Description

Komatsu WA470 2000 Service Manual

If you’re tearing into a Komatsu WA470 transmission without the factory Service Manual, you’re asking for a comeback job. I’ve been wrenching since the ’90s, and I’ve watched guys throw torque wrenches across the bay because some aftermarket reprint had the wrong spec. This is the genuine article: the Komatsu WA470 2000 Service Manual, 986 pages, direct from the factory. It covers serial number WA470H20051 and up, with three separate sub-ranges for dimensions, weights, and lubricant specs. You need the final drive torque? It’s in the Torque List in Section 01. You need the transmission hydraulic circuit diagram? Section 10. Don’t guess — use the book that Komatsu techs used.

Safety warnings are printed on page 3. Read them before you so much as crack a bleeder screw.

Torque List: The First Thing You Check

Section 01 has a dedicated torque list that covers every critical fastener on this machine. The transmission control valve, the axle mount bolts, the steering relief valve — all spec’d in imperial units. I’ve seen stripped threads on a final drive because a mechanic used a generic chart. This manual gives you the Komatsu-approved number. Period. You also get weight tables and lubricant recommendations broken down by serial number range — WA470H20668 and earlier, H20669 through H20941, and H20942 up. You don’t have to guess which oil goes in the differential.

Testing and Adjusting: Standard Values You Cannot Ignore

Section 20 is where the real work happens. It lists standard value tables for the engine (both the S6D125-1 and SA6D125E-2, depending on serial number) and for the chassis. You get step-by-step procedures for measuring stall speed, torque converter pressure, and steering oil pressure. The manual includes a test certificate format so you can document your results. There’s also a procedure for adjusting the engine motor stop cable and the accelerator pedal basic adjustment. If you’re doing a valve clearance adjustment on the SA6D125E-2 engine, the spec is in there. Use it.

Does the Komatsu WA470 2000 Service Manual Cover the Transmission Hydraulic System?

Yes. Section 10 — Structure and Function — devotes multiple chapters to the power train. You’ll find the transmission hydraulic system diagram, the transmission hydraulic circuit diagram, and detailed breakdowns of each component: torque converter, clutch, transmission control valve, solenoid valve, main relief valve, priority valve, directional selector valve, and the emergency manual spool. There’s even a chapter on the Electronic Control Modulation Valve (ECMV). For brake system diagnostics, it covers the brake valve, charge valve, slack adjuster, and accumulator units. Combine this with the Komatsu WA470 Electrical Circuit Diagram 1/8 for complete electrical troubleshooting.

3 Reasons to Choose Factory Komatsu Documentation

First, aftermarket manuals often omit the torque values for sub-assemblies like the PPC valve or the cut-off valve. This one has them. Second, the wiring diagrams in the back of Section 10 are exact — not redrawn by some third party who doesn’t know the difference between a relay and a resistor. Third, the disassembly and assembly procedures in Section 30 follow the same sequence Komatsu trains its own techs on. If you’re rebuilding the transmission, you need the clutch clearance specs from Section 40 (Maintenance Standard). I’ve seen too many shadetree guys put a transmission back together with no feeler gauge.

Structure and Function: Power Train and Brake Systems

The manual breaks the machine into logical systems. The power train section covers everything from the torque converter outlet port valve to the axle mount and center hinge pin. The brake section includes a brake circuit diagram, slack adjuster procedure, and parking brake valve inspection. For hydraulics, it details the work equipment hydraulic system diagram, the PPC valve, the main control valve, and the safety valve with suction. There’s even a chapter on the Electronic Controlled Suspension System (E.C.S.S.) and the ALS system. If you need to understand the transmission auto-shift control system, it’s all there — including the transmission controller and sensor locations.

For related documentation, check the Komatsu WA470 Workshop Manual for additional disassembly tips. The transmission control valve is covered in more depth in the Komatsu WA470 WA480 Transmission Control Valve Manual. And for readers unfamiliar with the difference, the WA470 uses a powershift transmission — not a Manual Transmission. This manual meets the same quality standards you’d expect from any OEM service book in the Automotive Industry Overview — though heavy equipment is a different beast.

Frequently Asked Questions

Does this manual include wiring diagrams?

Yes, Section 10 has full wiring diagrams for the entire machine.

What serial numbers does it cover?

WA470H20051 and up. The manual breaks the serial range into three sub-groups: up to H20668, H20669 through H20941, and H20942 up. Each group has its own specifications and lubricant tables. You get the correct data for your specific machine.

Can I use this for a WA480?

No. This manual is specifically for the WA470 wheel loader. The WA480 has different dimensions, axle ratios, and hydraulic pressures. Using the wrong torque values could damage components. Get the correct manual.

Are the torque values in imperial units?

Yes. The torque list in Section 01 gives foot-pounds. All measurements throughout the manual use imperial units as standard for the North American market.

You need this on your shop tablet or printed out — the Komatsu Service Manual is the difference between a job done once and a job done twice. Access the Factory Manual now from AutoRepairManuals and stop relying on internet forum guesses.