Komatsu WA320-7 2013 Workshop Manual

Aftermarket manuals will leave you guessing on Komatsu hydraulic pressures. I have seen it cost shops a full day of diagnostics. The Komatsu WA320-7 2013 Workshop Manual puts factory-authorized numbers in your hands—2039 pages of spec sheets, torque tables, and wiring diagrams that Komatsu engineers wrote for the 6D107E-2 engine. No guesswork.

Komatsu WA320-7 2013 Workshop Manual: Scope and Coverage

Serial numbers A36001 and up are covered. Section 01 (Specification) gives weight tables, fuel and coolant capacities in imperial units. Section 10 (Structure and Function) breaks down the EGR system, KDPF, cooling fan motor, and the HST pump. Need the limited slip differential specs? They are in the Power train subsection of section 10.

2039 Pages of Factory Data

Thickness does not always mean quality, but here it does. The manual includes seven main sections: 00 Index and foreword, 01 Specification, 10 Structure and function, 20 Standard value tables, 30 Testing and adjusting, 40 Troubleshooting, 50 Disassembly and assembly, 60 Maintenance standard, 80 Appendix, 90 Diagrams and drawings. Page 30-1 starts the testing and adjusting section with tools required for boost pressure tests, fuel pressure tests, and valve clearance adjustments. Every procedure references standard value tables on page 20-1 so you can compare your measurements against factory limits.

Torque Specs and Fluid Capacities

The standard tightening torque table in section 00 lists fastener specs for every major assembly. The table of fuel, coolant, and lubricants in section 01 tells you exactly what fluid grade and quantity to use. Do not assume a generic hydraulic oil will work—this loader uses specific viscosity ratings for the HST system.

Why You Need the Testing and Adjusting Section

Section 30 is where you spend most of your time if the loader runs rough or won’t start. It covers testing engine speed, boost pressure, compression pressure, blowby pressure, and fuel system leakage. The procedure for bleeding air from the fuel system is laid out step by step. It also includes the cylinder cutout mode and no-injection cranking operation for diagnostics. I have used these procedures to isolate a bad injector on a WA320-7 in under an hour. You also get the handling of cylinder cutout mode operation and no-injection cranking operation. These are not generic steps—they are Komatsu-specific.

Electrical System Diagnostics: Factory Procedure

The electrical system section within 10 covers the engine control system, preheating, parking brake control, and the KOMTRAX telematics interface. Wiring diagrams are in section 90. If you get a fault code for the battery disconnect switch or the system operating lamp, the manual gives the diagnostic logic. Do not trust a third-party wiring diagram on this machine—the Komatsu color coding and pin numbers are specific to this harness layout.

The Difference Between OEM and Aftermarket Manuals

Aftermarket manuals often omit the KCCV ventilator maintenance, the EGR cooler testing procedure, and the correct slack adjuster clearance. They also reuse generic torque values. This manual has the Komatsu stamp on every page. It includes the practical use of KOMTRAX and the handling of intake system parts to prevent contamination. If you buy a reprint, you lose the high-resolution diagrams. This is a direct PDF of the 2013 factory print. Related manuals include Komatsu WA320-7 Shop Manual, Komatsu WA65-5 WA70-5 WA80-5 2005 Workshop Manual, and Komatsu WH609-1E0 WH613-1E0 WH713-1E0 WH714H-1E0 WH716-1E0 Workshop Manual. For additional background on gearbox fundamentals, read about Manual Transmission and Manual Transmission in specialized resources.

FAQ

Does this manual cover the preheating system?

Yes, section 10 covers the preheating system control logic and component locations.

What serial numbers are included?

Serial numbers A36001 and up for the WA320-7 model. Check the title page for the exact range printed.

Are there hydraulic circuit diagrams?

Section 10 includes the hydraulic circuit diagram and names of valves. The CLSS (Closed Center Load Sensing System) is detailed with pressure reducing valves, PPC valve, and ECSS accumulator. Section 90 contains full color diagrams for the hydraulic system. If you need to trace a pressure drop, the diagram shows every valve port. I would not attempt a control valve rebuild without these schematics.

Is the manual a PDF download?

Yes, immediate PDF download after purchase.

You have the loader down for maintenance. Do not waste time on generic instructions. Download the Factory Manual and get the job done with the right specs.