Yanmar YM135, YM135D, YM155, YM155D, YM195, YM195D, YM240, YM240D, YM330 and YM330D tractor shop manual, 1977-1981 edition

Yanmar YM-Series Tractor Shop Manual: Models YM135 to YM330D

Keep your Yanmar tractor running at peak performance with this comprehensive professional-grade shop manual. Covering the iconic YM series from 1977-1981, this manual provides the deep technical insights required for everything from routine maintenance to full engine and transmission overhauls. Whether you own the compact YM135 or the powerful three-cylinder YM330D, this guide is your definitive resource for precise repairs and specifications.

Full Model Coverage & Technical Identification

This manual is specifically engineered for the following Yanmar tractor combinations:

• YM135 & YM135D (2-Cylinder, 2TR13A Engine)
• YM155 & YM155D (2-Cylinder, 2T73A Engine)
• YM195 & YM195D (2-Cylinder, 2T84A Engine)
• YM240 & YM240D (2-Cylinder, ZTR20A-X Engine)
• YM330 & YM330D (3-Cylinder, 3T84A / 3T84ALP Engine)

Pro Tip for Owners: To ensure you are using the correct data, locate your Tractor Serial Number stamped on the left side of the clutch housing. For engine-specific parts, the Engine Model and Serial Number are found on a data plate on the right side (YM135-YM155D) or the left side (YM195-YM330D) of the engine block.

Comprehensive Engine & Performance Service

Master the heart of your tractor with detailed sections on the Yanmar diesel powerplants. This manual covers:

• Cylinder Head & Valves: Complete torque sequences and cold tappet gap settings (0.2mm for YM135/155; 0.15mm for larger models).
• Fuel Injection System: Step-by-step instructions for the Yanmar PFR2K and PFR3K injection pumps, nozzle testing, and the essential Thermostart system for cold-weather operation.
• Governor Adjustments: Precise procedures to set high and low idle speeds, ensuring your engine responds correctly under load.

Drivetrain, Transmission & 4WD Systems

From the single and dual clutch systems to the complex 4WD front axles, get the "Amazon-style" clarity you need for heavy-duty repairs:

• Transmission Overhaul: Full coverage of gear shifting forks, range levers, and differential lock mechanisms. Includes specific gear tooth counts for model-specific identification (e.g., the 27-tooth gear found in YM330D units).
• Front Axle Service: Detailed Exploded views of both 2WD and 4WD configurations. Learn how to correctly adjust toe-in (4-8mm) and maintain steering spindle clearances to prevent premature wear.
• Hydraulic System & 3-Point Hitch: Troubleshooting for the rockshaft and control valves, including relief valve pressure settings (ranging from 1138 psi on smaller units up to 2550 psi on the YM330 series).

Essential Maintenance Data

• Capacities: Know exactly how much you need—from the 3.2-quart cooling system of the YM135 to the 21-quart hydraulic/transmission sump of the YM330D.
• Electrical Wiring: Full-page wiring diagrams for all models to trace charging and starting circuits effortlessly.
• Standard & Metric Specs: All measurements are provided in both Metric (SI) and U.S. Customary systems for your convenience.

This manual is more than just a repair guide; it is an investment in the longevity of your Yanmar tractor. Save time and avoid costly mistakes by having the exact factory-spec clearances and torque values at your side during every project.