Description

Yanmar YM135, YM135D, YM155, YM155D, YM195 Service Manual

I’ve seen tractors come into the shop with snapped bolts from guessing torque specs. That’s what happens when you rely on a generic aftermarket CD instead of the real factory documentation. This 61-page OEM Yanmar YM135, YM135D, YM155, YM155D, YM195 Service Manual is the actual shop manual dealers used. It covers the 2T73A, 2TR13A, and 2T84A engines across these five models. If you’re pulling a cylinder head, adjusting valves, or bleeding the fuel system, you need the specs from this book – not a third-party summary that leaves out the fine print.

Engine Overhaul: Camshaft, Crankshaft, and Cylinder Head Data

Paragraphs 42 through 78 in the Engine section lay out the complete tear-down and rebuild procedures. The camshaft section (paragraph 60) gives lobe lift and journal clearance specs. Crankshaft (paragraph 72) covers main journal and crankpin dimensions, end play, and thrust washer thickness. Cylinder head tightening sequence and torque values are on page 45 – do not skip that page. The manual prints both metric and imperial measurements; use the primary spec, not the conversion in parentheses, unless you’ve verified the conversion factor yourself. Too many guys grab the inch-pound number and wonder why the gasket leaks.

Fuel System: Filter Bleeding, Nozzle Testing, and Thermostart Timing

Start paragraphs 85-97. For the YM135 and YM155, injection timing is paragraph 86. For the YM195 it’s paragraph 88. The nozzle test pressures are listed. The thermostart heater (paragraph 97) is often overlooked in cold-start troubleshooting. Bleeding the filters is covered stepwise – no shortcuts. If you’ve ever chased a no-start on a Yanmar diesel because the previous owner bypassed the bleed screw, you’ll appreciate having the exact procedure in front of you.

Does the Cooling System Get Proper Coverage?

Paragraph 115 covers the full Cooling circuit: water pump removal, thermostat testing, and coolant capacity. The spec gives the correct antifreeze mixture in quarts for each model. One thing I notice about aftermarket manuals – they’ll say “drain system” but skip the torque for the water pump bolts. This OEM manual does not skip that. It gives you the data to keep the 2T series engine from overheating in a Texas summer.

3 Systems You Cannot Afford to Skip

Brakes (paragraph 210), Hydraulic System (paragraph 240), and Power Take Off (paragraph 215). The brake section includes adjustment specs for the band brakes and a warning about hydraulic fluid contamination. The hydraulic system section lists relief valve pressure settings for the lift circuit. The PTO section covers clutch pack clearance. If you’ve ever had a PTO that won’t disengage, you know this data is worth more than the price of the manual.

Electrical: Starter and Alternator Diagnostics

Paragraphs 120-125. The starter removal is straightforward, but the alternator regulator test procedure is what saves you from swapping a good part. The manual gives the output voltage ranges and field coil resistance for the alternator & regulator (paragraph 120) and the starter solenoid continuity check. The electrical system section is short – only a few pages – but it covers the common failure points. Use it before you buy a new alternator.

This manual is written for the owner who wants to maintain his own tractor and for the shop that sees a YM155D come in and needs the right governor adjustment (paragraph 101). The index at the front gives you the exact paragraph number for each model variant – YM135, YM135D, YM155, YM155D, YM195 are all listed in separate columns. You don’t have to guess which spec applies to your tractor serial number.

I’ve been bitten by aftermarket manuals that skip half the table of contents or print a generic wiring diagram that doesn’t match the YM155D’s harness. This is an original OEM scan – 61 pages, matching the “SHOP MANUAL” header on page one. The data comes from the same source that trained factory technicians. Page 2 gives the condensed service data: bore, stroke, displacement, firing order – all of it. That kind of authenticity matters when you’re ordering pistons and rings.

Does this manual cover the YM240 and YM330?

It includes data for those models, but the primary focus is YM135 through YM195.

What torque specs are provided?

For the cylinder head, the manual lists the tightening sequence and torque in both metric and imperial. Connecting rod bolts, main bearing cap bolts, flywheel bolts – all are specified in the Engine section. Crankshaft end play and piston ring gap dimensions are also given. This is not a generic range; it’s model-specific per the 2T73A, 2TR13A, and 2T84A engines used.

Is the wiring diagram included?

The Electrical section includes schematics for the alternator and starter circuits. Not a full chassis wiring harness diagram, but enough for troubleshooting charging and cranking issues.

Can I use this for a YM195D?

Yes, the YM195D is listed in the index and condensed service data page alongside the YM195.

If you’re about to tear into one of these Yanmars, get the factory data before you start. This is the shop manual that keeps you from guessing. Related manuals include the Yanmar YM135 YM155 YM195 YM240 YM330 Shop Manual for the wider lineup, the Yanmar YM195, YM195D, YM240, YM240D Operators Manual – OEM Specs for operator instructions, and the Ammann Yanmar ViO15-2A, ViO20, ViO25, ViO30, ViO35 2006 Service Manual OEM for compact excavator applications. For background on Manual Transmission theory, that’s a separate topic, but the transmission section in this manual (paragraph 150) covers disassembly and shim selection for the YM135. Another place you’ll need external reference is the Manual Transmission basics – the manual gives the procedure for synchro inspection and gear backlash. Access the Factory Manual.