Description

Komatsu D155AX-6 Service Manual – Factory Specs for Your Bulldozer

You’ve got a D155AX-6 in the shop, the owner’s breathing down your neck, and you’re staring at a control valve that’s acting up. You reach for the aftermarket reprint that claims ‘covers all models’. That’s when you waste an hour chasing a spec that doesn’t match your serial number. This is the OEM Komatsu D155AX-6 Service Manual – 312 pages of factory procedures, not a photocopy of a photocopy. Page 1 carries the warning that unsafe operation can cause serious injury or death. That’s the kind of weight this document carries.

Komatsu D155AX-6 Service Manual: What This 312-Page Document Covers

This manual is split into Foreword, Safety, Operation, Maintenance, Specifications, and Attachments/Options. The Foreword lays out the machine’s PIN location, engine number plate, and ROPS/FOPS plate positions – things you need for parts ordering and compliance. The Safety chapter isn’t a checkbox exercise; it includes noise emission levels and vibration reduction guides. If you’re working on a job site with OSHA ears, that data matters.

Safety Information: Vibration Levels and Noise Emission Data

Most aftermarket reprints skip the safety data because it doesn’t sell copies. Not this one. The manual dedicates a full section to vibration levels and a guide to reduce vibration on the machine. It also covers EPA regulations and the engine number plate location. If you’re rebuilding a D155AX-6 for resale or rental, you need those compliance details. Aftermarket manuals won’t give them to you.

Engine Start and Warm-Up: Factory Procedure

The Operation chapter walks through normal starting and cold-weather starting – something a lot of DIY guys bone. It includes the warm-up procedure for cold areas and the specific checks after starting. The Machine Monitor section explains basic check monitors, caution monitors, and emergency monitors. If an idiot light comes on, you need to know whether it’s a warning or a stop-machine-now. This manual tells you the difference by serial number range.

Operation and Maintenance Chapters – Real Field Use

You get the full breakdown of blade adjustment, tilt adjustment, ripper operation, and even the method of angling the blade. The ripper section covers digging boulders, operating on slopes, and using the pin puller – stuff that breaks if you guess. The Maintenance chapter (not shown in the excerpt but listed in the TOC) will include fluid capacities, filter part numbers, and lubrication intervals. Pair this manual with the Komatsu D155AX-8, D155AX-6 Workshop Manual – 1146 Pages for deeper powertrain work.

OEM Document vs. Aftermarket Reprints – Why It Matters

I’ve seen techs snap bolts because they used a torque spec from a reprint that was scanned at 72 dpi and missing a decimal point. This manual came from Komatsu’s own distribution. It’s the original PDF, not a copy of a copy. The page counts match, the diagrams are legible, and the serial number breakpoints are correct. If you need to verify a wiring diagram for the machine monitor or the fuse box circuit breaker, this is the only source you should trust. For a more detailed workshop-level look, check the Komatsu D155AX-6 Workshop Manual – 1568 Page Factory Bulldozer Guide. That one covers full disassembly and rebuild.

Does this manual cover the engine specifically?

Yes. The Engine number plate location is included, and the Operation chapter covers starting, warm-up, and cold-weather operation. For internal rebuild specs, you want the Workshop Manual – that’s a separate product with 1568 pages.

Will this manual help me diagnose a no-start condition?

The Operation chapter walks through the pre-start checklist, machine monitor, and fuse box – including fuse capacity and circuit breaker location. That’s your first diagnostic step. If the monitor shows an emergency indicator, the manual tells you what it means. Aftermarket reprints skip those monitor tables. This one includes all of them. You also get the circuit breaker for main power supply and the Basic Check Monitors. That’s a solid starting point before you break out a multimeter.

Every time I see a tech working on a D155AX-6 without the factory manual, I know they’re spending extra time guessing. Don’t be that guy. Access the factory manual and keep it in your bay. It’s 312 pages of Komatsu’s actual instructions – not someone’s best guess. Access the Factory Manual now and get the right data before you turn a wrench. For related heavy equipment, see the Demag Komatsu H 285 S Service Manual – 544 Pages of Factory Specs.

• Manual Transmission
• Manual Transmission