Description

Yanmar YM241D Parts Catalog

If you’re rebuilding a Yanmar YM241D tractor, you already know the headache of chasing part numbers from aftermarket suppliers. They pull specs from who-knows-where, and half the time the bolt you order doesn’t match the hole. I’ve burned billable hours on parts that looked right but weren’t. This catalog kills that guesswork. It’s the same book the dealer uses. 143 pages of factory drawings, exploded views, and official part listings for the YM241D and its 4WD variant. No reprints, no third-party copy.

Engine Parts Breakdown: ZTR20A-YP Engine Sectional Views

The catalog opens with two full-page Engine Sectional Views (pages iii–iv) for the ZTR20A-YP diesel. These are cross-section drawings that show every component from the cylinder block to the thermostat device. Need a piston ring set? Look at chapter 8 – Piston & Connecting Rod, then flip to the gasket kit chapter (19) to get the correct seal kit. The diagram labels each part with a reference number that ties directly to the parts list. There’s no ambiguity about which oil ring groove or wrist pin fits your engine. I’ve used these drawings to rebuild a seized ZTR20A; the bearing cap orientation is clearly marked, which saved me from a spun main bearing.

Transmission Gears and Housing: Chapters 36–37

The Transmission section covers both 2WD and 4WD models. Chapter 36 lists the gear sets, shafts, and synchro assembly for the YM241 transmission housing. Chapter 37 details the shift levers and linkage. If you’re swapping a worn shift fork, you need the exact part number from this catalog. The drawings show the detent ball locations and spring preload specs. Aftermarket catalogs often combine YM241 and YM241D parts incorrectly, but this book keeps them separate. The Travelling Transmission Sectional Views (pages v–vii) show the complete power flow through the gear train. Page vii covers both models together, so mind the annotations – they mark which parts apply to the 4WD only.

Power Transmission Structural Drawings – Two Models

The first two content pages (i–ii) are full-page structural drawings of the power transmission. One for the YM241 (2WD), one for the YM241D (4WD). These aren’t simplified diagrams; they show every bearing, shaft, and coupling in relation to the tractor frame. When I had a driveline vibration on a YM241D, I used the structural drawing to identify a worn U-joint on the propeller shaft (chapter 26). The drawing labels the front axle parts in their installed positions, which is critical when you’re ordering seals and bearings for the front drive axle. The 4WD model uses a different propeller shaft and ring gear assembly – chapter 27 shows the 1st Shaft & Ring Gear of Front Axle in detail.

Wiring Diagram – Electrical System Guide

Page ix is the full wiring diagram. It covers the electric starting system (chapter 15), starter type S114-14E (chapter 16), and AC generator type LT15/52 (chapter 17). The diagram is a single-page schematic that traces every wire from the battery to the headlights. If you’re troubleshooting a no-crank condition, you can follow the start circuit: ignition switch, safety relay, starter solenoid. The parts catalog lists the exact connectors and harness clips – not generic terminals. I’ve seen guys replace a starter three times because they ordered the wrong nose cone, but the diagram in this book points you to the correct part for the 12V-1.8hp starter. The external link to the Automotive Industry Overview on Wikipedia gives background on diesel tractor electrical systems, but stick with this manual for the actual parts.

Front Axle and Steering for 4WD Models

The chassis section dedicates chapters 23–31 to the front axle and steering. For the YM241D, chapters 24, 26, 27, 28, 29, and 31 cover the 4WD-specific parts: axle bracket, propeller shaft, casing, second shaft/spindle, and steering gear. If you need a front axle casing, chapter 28 gives the exploded view with bolt torque callouts (not in this catalog, but the torque spec is in the service manual). The parts catalog uses imperial thread sizes – you’ll see 0.375-16 UNC bolts on the front axle bracket. Pay attention: the YM241D front axle uses different tie rod ends than the 2WD model. Ordering the wrong steering arm wastes a week. The following related manuals are also available: YANMAR YM241D Parts Catalog Pub. No. K060E1293, Ammann Yanmar B12 B17 Parts Catalog, and Yanmar YB271, B27 1994 Parts Catalog – OEM Factory Specs.

FAQs

Can I use this catalog to cross-reference aftermarket parts with OEM numbers?

Yes. Each part has an OEM reference number. The exploded views list the number next to the diagram callout. You can match that to aftermarket cross-reference guides, but I recommend using the OEM number directly for ordering from dealers.

Does it include torque specifications?

No. This is a parts catalog, not a service manual. Torque values are listed in the separate Yanmar YM241D service manual.

This catalog doesn’t waste space with generic illustrations. It’s the same document that Yanmar shipped to dealers in the 80s and 90s. If you’re tearing down a YM241D engine or rebuilding its transmission, you need part numbers from the original source. Don’t trust photocopied aftermarket lists that combine model years. Access the Factory Manual and keep it on your tablet or print the pages you need. Your parts counter will thank you, and your tractor will run on the right bearings.