Description

Komatsu D39EX-22, D39PX-22 Workshop Manual – Factory OEM Specs for Your Bulldozer

If you are turning wrenches on a D39EX-22 or D39PX-22 bulldozer, you have already learned that generic aftermarket PDFs cost you time. Throttle response off. Track tension wrong. Hydraulic pressure numbers that do not match what the machine actually needs. That is why I only use factory OEM manuals on my shop floor. This Komatsu D39EX-22, D39PX-22 Workshop Manual is the real print — not a third-party rehash. 1046 pages of Komatsu’s own data, serial-number specific for D39EX-3001 and up, D39PX-3001 and up. It covers the complete machine, from the ecot3 engine to the final drive sprockets.

1046 Pages of Factory Data – What You Actually Get

The manual opens with the index and foreword (Section 00), then moves straight into general specs: dimensional drawings, weight tables, and the table of fuel, coolant and lubricants. Every fluid spec is Komatsu-approved — use anything else and you risk seal damage or overheating. Section 10 dives into structure, function, and maintenance standard. That is where you find the cooling fan pump, oil cooler bypass valve, power train system diagrams, and the HST hydraulic equipment arrangement. Page count is 1046 for a reason: they did not cut corners. If you need to pull the HST pump or replace a carrier roller, the exploded views and clearance specs are right there.

Does This Manual Cover the Hydraulic System and HST?

Yes. Section 410 covers the hydraulic system in two parts. Part 1 walks through work equipment control, the control valve, and the CLSS (Closed Loop Swing System). Part 2 covers the blade PPC valve and accumulator. The HST pump and HST motor are detailed in Section 200 (Power train) with charge pump specs and solenoid valve outlet pressure test procedures. You get the factory test numbers for every circuit — not guesses. The standard tightening torque table in the foreword gives you foot-pounds for bolts from M6 to M30. That table saves torn threads.

7 Major Sections That Matter

• Engine and cooling system (10-100): Engine system parts, fan pump, fan motor, oil cooler bypass valve.
• Power train (10-200): Damper, HST pump, HST motor, final drive, steering and brake control.
• Undercarriage and frame (10-300): Main frame, idler, track roller, carrier roller, sprocket, track shoe.
• Hydraulic system (10-410/420): CLSS, control valve, blade PPC valve, accumulator.
• Work equipment (10-500): Cutting edge, end bit, ripper, cylinder, piston valve.
• Cab and attachments (10-600): ROPS cab, cab mount, canopy mount, air conditioner.
• Electrical system (10-700): Monitor system, engine control, cooling control, HST control, parking brake, KOMTRAX, PCCS lever.

Every one of those sections includes exploded diagrams, disassembly steps, and wear limits. The standard service value table in Section 20 gives you the bench specs for engine components and chassis parts. If you are chasing a low charge pressure, the testing and adjusting section (30) tells you which gauge to tee in and what the pressure should be.

Testing and Adjusting – Where the Real Work Happens

Section 30 is split into two parts. Part 1 covers engine-related tests: measuring compression pressure, blow-by pressure, engine oil pressure, fuel pressure, fan circuit pressure, and the no-injection cranking operation. Part 2 goes into the hydraulics and powertrain: adjusting decelerator pedal, testing HST oil pressure, measuring solenoid valve outlet pressure, testing travel deviation, adjusting parking brake lever, and the simple brake performance test. There is also a procedure for releasing the parking brake during an emergency escape — that alone is worth the manual if you ever have a dead machine on a slope. The tools list in Part 1 (page 1 of the testing section) tells you exactly what special tools you need; no guesswork with adapters that do not fit.

Why OEM Documentation Beats Aftermarket Reprints

I have seen aftermarket manuals that flip torque specs between SAE and metric, or skip the safety notice entirely. This Komatsu manual has a full safety notice right in the foreword, plus handling instructions for electric equipment and hydraulic components. The electric wire code is explained — wire colors, connector handling, and how to read the diagrams. That matters when you are troubleshooting a KOMTRAX system or a sensor circuit. Aftermarket reprints often blur the schematics. This OEM scan is clean. You can zoom in on the diagrams without losing line labels. Related manuals for other Komatsu models include Komatsu WA65-5 WA70-5 WA80-5 2005 Workshop Manual, Komatsu WH609-1E0 WH613-1E0 WH713-1E0 WH714H-1E0 WH716-1E0 Workshop Manual, and Komatsu PW95R-2 Workshop Manual – 520 Pages of Factory Specs. If you work on Manual Transmission systems in other equipment, the same factory rigor applies here. The transmission on this bulldozer uses HST, not a Manual Transmission, but the Komatsu manual treats every subsystem with equal detail.

Frequently Asked Questions

Is this manual for the D39EX-22 and D39PX-22 only?

Yes. Serial numbers D39EX-3001 and up, D39PX-3001 and up.

How does this OEM manual differ from aftermarket versions?

Aftermarket manuals often omit the factory safety notices, misprint torque values, and use low-resolution schematics that blur wire colors. This manual is a direct scan of the original Komatsu publication (Form No. SEN04041-05). It includes the standard tightening torque table, conversion table, and every test procedure with the correct pressures for your machine’s serial number range. The electrical section covers the full KOMTRAX system, engine control, and HST control with original wiring colors. You will not find a “CLSS” section in a generic manual — this one has it. I have compared aftermarket PDFs side by side with OEM; the OEM is the only one I trust when a customer’s dozer is down.

If you want to stop burning billable hours on bad data, get the real thing. Access the Factory Manual now and keep your Komatsu moving.