Yanmar YM135, YM135D, YM155, YM155D, YM195 Service Manual
I’ve been turning wrenches for 28 years. Aftermarket manuals get you into trouble because they cut corners. This is the real deal – the OEM factory Yanmar YM135, YM135D, YM155, YM155D, YM195 Service Manual. 61 pages, direct from the original binder. You get the exact specs that came off the assembly line, not some redrawn interpretation. Page 1 tells you where to find the tractor serial number on the clutch housing and engine data plate locations – details that save you a half-hour of hunting.
Engine Overhaul: Cylinder Head, Camshaft, and Crankshaft
When you’re pulling a cylinder head on a 2T73A or 2TR13A, you need the factory sequence. The Engine section covers remove and reinstall starting at paragraph 42, cylinder head at paragraph 45, valves and seats at 48, tappet adjustment at 47, timing gears at 56, and camshaft at 60. Crankshaft specs? Paragraph 72. Connecting rods, pistons and rings, oil pump – it’s all in there. Page 2 gives you bore and stroke for every engine: the 2T73A has 73 mm bore, 75 mm stroke – 38.26 cubic inches. Don’t trust aftermarket charts. This manual was written in metric and converted to U.S. Customary, so the second number in parentheses is the conversion. Check it against your micrometer.
Cooling, Fuel, and Electrical: Factory Procedures Only
Cooling system starts at paragraph 115 – thermostat, water pump, fan clearance. The diesel fuel system covers filters and bleeding (paragraph 85), nozzle testing (90), Thermostart glow plug (97), and injection timing (86). Electrical gets you alternator and regulator at 120 and starter at 125. If you need the operator’s manual for the YM195 to double-check fluid capacities, grab Yanmar YM195, YM195D, YM240, YM240D Operators Manual – OEM Specs. For the broader Yanmar compact tractor family, see YANMAR YM135/YM155/YM195/YM240/YM330 Service Manual. Another related manual for compact excavators is Ammann Yanmar ViO15-2A, ViO20, ViO25, ViO30, ViO35 2006 Service Manual OEM.
Source Authenticity – OEM vs. Aftermarket PDFs
This is a direct scan of the original Yanmar shop manual. The OCR excerpt you see – “Condensed Service Data” with engine model, bore, stroke, displacement, transmission speeds – that came from the factory print. Aftermarket manuals often transpose numbers or leave out the Thermostart procedure. Here, paragraph 97 is dedicated to it. The index is organized by paragraph number, not page, so you learn where to flip. No guessing about which bolt needs 30 ft-lbs vs. 50 – it’s written in both inch and metric. That’s the difference between a repair that holds and one that leaks.
Real Use Case: Timing Gear Replacement on a YM135
Say you’re replacing timing gears on a YM135. The Engine section at paragraph 56 walks you through gear removal, cam timing marks, and backlash check. You’ll need the flywheel lock and a dial indicator. The manual tells you the gear tooth clearance and the crankshaft key alignment. If you don’t have a background in Manual Transmission fundamentals, the gear ratio tables in the Transmission section (paragraph 150) help you understand what’s happening downstream. For a deeper look at how manual gearboxes work, Manual Transmission articles can fill in the theory.
61 Pages of Real Service Data
Every major system gets covered in those 61 pages. Brakes (210), clutch (130), differential – front and rear (16 and 185), front axle two-wheel and four-wheel drive (1 and 4), front wheel drive (15), governor (101), hydraulic system (240), power take-off (215), steering gear (10), transmission (150). No fluff, no reprints. Each procedure starts with a paragraph number and runs in a straight line. That is what saves you from buying a part you didn’t need.
- Does the manual cover the YM155D model?
- Yes. The index includes columns for YM155D. All systems, same paragraph numbers.
- What about the fuel injection pump calibration data?
- The manual specifies nozzle opening pressure and injection timing for each engine model, but it does not include pump bench calibration curves. For that, you need the engine service data supplement. However, the fuel system section covers on-tractor timing adjustment, filter bleeding, and Thermostart troubleshooting – enough to get a tractor running after a filter change or injector swap. The nozzle section (paragraph 90) gives the pop tester procedure and pressure specifications. If you’re rebuilding the pump itself, you will need a separate injection pump manual.
That is why you need this factory manual on your bench. No wasted time hunting for specs that may or may not be right. Download the Factory Manual and keep it on your tablet or print it out. Your Yanmar will thank you.
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