Description

Komatsu WA380-5H 2002 Workshop Manual – 1170 Pages of OEM Specs

I have torqued more head bolts than most people have had hot meals. Twenty-eight years in the shop, and I will tell you straight: if you are working on a Komatsu WA380-5H 2002 Workshop Manual machine, you need the factory spec, not a guess. This is the OEM manual – 1170 pages of what Komatsu wrote when they built the loader. No aftermarket condensation, no third-party translations. Just the real data.

You get the full contents from the original binder: SAFETY (page 00-3), GENERAL specs, STRUCTURE AND FUNCTION covering the Cooling System, Engine Mount, Transmission Mount, Power Train, Torque Converter, Transmission, Axle, Differential, Steering, Brake, Hydraulic piping, Work Equipment, Machine Monitoring System, Transmission Control System, and more. Then TESTING AND ADJUSTING with standard value tables for engine and chassis, procedures for measuring compression pressure, blow-by, oil pressure, brake pressure, accumulator charge pressure, and the detailed DISASSEMBLY AND ASSEMBLY section. That is the kind of depth you need when a customer is watching the clock.

Torque Specs: The Real Numbers

Standard tightening torque is listed in the SAFETY section. I have seen too many shops use a generic bolt torque chart and then wonder why the steering valve leaks. This manual gives you the Komatsu-specified values – not a range, not a suggestion. The torque values are exact. When you are putting together a final drive or a differential, you need that number. Anything else is a gamble.

Cooling System and Engine Overhaul

The Cooling System chapter (part of STRUCTURE AND FUNCTION) explains the flow, the fan motor, the drive pump. The Engine mount and Transmission mount sections show you the exact brackets and isolators. If you are pulling the SAA6D114E-2 engine, you need to know the mounting points and the torque sequence. The manual covers that. It also includes the full testing procedures for engine speed, exhaust color, valve clearance, and injection timing. I have used this manual to set the fuel injection timing on a WA380-5H – it is spot on.

Transmission and Power Train: Factory Procedures

The Transmission section goes through the torque converter (with and without lock-up clutch), the transmission control valve, the drive shaft, and the axle. There is a Power Train System Diagram that shows the oil flow. If you ever have to flush the torque converter and transmission hydraulic circuit, the procedure is in TESTING AND ADJUSTING. It even tells you how to move the machine when the transmission valve fails. That is not something you find in a generic manual.

For the DIY mechanic or the shop owner, this is the difference between a repair that lasts and one that comes back. I have seen aftermarket manuals skip the parking brake solenoid valve adjustment or the charge valve test. This one does not. It covers the Komatsu WA380-5H Service Manual – 299-Page OEM Shop Manual if you need a smaller version, but for the full job, you want the 1170-page Workshop Manual.

Why OEM Beats Aftermarket

I have a stack of aftermarket manuals in the corner of the shop. They get used for fire starters. The problem is they copy the data but leave out the safety notices, the hoisting instructions, the coating materials list, and the electric wire code. This manual has all of that. It also includes the conversion table and units. The Foreword tells you how to read the shop manual. That might sound basic, but when you are in a hurry, you need to know where the spec is. The OEM manual is laid out the way Komatsu intended – no guesswork.

Does This Manual Cover the Fuel System?

Yes – the engine section covers the fuel injection timing adjustment, bleeding air from the fuel circuit, and adjusting the engine stop solenoid. The standard value table for engine includes compression pressure and blow-by pressure. If you are working on the fuel system, you will find the procedures in TESTING AND ADJUSTING. The manual also covers the sensors and the engine starting/stop circuits. For more on manual transmissions in general, you can check Manual Transmission basics, but for this specific loader, stick to the OEM data.

Related manuals that cover the same family: Komatsu WA65-5 WA70-5 WA80-5 2005 Workshop Manual and Komatsu WH609-1E0 WH613-1E0 WH713-1E0 WH714H-1E0 WH716-1E0 Workshop Manual.

Does this manual include wiring diagrams?

It includes the electric wire code and machine monitoring system, but not full wiring harness diagrams. The engine starting/stop circuits and sensor circuits are covered.

What torque values are listed?

The STANDARD TIGHTENING TORQUE section (page 00-2) provides a table of bolt and nut torques for various thread sizes. Additionally, each component section – like the final drive, axle mounting, and steering cylinder – gives specific torque values for that assembly. You will find torque specs for the torque converter, transmission, and brake components. The values are in N·m and ft·lbf, with conversion tables included. If you are rebuilding a differential, you need those numbers, and they are all there.

Is this manual for the SAA6D114E-2 engine?

Yes. The manual states the WA380-5H mounts the SAA6D114E-2 engine. Engine testing procedures (compression, blow-by, valve clearance, injection timing) are all specific to that engine.

Can I use this for serial numbers before WA380H50051?

This manual covers machines with serial number WA380H50051 and up. Earlier machines may have differences. Check the serial number before ordering.

If you want to get this machine back to work without coming back at you, get the real data. Access the Factory Manual.