Komatsu WA470-3 / WA470 Avance Wheel Loader 2001–2008 Shop Manual Set (P/N SEBM006307)

Matching the publication and serial-specific section to the loader helps avoid using test data, hydraulic layouts, controller connections, or replacement components intended for a different build.

Engine and wiring scope: These chassis volumes include in-machine engine service and cylinder-head work; full internal engine overhaul requires the separate engine-series shop manuals. The H-series PDF retains wiring legends and insertion pages, but the referenced large-format full-machine and air-conditioning wiring foldouts are absent.

Text Search, Bookmarks, and PDF Contents

Search and diagram detail: Text search works only in selected sections of the 50001-up PDF. The H-series PDF is searchable across its main sections, although some troubleshooting text and headings have character-encoding limitations. Both files have embedded chapter and component bookmarks. Small connector, pin, and wire-code labels require zooming on dense circuit pages.

The ZIP download contains two printable PDFs totaling 1,883 pages. This total includes covers and front matter, five revision-list pages in the first volume, and 20 foldout-insertion pages plus blank pages in the H-series volume.

Power Train, Hydraulics, and Electronic Controls

These selected workshop topics are part of a broader contents list that also covers push-pull hydraulic couplers and hoisting guidance.

• Power-train repair: Step-by-step torque converter and transmission removal and installation, clutch-pack disassembly and reassembly, control-valve service, axle and differential work, and final-drive overhaul.

• Engine testing: Speed, boost, blow-by, compression, and oil-pressure checks, with engine-specific valve, injector, and fuel-injection adjustments.

• Hydraulics and steering: Pump and main control valve testing, PPC circuit diagnosis, emergency steering, hydraulic drift checks, and steering, boom, and bucket cylinder repair.

• Service and parking brakes: Pressure and accumulator checks, brake bleeding, wet-disc inspection, manual parking-brake release, and brake-component repair.

• Work-equipment controls: Bucket positioner and boom kick-out adjustment, auto-leveler and work-equipment-controller diagnosis, auto-shift, ECSS, and main and maintenance monitor checks.

• Shop references: Electrical and hydraulic schematics, controller diagrams, connector and pin-location views, fault-code charts, standard-value tables, torque data, fluid specifications, wear limits, and special-tool part numbers.

Written for service personnel, these manuals cover workshop procedures that require hydraulic test equipment, lifting gear, and component-support arrangements.

Serial-Specific Power-Train Revisions

The 50001-up publication pairs the S6D125 engine with the TCA38-8A converter and separates mechanical-shift from optional auto-shift/ECMV configurations.

At 54001, the transmission filter changes from a center-bolt to a spin-on design, and the control documentation introduces a combined transmission and travel-damper controller with ECSS functions. Proportional-solenoid designs change again at 54101.

The H-series publication distinguishes the S6D125-1, Cummins MTA11 (STC), and SA6D125E-2 engine builds with the TCA38-4Z converter. Further sections separate emergency-steering, monitor, auto-transmission-pilot, brake, hydraulic-safety, and electrical revisions, including breaks at WA470H21065, WA470H21104, and WA470H21164.

Transmission, Axles, and Center-Hinge Work

Oil-flow diagrams trace clutch application through the main relief and priority valves, selector valves, ECMV, accumulator and flow valves, and emergency manual spool. Stall tests and torque-converter/transmission pressure checks accompany the shift-fault diagnosis.

Clutch-pack procedures identify piston seals, separator plates, friction discs, wave springs, and end plates.

Standard and limited-slip differential sections cover bearing preload, ring-and-pinion backlash, and tooth contact. Center-hinge procedures retain shim and spacer positions; transmission assembly notes call out PTO gear orientation and the easily omitted idler spacer.

Steering, Brakes, and Work-Equipment Hydraulics

Steering coverage follows the steering valve, orbit-roll unit, demand valve, emergency-steering arrangements, and pressure tests. Brake sections distinguish service- and parking-brake circuits, accumulators, charge valves, and slack adjusters, with stopping-performance checks.

Work-equipment material covers PPC valves, the main control valve, hydraulic safety system, boom and bucket cylinders, linkage, and bucket. The valve procedures identify spool, spring, and shim positions, while work-equipment tests include hydraulic pressure, operating speed, and drift.

Electrical Fault Isolation and Controller Setup

The Transmission Hydraulic Circuit Diagram, Brake Hydraulic Circuit Diagram, and Work Equipment Hydraulic Circuit Diagram support oil-flow tracing. Electrical references include the Engine Starting Circuit, Kick-Down Electric Circuit Diagram, and Connection Table for Connector Pin Numbers, alongside transmission cut-off schematics, engine stop/preheat circuits, and auto-shift/ECSS controller diagrams.

Troubleshooting is organized by engine performance, main and maintenance monitors, electrical faults, transmission control, hydraulic and mechanical chassis complaints, and ECSS. The 50001-up volume adds work-equipment-controller fault diagnosis and boom/bucket angle-potentiometer adjustment; monitor setup and sensor checks are also covered.

Engine Service, A/C Diagnosis, and Chassis Removal

Engine procedures extend to cylinder-head and auxiliary-component removal and installation, radiator service, and complete engine removal and installation.

The H-series A/C section adds evacuation and vacuum testing, refrigerant-level checks, compressor and magnetic-clutch work, and fault charts for blower, actuator, temperature-control, and cooling complaints. Its filling instructions specify an air-conditioning specialist.

Cab, counterweight, fuel-tank, and work-equipment removal and installation are included. The H-series volume also provides tire-changing procedures and a garage-jack adapter drawing.

Special Tools and Assembly Cautions

Tool references include multi-tachometer 799-203-9000, hydraulic tester 799-101-5002, clutch-pack lifting tools 793-615-1310 / 793-615-1320, center-hinge push-puller 790-101-2300, and cylinder repair stands 790-502-1003 / 790-502-2000.

Parking-brake plates, discs, wave springs, and the marked end plate must retain their specified arrangement to avoid brake drag and overheating. Cylinder assembly cautions address damage to rod packing, dust seals, O-rings, and backup rings from forcing sealing parts into position.

Raised equipment, stored hydraulic and accumulator pressure, wet brakes, and heavy driveline, axle, or transmission assemblies present serious injury and machine-damage hazards. Qualified technicians need the applicable Komatsu publications, secure supports, suitable lifting equipment, and the specified test and repair tools.

A Preview of Hydraulic Capacities and STC Adjustment Data

The 50001-up volume lists a specified hydraulic-system capacity of 294 liters for serials 50001–52999 and 280 liters for the 53001–53999 and 54001-up groups. These total-system figures are listed separately from routine refill quantities.

For the Cummins MTA11 (STC) engine on WA470H20669–WA470H20941 machines, the valve-and-injector section specifies 0.35 mm intake and 0.68 mm exhaust valve clearance, with the engine cold and stabilized coolant at 60°C or below. It also lists 0.6–0.7 Nm top-stop injector preload.