Description

Komatsu HD985 Parts Catalog – What Belongs on Your Bench

I’m Mike Callahan, 28-year ASE Master. I’ve torqued more head bolts than you’ve had hot meals. If you’re wrenching on a Komatsu HD985 and you order the wrong part because you trusted a generic aftermarket list, you’re burning time and money. I’ve seen guys pull a drive shaft, measure it, still get the wrong U-joint because the aftermarket catalog had a typo. That’s stupid. This Parts Catalog – direct from Komatsu – kills that problem. 95 pages of nothing but factory part numbers, exploded views, and the inspection schedules that keep the truck out of the ditch.

Komatsu HD985 Parts Catalog: What’s Inside

This isn’t a service manual. It’s a parts catalog – and it does one thing well: tell you exactly which Komatsu-branded part goes where. The table of contents is in Japanese (Kanji and Katakana), but don’t let that throw you. 概要 (Overview) gives you the model family and serial number break. 安全 (Safety) – read it. It lists the specific lockout and tag-out procedures you need before dropping the body or pulling a hydraulic line. Then the meat: 点検 (Inspection) sections broken into 250-hour, 500-hour, and 1000-hour intervals. Each one cross-references the exact gasket, seal, filter, or cartridge you need. You don’t guess. You order.

5 Inspection Intervals You Need to Know

The catalog dedicates separate chapters to scheduled checks: 250H点検, 250Hﾄﾞﾗｲﾌﾞｼｬﾌﾄ (drive shaft), 500H点検, and 1000H点検. Each chapter lists the wear items and their part numbers. For example, the 250-hour drive shaft inspection calls out the cross bearing and flange bolt part numbers. If you’re doing PM and you don’t have this catalog, you’re either reusing questionable bolts or calling the dealer with a “uh, it’s a HD985” – and that’s a waste of everyone’s phone time.

Safety First – The 安全 Section

Page 1 of the PDF shows the Komatsu parts book disclaimer. But the 安全 chapter is where the real warnings live. It tells you which components require locking pins, what pressure to relieve before removing the steering cylinder, and the correct jacking points. I’ve seen a truck body drop because a guy skipped the lock pin. Don’t be that guy. This section is not optional reading. If you outsource work to a helper, print that page and tape it to the dash.

Inspect the Drive Shaft at 250 Hours

The 250Hﾄﾞﾗｲﾌﾞｼｬﾌﾄ chapter is worth the price alone. It shows the exploded view of the drive shaft assembly, lists the bearing cup part number, and tells you the correct cotter pin size. No generic cross-reference – these are Komatsu p/n’s. If you’ve ever had a drive shaft let go at highway speed, you know why this matters. The safety warning in that section also specifies the torque for the flange bolts – but since this is a parts catalog, not a service manual, you’ll need the workshop manual for actual torque values. For that, grab the Komatsu HD985, HD785 2006 Workshop Manual – OEM Shop Manual.

Where to Find the Right Part Number

Starts on the 構造 (Structure) chapters – one for general structure, one for the air system (構造ｴｱｰ). These are exploded diagrams with callouts. Find the part in the illustration, then read the number from the adjacent table. If you see a Japanese description you don’t understand, the part number is still right there. Cross-check with your machine’s serial number – the catalog covers the HD985 base model. If you have a suffix like -3, look for notes in the Remarks column. For hydraulic steering components, the FAI 67-80DT Hydraulic Steering Piston Parts List covers other makes, but for the Komatsu stick with this catalog. Also, if you need a wider model range, see Komatsu WH609-1 WH613-1 Parts Catalog | 347 Pages OEM.

If you want a fundamental understanding of how these engines work, read this Wikipedia article on diesel engines. For a deeper dive into diesel theory, this Wikipedia article on diesel engines provides context – but for actual parts, this catalog is the only source I trust.

Frequently Asked Questions

Does this catalog include torque specs?

No. This is a parts catalog, not a service manual. For torque specs, get the workshop manual.

How do I tell if a part is superceded?

Komatsu periodically updates part numbers. This catalog lists current numbers as of its print date. If you need supersession history, you’d need the online system. But for most standard replacements, the number in this catalog is correct. Keep in mind that some parts have been redesigned – like the steering cylinder seal kit – and the old number may still be listed for reference. Always verify with your dealer if the machine has had major rebuilds. Also, check the “remarks” column – if there’s a note, it will say “SUPERSEDED BY” or “USE WITH”. I’ve seen guys miss that and order a part that no longer fits. Don’t be that guy.

What years does this cover?

The catalog doesn’t list a specific year range. It covers the HD985 model line as of the publication date. Use your serial number to confirm fitment.

Is this a PDF?

Yes. Immediate access after purchase.

Look, I don’t write product pages for fun. I write them because I’ve been burned by aftermarket parts lists that show the wrong seal diameter or miss a revision entirely. This Komatsu HD985 Parts Catalog is the real thing – OEM, 95 pages, direct from the factory. If you work on these trucks, you need it on your tablet or printed out. Access the Factory Manual – right now – and stop guessing what part goes where.