Description

Komatsu W170-2 Workshop Manual – What You Get for 526 Pages

I’ve torqued head bolts on everything from a lawnmower to a D8. When I see a Komatsu W170-2 Workshop Manual that’s 526 pages of factory print, I know someone took the time to document every damn spec before the machine left Japan. If you’re cracking open a W170-2, you need this book on your bench, not some aftermarket translation that guesses at clearances. This is the OEM document, revision marks and all, straight from the original PDF.

Engine Disassembly: Page 13-1 Through 13-8

Section 13 of the ENGINE chapter walks you through disassembly and assembly. Eight pages of procedure, but that’s just the start. You get the full STRUCTURE AND FUNCTION breakdown earlier in the chapter. The manual doesn’t assume you know the order of bolts on the head. It gives you the sequence because the guy who wrote it has seen a warped deck. Need the charge pressure? Not in this section—that’s in POWER TRAIN testing. But for pulling the engine, start at 13-1. The tool list isn’t hidden. They tell you what wrenches, what pullers, and what torque wrench range.

Torque Specs: Why OEM Data Is Non-Negotiable

Aftermarket manuals love to give you a single torque value for a bolt that actually has a two-stage tightening procedure. The W170-2 Workshop Manual lists final torque values with tightening angles where needed. I’ve seen guys strip threads because they used a generic spec from a third-party DVD. This manual gives the factory numbers from Komatsu’s own test stands. Page 22-1 for testing and adjusting on the power train. Page 23-1 for disassembly—the exact pages are marked with revision bullets. If you follow those numbers, you’re not guessing.

7 Systems Covered in 526 Pages

Here’s what the table of contents breaks down: GENERAL (just a few pages), ENGINE (13-, 14-?), POWER TRAIN (21 through 24), STEERING SYSTEM (41 through 44), AIR SYSTEM (51 through 54), HYDRAULIC SYSTEM (61 through 64), WORK EQUIPMENT (71 through 74), and OTHERS (91 – ELECTRICAL SYSTEM). That’s every major system on the machine. Each system has its own STRUCTURE AND FUNCTION, TESTING AND ADJUSTING, DISASSEMBLY AND ASSEMBLY, and MAINTENANCE STANDARD sections. You want to understand how the steering valves work? Section 41. You need the adjustment specs for the air brake? Section 52. This is not a highlight reel—it’s the full playbook.

Hydraulic System Testing: What the Manual Covers (Sections 61–64)

The hydraulic system runs the work equipment and steering. Section 62 covers TESTING AND ADJUSTING. That’s where you find pressures, flow rates, and how to set relief valves. I’ve had guys call me saying their blade drifts down. They didn’t have the test port locations. This manual gives you port numbers and the pressure values in imperial units—psi. No converting from bar if you don’t want to. The MAINTENANCE STANDARD in section 64 tells you acceptable wear limits for pump components. That’s what keeps a rebuild from turning into a swap-a-thon. If you’re doing hydraulics, start at 61-1 and read through 64.

Air System: Structure and Function Breakdown

Section 51 through 54 covers the air system—brakes, clutch controls, maybe the horn. The manual spells out the function of each valve and the testing procedure. Page numbers are consistent with the printed Japan edition (SEBM0384C01). You get a list of revised pages at the front so you know exactly which pages were updated. That matters when you’re ordering parts. The maintenance standard in section 54 gives you the allowable leak rates. Those are specs you can’t find in a Chilton’s because Chilton never touched a Komatsu.

Why This Manual Beats Aftermarket Copies

Third-party reprints often miss revision pages. Look at the LIST OF REVISED PAGES in the PDF—pages like 23-41, 23-83, 63-23 have revision marks. An aftermarket copy will either skip those or blur the marks. This is the exact scan from Komatsu. It’s not a translation; it’s the Japanese factory manual written in English for export. Every torque, every clearance, every electrical schematic in section 91 is as-built. If you’re serious about keeping the W170-2 running, you don’t buy a manual that says “typical values.” You buy this one.

FAQ

Does this manual cover the full engine rebuild?

Yes, section 13 covers disassembly and assembly, and the MAINTENANCE STANDARD gives wear limits.

I see page numbers with revision bullets in the list—does that mean the PDF is missing pages?

Not at all. Those bullets mark pages that were updated in a later revision. The manual includes the latest revision printing. The first two pages show the revision table with marks like ⚫ on page 00-1, 23-1, etc. That’s how Komatsu tracks changes. You get the current version, not a mix of old and new. The manual has 526 pages total, every one scanned from the original binder. If a page was replaced, the original is discarded—the PDF only contains the active pages. So you’re working with the same information the dealer’s techs use. That’s why I won’t touch a W170-2 without this PDF open on my tablet.

You need the wiring diagram for the instrument cluster? Section 91 gives you the full electrical system. You need the steering torque specs? Section 42. This isn’t a guide that skips steps—it’s the factory workflow. Access the Factory Manual now and keep it on your tool box. I’ve been turning wrenches for 28 years, and I can tell you that the difference between a flat rate job and a comeback is having the right spec. This book has every spec you need.

Related Manuals:

• Komatsu WA65-5 WA70-5 WA80-5 2005 Workshop Manual
• Komatsu WH609-1E0 WH613-1E0 WH713-1E0 WH714H-1E0 WH716-1E0 Workshop Manual
• Komatsu PW95R-2 Workshop Manual – 520 Pages of Factory Specs

External resources: Manual Transmission basics and Manual Transmission theory (for reference on similar drivetrain components).