Description

Komatsu PC100, PC120, PC150, D20, WA100 Parts Catalog

I’m Mike Callahan. After 28 years turning wrenches in San Antonio, I can tell you the fastest way to lose money is ordering the wrong part. That’s why this Komatsu PC100, PC120, PC150, D20, WA100 Parts Catalog sits on my bench. It’s the factory list, not some aftermarket reprint that swaps part numbers without telling you. If you’re rebuilding a 4D95 or S4D95 engine and you need to know which piston kit fits your serial number, this is where you start.

What’s Inside This 58-Page Parts Catalog?

The first page (page 1) lists every application and serial number range for the Komatsu 95 Series. You get excavators like the PC100-3, PC120-5, PC150-5, PC60-3 up through PC220, dozers like the D20P-6 and D21A-6, graders such as the GD305-A-1A, and wheel loaders including the WA100 and WA150-1. Each model has a starting serial number—so you can cross-check your machine before you order anything. The next section (page 2) dives into cylinder kits and components. This is where the real work begins.

Cylinder Kits and Engine Overhaul Options

Page 2 breaks down the Komatsu 4D95 Engine and Komatsu S4D95 Engine. You get piston/liner sets, piston pins, ring sets, liners, and complete cylinder kits with OEM part numbers like 6204-31-2121 (KMP6204) and 6202-32-2140 (KMP6202). For each engine version, there are three kit levels: Engine Overhaul Kit (EOK), Out-of-Frame Kit (OFK), and In-Frame Kit (IFK). That means you can pull exactly the parts you need without buying a box of stuff that doesn’t apply to your job. I’ve had too many apprentices order a generic “engine kit” and end up with the wrong piston height—this catalog kills that mistake.

Komatsu 95 Series Applications: PC100, PC120, PC150, D20, WA100

The application list on page 1 covers all the machines that use the 95-series engine. For excavators: PC100-3 (serial 18001-up), PC100-5/5C (28001-up), PC100-6/6Z (40001-up), PC120-3 (18001-up), PC120-5 (30001-up), PC150-3/LC-3 (3001-up), and so on. Dozers include D20P-6 (60001-up), D20P-7A (75001-78603), D21A-6 (60001-up). Wheel loaders like WA100/WA100-3 (10001-up) are listed. If you’re working on any of these, this catalog gives you the exact serial number break. No guessing, no calling the dealer for a VIN you don’t have.

Does This Manual Cover the D20 Dozer and WA100 Loader?

Yes. The D20 appears under dozers with multiple variants: D20P-6, D20P-7A, D20PL-6, D20Q-6, D20S-6. Each has its own serial range. The WA100 shows up under wheel loaders as WA100/WA100-3 with serial 10001-up. The catalog also lists WA120-1, WA150-1/1A, and others. If your machine uses the 95-series engine, it’s in here. Don’t trust a third-party website that lists “fits all” – use this and confirm your parts by serial.

Get the Right Part Number the First Time

When you’re ordering a cylinder kit for a Komatsu 4D95 engine, you need the OEM number. Page 2 shows kit contents with quantities and cross-references. For example, the KMP2141.EOK-4 overhaul kit lists 4 cylinder kits included. The S4D95 engine section has its own piston numbers like 6206-33-2140 and 6207-31-2121. Compare these with what’s in your engine and you’ll know exactly which bag to grab. I keep a copy of this catalog in the shop because it’s faster than digging through the dealer’s system and it’s right every time. For more on how diesel engines are built, read this Wikipedia article on diesel engines. Also, this Wikipedia article on diesel engines explains the combustion cycle if you need theory.

If you’re working on a PC100 or PC120, you might also want the full service manual – check out Komatsu PC100, PC120-3 Service Manual – OEM Factory Shop Book for procedures. For hydraulic steering parts, FAI Komatsu 67-80DT Parts Catalog – OEM Hydraulic Steering Piston List covers those. And if you run into a WH609 or WH613, Komatsu WH609-1 WH613-1 Parts Catalog | 347 Pages OEM is a solid reference.

FAQ

What models does this 58-page catalog cover?

PC100, PC120, PC150, PC60, PC70, PC78, PC80, PC90 excavators, D20 dozer, GD305 and GD510/511 graders, WA100, WA120, WA150, WA180, WA250, WA40, WA70 wheel loaders – all with Komatsu 95-series engines.

Does this catalog include torque specs?

No. It’s a parts catalog, not a service manual. Torque values require the factory shop book.

Are the part numbers in this catalog original Komatsu numbers or aftermarket replacements?

They are KMP brand numbers that cross-reference to Komatsu OEM. The catalog states on page 1 that all original equipment manufacturers’ names are for reference only, but the numbers shown are the ones you order. I’ve used KMP on dozens of rebuilds – quality is good and the fitment is correct when you match your serial.

How do I know which cylinder kit to order?

Find your engine (4D95 or S4D95) on page 2, match the piston part number to your existing parts, then pick the overhaul kit level: EOK (full overhaul), OFK (out-of-frame), or IFK (in-frame). The catalog lists kit contents with quantities. If your engine serial falls within the ranges on page 1, you’re good.

Don’t waste time chasing parts that don’t fit. Access the factory manual, match your serial, and order with confidence. Access the Factory Manual now and keep it on your tablet or bench.