Pulling your diesel tractor apart is a lot less stressful when you have this 159-page Yanmar ym135(d), ym155(d) service manual pdf on the workbench. Inside, you get full electrical wiring diagrams, step-by-step transmission teardown procedures, and hydraulic schematics detailing the lift device control valve. Open up the dedicated troubleshooting section to diagnose fuel injection timing faults and governor linkage issues before you start buying parts. Verify the hydraulic relief valve pressure is set to exactly 1138 psi (80 kg/cm²) and confirm you are installing the correct Y60-S4LP battery for the 155 series. Stop wasting shop hours guessing at tolerances. Grab this bookmarked digital download, load it onto your phone or tablet, and get your machine running right.
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, Check Battery Electrolyte Specific Gravity, Clean Air Cleaner Element, Replace Engine Lubricating Oil, Check (Replace) Transmission 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 | Y60-S4LP | p. 69 |
| Steering gear ratio | 18.9:1 | p. 98 |
| YM135, YM135D | ||
| Battery model | 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
Yanmar YM135 and YM155 engine cranks but will not start or starts only after extensive bleeding p. 147
Inspect fuel injection timing according to the procedures on page 9. Set the injection timing to exactly 24°±1° before T.D.C. If the issue persists, test the injection pressure and verify it meets the standard 2.276 psi (160 kg/cm²). Replace injectors if pressure drops below 1707 psi (120 kg/cm²) on page 53.
Manual Section: Engine and related itemsCharging failure, dead battery, or intermittent electrical operation from faulty regulator or alternator wiring p. 149
Test the charging circuit and examine the current limiter. Replace the current limiter as a unit as directed on page 75. For models after Serial No. 51001, verify the charging generator capacity operates at 12V-8.5A as specified on page 71. Check battery electrolyte specific gravity during regular inspection on page 154.
Manual Section: Electrical systemHeavy steering, excessive steering wheel play, front tire shimmy, or uneven tire wear p. 153
Measure the steering wheel play and adjust it to 1.17-2.0 in (30-50 mm) as shown on page 98. Adjust the toe-in until the difference is 0.157 - 0.315 in. (4-8 mm) on page 101. Torque the front axle bracket bolts to 58-72 ft-lbs (8.0-10.0 kg-m) using specifications on page 155.
Manual Section: Steering and suspension systemsImplement drops, free descent rate is too fast, or strange noises come from the hydraulic pump p. 152
Adjust the hydraulic cylinder safety valve cracking pressure to exactly 1138 psi (80 kg/cm²) as detailed on page 96. Test the implement lifting operation. If the remedy for a faulty relief valve requires further action, adjust the setting per the troubleshooting guide on page 152.
Manual Section: Hydraulic systemFrequently Asked Questions
How do I adjust the hydraulic pressure relief valve on a Yanmar YM135D/YM155D?
The manual indicates that the hydraulic pressure relief valve can be adjusted if there is an improper pressure setting. The specified relief valve pressure (safety valve pressure) is 1138 psi (80 kg/cm²). While the manual confirms adjustability as a remedy, it does not provide a step-by-step procedure for performing this adjustment.
What are the torque specifications for the cylinder head nuts on a Yanmar YM135D/YM155D?
The tightening torque for the cylinder head nuts is specified as 114-116 ft-lbs (15.5-16.0 kg-m). This information is found in the 'Tightening Torque Ratings' section of the manual.
How do I adjust the clutch on a Yanmar YM135D/YM155D?
Clutch adjustment involves adjusting the clutch pedal stroke and play. The standard dimension for clutch pedal play is 1.18-1.57 inches (30-40 mm). This adjustment should be performed after the total stroke of the clutch pedal and the clutch pedal play have been properly adjusted.
How do I bleed the fuel system on a Yanmar YM135D/YM155D?
To bleed the fuel system, first put fuel into the fuel tank. Then, loosen the air venting plug (A) of the fuel filter, allow fuel to flow until free of air bubbles, and tighten. Repeat this process with the air venting plug (B) and the air venting plug of the fuel pump. Finally, loosen the injection valve side of the fuel injection pipes and tighten them once fuel starts reaching the No. 1 and No. 2 cylinders.
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.
Are there wiring harness diagrams in this Yanmar YM135(D), YM155(D) manual?
Complete wiring diagrams are included, covering all electrical circuits, harness routing, and connector pinouts for the Yanmar YM135(D), YM155(D).
Document Quality
This document is a scanned PDF with an OCR layer, allowing you to search and copy the full text. The text quality is generally clear and readable, though some pages show minor blurriness from the original scan. Diagrams and illustrations are scanned images, which are mostly legible for labels but will pixelate if zoomed extensively. Pages are largely clean, with occasional faint scan artifacts or slight skewing typical of a scanned manual.
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