifies model-specific assemblies such as the driven front axle, front differential, front drive components and front PTO arrangements.
ENGINE AND ASSOCIATED SYSTEMS
The engine chapters cover dismantling, construction, maintenance, reassembly and the adjustments required after repair. Subjects identified in the manual include:
- Cylinder liners, pistons, piston rings and piston pins
- Connecting rods, crankshaft and camshaft
- Cylinder head and combustion chambers
- Rocker-arm assembly and valve clearance
- Injection pump, injection valves and injection timing
- Mechanical governor and governor linkage
- Lubricating oil pump, gears, seals and bearings
- Cooling system, fan-belt tension and air bleeding
CLUTCH, TRANSMISSION AND PTO
Powertrain information includes sectional views, lubrication details, maintenance instructions and assembly sequences. Coverage extends to:
- Dry single-plate clutch and related components
- Transmission disassembly and assembly
- Main, counter, driven and connecting shafts
- Low-high range and main gear-change mechanisms
- Reverse, first, second and third-speed selector assemblies
- PTO driving, reduction and output shafts
- Differential lock mechanism
- Final reduction pinion, rear axle shafts and differential
AXLES, STEERING AND BRAKES
The chassis chapters address the principal serviceable assemblies used on the standard and D models. They cover:
- Standard two-wheel-drive front axle assembly
- YM135D and YM155D driven front axle
- Front differential assembly for D models
- Front axle centre-pin arrangements
- Rear axle and final-drive components
- Steering construction and maintenance
- Brake drum assembly and brake system
- Steering and suspension troubleshooting
HYDRAULIC LIFT SYSTEM
The hydraulic section covers construction, maintenance and assembly of the tractor’s rear lift equipment. It includes:
- Transmission lubrication and hydraulic-system layout
- Hydraulic cylinder-head assembly
- Hydraulic piston and piston-rod assembly
- Lifting shaft, lift arms and lift crank
- Control valve assembly
- Hydraulic control fork and operating lever
- Auto-return rod and slow-return valve
- Operational precautions for the lift system
ELECTRICAL EQUIPMENT
An electrical wiring diagram accompanies service information for the charging, starting, lighting and warning circuits. Subjects include:
- Battery inspection and maintenance
- AC generator and current limiter
- Starter-motor dismantling and assembly
- Electrical inspection and characteristic checks
- Optional thermostart equipment
- Optional turn-signal lights
- Water-temperature and oil-pressure indicators
- Horn, lights and safety-start switch
TESTING AND ADJUSTMENT
Adjustment sections provide workshop information for governor linkage, valve clearance, injection timing and fan-belt tension. The tractor chapters also include adjustment procedures, regular inspections, tightening torque ratings and maintenance equipment and tools.
TROUBLESHOOTING AND REPAIR
Fault-finding tables are organised by system to assist diagnosis before components are dismantled. Troubleshooting is provided for:
- Engine and associated equipment
- Electrical system
- Brake and clutch systems
- Transmission and related components
- PTO equipment
- Hydraulic system
- Steering and suspension system
YANMAR YM135 YM155 SERVICE MANUAL MODEL COVERAGE
- Yanmar YM135
- Yanmar YM135D
- Yanmar YM155
- Yanmar YM155D
The D-model information includes the four-wheel-drive front axle, front differential and associated drive components. The manual notes that some specifications may differ according to serial number, but no defined serial-number range is stated in the supplied publication details.
MANUAL DETAILS
- Manufacturer: Yanmar
- Manual type: Factory service/workshop manual
- Machine type: Diesel tractor
- Models: YM135, YM135D, YM155 and YM155D
- Page count: 159 pages
- Language: English
- Publication number: Not stated
This Yanmar YM135 YM155 Service Manual is suitable for agricultural engineers, tractor repair workshops and experienced owners undertaking mechanical servicing or restoration. Its combination of specifications, assembly sequences, adjustments, wiring information and system-based troubleshooting makes it a practical reference throughout diagnosis and repair.
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