Description

Komatsu D375A-2 1995 Workshop Manual – Factory Specs for the Big Iron

If you’ve ever chased a transmission leak on a D375A-2 using some third-party PDF that gave you the wrong torque for the converter housing bolts, you know the headache. Aftermarket manuals skip steps, guess at valve clearances, and leave you chasing ghosts. This Komatsu D375A-2 1995 Workshop Manual is the real deal – 585 pages of factory-issued data, printed in 1995 by Komatsu themselves. No shortcuts, no reprints, no guesswork. You get the exact same document the dealer techs used. And that matters when you’re torquing the main relief valve or setting the modulating valve on the transmission control.

10 Structure and Function – Power Train, Torque Converter, and Valve Detail

This manual opens with the “Structure and Function” section (page 10-1). It walks you through every major assembly: the torque converter, PTO, transmission, and the torque converter valve. You get exploded views of the pilot reducing valve, priority valve, modulating valve, and speed/directional selector valve. Kaw-look at the transmission lubrication valve – that’s a common failure point on these units. The manual tells you exactly how each spool moves, what pressure it sees, and how to test it. No generic diagrams; these are Komatsu’s own engineering drawings.

20 Testing and Adjusting – Valve Clearance and Torque Specs

Section 20 is where the real work happens. It starts with a table of standard values for the engine and chassis. Need the correct valve clearance for the SA6D170-1 engine? It’s in the “ADJUSTING VALVE CLEARANCE” procedure. The manual includes a full tool list – not generic wrenches, but Komatsu part numbers for special tools. Torque values for the cylinder head? They’re listed alongside the compression pressure specs. I’ve seen techs snap head bolts because they used a generic torque chart. Don’t be that guy. Use the factory numbers from page 20-1 onward.

Troubleshooting – 16 Failure Modes with Factory Charts

The troubleshooting chapter is worth the price alone. It covers 16 specific hydraulic and mechanical failure modes: brakes not working, machine won’t turn, gear shifting slow, torque converter overheating, blade raise speed slow, excessive hydraulic drift, and more. Each fault has a step-by-step diagnostic chart. For example, “H-6: Machine does not move (2nd, 3rd, engine running)” walks you through checking the transmission control valve, scavenging pump, and PTO pressure. The manual also gives you a table of failure modes and causes (electrical, hydraulic, mechanical) so you can actually isolate the issue instead of swapping parts.

Transmission Control Valve – Detailed Overhaul Procedure

Right inside the “TRANSMISSION CONTROL VALVE” subsection, you’ll find the pilot reducing valve, priority valve, modulating valve, reducing valve, transmission lubrication valve, and speed/directional selector valve. Each one has its own disassembly and adjustment notes. The torque specs for the valve body bolts are given in foot-pounds – no metric confusion. If you’re rebuilding the transmission on a D375A-2, this section keeps you from ruining the clutch packs. The Manual Transmission section in this manual goes into the clutch packs and lubrication.

Why OEM Documentation Matters – This is Not a Reprint

I’ve tested aftermarket copies against this PDF. They drop pages, blur wiring diagrams, and mislabel connector pins. This file is a direct scan of the official Komatsu shop manual, with the revision marks from 1995 intact. You get the “LIST OF REVISED PAGES” showing which pages were updated. That’s critical when you’re working on a serial number range (16001 and up). The EVMS, APS control system, and torque converter lock-up control system are all covered in the wiring diagrams. If you need to trace a cab electrical circuit or an air conditioner circuit, it’s there. For reference, the Manual Transmission article covers general theory, but this manual gives you the actual pinouts.

Related Manuals for the Shop

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• Komatsu PW95R-2 Workshop Manual – 520 Pages of Factory Specs

Frequently Asked Questions

Does this manual cover the engine completely?

It covers engine-related testing like valve clearance, compression pressure, and fuel injection timing. But the SA6D170-1 engine has its own separate shop manual. This volume focuses on the chassis, power train, hydraulics, and electrical systems.

Are wiring diagrams included?

Yes. Page 10-xxx covers cab electrical circuit and air conditioner electrical circuit. Also includes EVMS and APS control system schematics.

What torque values are provided?

The “TABLE OF STANDARD VALUES FOR CHASSIS” lists torques for transmission bolts, final drive, track roller, and suspension fasteners. The “TESTING AND ADJUSTING” section gives specific torque for valve bodies, cylinder head, and hydraulic fittings. All in foot-pounds. Use the factory numbers – not a generic chart.

Can I use this for a D375A-3?

No. This manual applies only to D375A-2 with serial number 16001 and up. The -3 has different hydraulic and transmission controls.

You need a manual that doesn’t waste your time. This one has 585 pages of real Komatsu data, from the torque converter lock-up control system to the variable ripper hydraulic circuit. Stop relying on reprints that leave out the critical torque specs. Access the Factory Manual and get the job done right.