Part of the Yanmar Repair Manuals.
Split a Yanmar YM135 at the clutch housing without the factory separation diagram and you find out fast what a guess costs: a second teardown, another gasket set, and a week the hay would not wait for. This service manual (Yanmar publication AOD1048) walks the YM135, YM135D, YM155, and YM155D diesel tractors, with the 2T73A and 2TR13A two-cylinder engines, from tractor separation through engine rebuild, transmission and P.T.O. shaft assembly, hydraulic lift, brakes, steering, and front axle.
It covers machines both before Serial No. 51000 and after Serial No. 51001, and notes where their specs differ, such as the charging system.
All 159 pages download as a PDF that is yours to keep for the life of the tractor: print the torque tables for the bench, keep the wiring diagram in the cab, and get back in the field.
What's Inside This Yanmar YM135(D), YM155(D) Manual
| System | Pages | Key Topics |
|---|---|---|
| Foreward | 2 | - |
| Nomenclature | 5-8 | Muffler, Brake Pedal, Instrument Panel, Steering Wheel, P.T.O. Shaft, Front Axle |
| Specifications | 9-22 | Engine, Electrical System, Clutch, Transmission, Running Gear, Brakes |
| Tractor Separation | 23 | Special Stand, Assembly Stand, Separation Diagram |
| Disassembly Sequence | 24-34 | Installation Stand, Tires, Transmission Case, Fender, Instrument Panel, Front Axle |
| Engine Disassembly | 35-38 | Cylinder Head, Gear Case, Fuel Injection Pump, Piston Assembly, Crankshaft, Camshaft |
| Engine Construction & Maintenance | 39-58 | Cylinder Liners, Pistons, Crankshaft, Camshaft |
| Engine Assembly | 59-64 | - |
| Engine Adjustments | 65-68 | Governor Linkage, Valve Clearance, Fuel Injection Timing, Fan Belt Tension, Air Venting, Other Measurements and Inspections |
| Electrical Equipment | 69-82 | Battery, Governor & Current Limiter, Characteristics, Cautions During Handling and Assembly, Instructions for Disassembly and Assembly, Maintenance and Inspection, Starter Motor |
| Tractor Construction & Maintenance | 83-106 | Clutch and Relevant Items, Transmission and Related Items, Brake, Hydraulic Lift Device, Steering, Front Axle and Rear Axle |
| Tractor Assembly | 107-144 | Transmission Assembly (P.T.O. Driving Shaft Assembly, P.T.O. Fork Shaft Assembly, Front P.T.O. Shaft Assembly, Front P.T.O. Shift Shaft Assembly, Driven Shaft Assembly, Counter Shaft Assembly, Low-High Shift Shaft Assembly, Main Change Shaft Assembly, Fork of the 2nd/3rd Speed Shift Shaft Assembly, Reverse/1st Speed Shift Shaft Assembly, Main Shaft and Transmission Front Cover Assembly, Gear Shaft Lever Assembly, P.T.O. Reduction Shaft Assembly, Connecting Shaft Assembly, P.T.O. Shaft Assembly, Differential Lock Shaft Assembly, Final Reduction Pinion and Rear Axle Shaft Assembly, Differential Device, Disassembly, Cam, Differential Lock Assembly) |
| Tractor Adjustments | 145 | Clutch and Related Items, P.T.O. and Related Items, Brake and Related Items, Hydraulic Equipment, Steering System |
| Troubleshooting | 146-153 | Engine and Related Items, Electrical System, Brake System, Clutch and Related Items, Transmission and Related Items, Hydraulic System |
| Regular Inspection | 154 | Greasing, Replace Engine Lubricating Oil |
| Tightening and Torques | 155-156 | Cylinder Head Nuts, Rod Bolts, Crankshaft Pulley, Clutch Housing, Transmission Case Nuts, Front Axle |
| Maintenance Equipment & Tools | 157-158 | Hydrometer, Micrometer, Cylinder Gauge, Disassembly Stand, Spring Pin Removing Tool, Garage Jack |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Relief valve pressure (safety valve pressure) | 1138 psi (80 kg/cm²) | p. 96 |
| Remedy for faulty relief valve | Adjust setting | p. 152 |
| Current limiter model | RS2130 (KOKUSAN) | p. 71 |
| Generator model | GP8108 (KOKUSAN) | p. 71 |
| Injection timing | 24°±1° before T.D.C. | p. 9 |
| Injection pump type | Yanmar Bosch PFR 2K | p. 9 |
| Steering system type | Ball-screw | p. 98 |
| YM155, YM155D | ||
| Battery model (YM155, YM155D) | Y60-S4LP | p. 69 |
| Steering gear ratio | 18.9:1 | p. 98 |
| YM135, YM135D | ||
| Battery model (YM135, YM135D) | Y60-S4P | p. 69 |
| After Serial No. 51001 | ||
| Current limiter voltage | 14.5V | p. 69 |
| Charging generator capacity | 12V-8.5A | p. 71 |
Yanmar YM135(D), YM155(D) Common Problems This Manual Covers
Engine cranks but will not start
Run the tank dry mid-job or change a fuel filter and air in the lines will keep these diesels from firing no matter how long you crank. The Engine Adjustments section gives the air venting (bleeding) procedure along with fuel injection timing and valve clearance checks.
Manual Section: Engine Adjustments p. 65Battery goes flat, charging quits
These tractors used different charging setups before and after Serial No. 51001, and swapping regulator parts on a guess just kills another battery. The Electrical Equipment section lists the current limiter test values for both serial ranges, plus battery, generator, and starter motor service.
Manual Section: Electrical Equipment p. 69Low power, rough running, smoke
A tired injection pump or worn liners will let the tractor idle fine and then fall on its face under drawbar load. The Engine Construction & Maintenance section covers the injection pump and injection valve along with wear limits for pistons, rings, liners, and crankshaft.
Manual Section: Engine Construction & Maintenance p. 39Three-point hitch weak or leaks down
An implement that sags on the headland turn points to the hydraulic lift device, its safety valve, or internal leakage. The Tractor Construction & Maintenance section covers the lift hardware and gives the 1138 psi (80 kg/cm²) safety valve cracking pressure to test against.
Manual Section: Tractor Construction & Maintenance p. 83Clutch drags or slips under load
A clutch that will not free cleanly makes shifting a fight and wears parts you did not need to buy. The Tractor Adjustments section sets out adjustments for the clutch, P.T.O., brakes, hydraulic equipment, and steering in one place.
Manual Section: Tractor Adjustments p. 145Overheating during heavy fieldwork
Coolant loss or a climbing temperature gauge in the middle of a hot afternoon needs a systematic check, not a parts cannon. The Troubleshooting section works through engine, electrical, brake, clutch, transmission, and hydraulic symptoms with causes and remedies.
Manual Section: Troubleshooting p. 146Frequently Asked Questions
Which tractors does this manual cover?
The Yanmar YM135, YM135D, YM155, and YM155D diesel tractors with the 2T73A and 2TR13A two-cylinder engines. It covers both serial ranges, before Serial No. 51000 and after Serial No. 51001, and notes where specifications differ between them, such as the charging system.
Does it include torque specifications?
Yes. The Tightening and Torques section tabulates the values for reassembly — cylinder head nuts, rod bolts, crankshaft pulley, clutch housing and the rest — so take each figure from that table rather than from memory. p. 155
Can I troubleshoot the charging system with it?
Yes. The Electrical Equipment section covers the battery, current limiter and starter motor. The battery is specified per tractor — Y60-S4LP on the YM155 and YM155D, Y60-S4P on the YM135 and YM135D (page 69) — and the limiter voltage differs by serial range, with 14.5V after Serial No. 51001. p. 69
What pressure should the hydraulic lift on the Yanmar YM135(D), YM155(D) relieve at?
The safety valve cracking pressure is 1138 psi (80 kg/cm²). The Tractor Construction & Maintenance section covers the hydraulic lift device, and the Troubleshooting section gives the remedy for a faulty relief valve. p. 83
How quickly can I access this manual after buying?
Immediate download of the complete 159-page searchable Service Manual. Access it on any device, from a laptop at your desk to a phone in the field.
Are there any print restrictions on this manual?
The PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
Does this Yanmar YM135(D) manual show the machine's wiring?
Complete wiring diagrams are included, covering all electrical circuits, harness routing, and connector pinouts for the Yanmar YM135(D), YM155(D).
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