Description

Komatsu WA380-6 2007 Workshop Manual

If you’re wrenching on a Komatsu WA380-6 2007 Workshop Manual machine, you already know the cost of guessing. The wrong torque on a main relief valve – or worse, on a final drive – gets you a comeback job that eats your profit. This factory manual ends that. I’ve been turning wrenches since before hydraulic pilot systems were common, and I trust this binder because it was printed by Komatsu, not some third-party who copied the wiring diagram off a fax machine.

1303 pages of real data. Screws, seals, and pressure specs that match the parts counter. Page 3 gives you the machine identification – serial number H60051 and up – and page 4 details how the shop manual is structured. You don’t get that from a PDF scraped off a forum.

1303 Pages of Factory Data – What It Covers

The manual is split into sections that match the actual machine systems. Section 01 has the specification drawing, weight table, and the table of fuel, coolant and lubricants. Section 10 is the heavy stuff: engine and cooling system, power train, steering, brake, hydraulic system in two parts, work equipment, cab, and three electrical system sections. If you need to know the charge pressure for the brake accumulator, Section 10 has the charge valve breakdown. If you’re pulling the transmission, the ECMV and main relief valve specs are all there.

Section 20 gives you the standard service value table – wear limits for the SAA6D107E-1 engine and chassis components. Section 30 is the testing and adjusting procedures: measuring engine speed, compression pressure, blow-by, oil pressure, and all the fuel system handling steps. Section 40 covers troubleshooting by failure code. That’s where you save hours of diagnostic time.

Torque Specs: Why the Factory Table Matters

The standard tightening torque table is in the index and foreword. You don’t need to convert from Newton-meters or guess – it’s listed in Imperial units as the machine is sold in North America. Every bolt in the steering column, the orbit-roll valve, and the parking brake solenoid valve has a torque spec. Skip this and you’ll be chasing hydraulic leaks or, worse, a wheel that comes loose on the job site.

Hydraulic System, Part 1 and Part 2: Diagnostic Depth

Part 1 includes the hydraulic piping diagram, work equipment control valve, CLSS, and each function of every valve. Part 2 covers the PPC valve, stabilizer valve, and accumulators for both PPC and ECSS circuits. If the bucket positioner isn’t kicking out or the boom kick-out stops working, you trace the wiring and hydraulics from these diagrams. The manual also explains how to release residual pressure in the fuel system – a step that many skip and then get fuel injection components damaged.

OEM vs Aftermarket Documentation

I’ve seen aftermarket manuals that list the wrong final drive ratio or skip the emergency steering pump maintenance procedure. This Komatsu workshop manual is the original OEM print. The wiring diagrams match the actual harness pinouts. The torque converter relief valve specs are factory-verified. If you compare a third-party manual side by side, the difference is night and day – especially on the electrical system sections where pin numbers and wire colors have to be exact.

For example, the power train system diagram includes the drive shaft and flow control valve. An aftermarket manual might show a generic schematic. Here, it’s Komatsu’s own drawing with callouts that match the parts book. That saves you the headache of ordering the wrong seal kit.

Related manuals you might need: Komatsu WA380-6 Workshop Manual – 1355 Pages of Factory Data and Komatsu WA380-6 2007 Workshop Manual – Factory Specs Inside. For other Komatsu models, check Komatsu WA65-5 WA70-5 WA80-5 2005 Workshop Manual.

FAQ

Is this manual the same as the OEM paper manual?

Yes, it’s a direct digital copy of the factory-issued shop manual.

What engine does the WA380-6 use?

The WA380-6 mounts the SAA6D107E-1 engine. The manual covers engine specs on page 3, including valve clearance adjustment procedures, compression testing, and blow-by pressure measurement. Section 30 has detailed testing procedures for engine speed, oil pressure, and fuel system diagnostics. If you are rebuilding the engine, the standard service value table in Section 20 gives you the wear limits for pistons, rings, and bearings. That alone makes this manual worth the price. The torque converter and transmission section also cross-references with the Manual Transmission information if you’re dealing with the driveline.

If you need to understand how the power train pump and work equipment pump connect to the transmission controller, the electrical system Part 2 covers the transmission controller system, including the kickdown switch and hold switch. Use the KOMTRAX terminal system diagrams to diagnose electronic issues. When servicing the transmission, treat it like you would a Manual Transmission – follow the factory procedure exactly, from flushing the torque converter circuit to adjusting transmission speed sensors.

This manual is not a reprint or a scan of a scan. It’s the original OEM file, 1303 pages, with searchable bookmarks. You can get the exact procedure for measuring and adjusting power train oil pressure or bleeding air from the fuel circuit. Don’t rely on a forum post. Access the Factory Manual and get the job done right the first time.