Description

Komatsu D155A-6 Workshop Manual

I’ve seen too many guys tear into a D155A-6 transmission with a generic aftermarket guide and end up with a pile of parts they can’t reassemble. That’s not how you make money. You need the factory Komatsu D155A-6 Workshop Manual – 1331 pages of the exact specs Komatsu used to build this machine. The serial number range is 85001 and up, so you know it’s matched to your dozer. No guesswork, no reprints, no third-party shortcuts.

What’s Inside the 1331 Pages

This manual covers everything from the engine and cooling system to the undercarriage and electrical system. The table of contents lists sections like “Engine and cooling system”, “Power train, Part 1”, “Hydraulic system”, “Work equipment”, “Cab and its attachments”, and “Electrical system”. Each section has structure, function, maintenance standards, testing and adjusting procedures, and disassembly/assembly. You get the standard tightening torque table, conversion table, and all the special tool sketches. The index is broken down by Form Number, so you can find the exact page you need without flipping through 1331 pages blind.

Hydraulic System: Factory Diagrams and Procedures

The hydraulic system section includes work equipment hydraulic piping diagrams, control valve breakdown, PPC valve, accumulator, quick drop valve. If you’ve ever had a blade that drifts or a ripper that won’t hold, you’ll find the test procedures in the “Testing and adjusting” section. That section alone is divided into four parts, covering engine, power train, and work equipment oil pressure measurements. The manual even shows you how to bleed air from the fan pump and work equipment pump – steps that most aftermarket manuals skip entirely.

Electrical System: Wiring and Troubleshooting

The electrical system section covers engine control, monitor system, sensors, palm command control, and KOMTRAX. The troubleshooting section is massive – failure code tables, E-mode, H-mode, S-mode troubleshooting. You get the exact procedures to diagnose electrical problems without guessing. The manual explains how to read electric wire codes and handle connectors used for engines. If you’re chasing a no-start or a monitor fault, this is the only source you should trust.

Who Needs This Manual?

If you’re a shop owner or a technician who works on heavy equipment, this is the difference between a job that drags on and a job that gets done right. The DIY guy with a D155A-6 on his property? You need this too. One mistake on the final drive assembly can cost you thousands. The manual includes the standard service value table for engine and machine – so you know exactly what’s acceptable wear and what needs replacement. It also covers the undercarriage, including track frame, recoil spring, idler, track roller, and track shoe adjustment. The power train section alone covers the torque converter, PTO, and transmission components – including the ECMV and relief valves.

OEM vs Aftermarket: Why Factory Matters

I’ve seen aftermarket manuals that have the wrong torque specs for the steering clutch ECMV. That’s not a mistake you want to make. Komatsu’s own shop manual has the correct values, the correct wiring diagrams, and the correct hydraulic pressures. The manual is labeled with serial numbers 85001 and up, so you know it’s for your specific machine. The power train hydraulic piping drawing and the work equipment control piping diagram are all original factory prints. No reprints, no generic schematics. The manual also includes a section on emergency escape methods when the power train has trouble – real-world procedures that only Komatsu would document.

That’s the bottom line.

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The power train section covers the torque converter, PTO, and Manual Transmission”>Manual Transmission components. The transmission ECMV section requires understanding of Manual Transmission”>Manual Transmission fundamentals.

Frequently Asked Questions

Is this a factory OEM manual?

Yes. It’s the official Komatsu shop manual, not a reprint or aftermarket copy.

Does it cover the engine and cooling system?

Yes. Sections include radiator, oil cooler, engine mount, cooling fan pump and motor, plus valve clearance adjustment and compression pressure measurement.

What about the electrical system and troubleshooting?

The manual devotes multiple sections to the electrical system, including engine control, monitor system, KOMTRAX, and a full troubleshooting guide with failure code tables and E-mode, H-mode, and S-mode diagnostics. You’ll find wiring diagrams, sensor specs, and procedures for testing alternator belt tension, fan speed, and more.

Can I use this for a D155A-5?

No. This manual is specifically for the D155A-6 with serial numbers 85001 and up. Using it for a different model could result in incorrect torque specs and procedures.

Access the Factory Manual from AutoRepairManuals and get the 1331-page PDF. It’s the same manual Komatsu dealers use. Don’t waste time on generic garbage.