Komatsu WA500-3 / WA500-3H Wheel Loader 2001–2005 Shop Manual Set (P/N SEBM009014)

The publications cover different machine configurations; select the book matching your loader's model and serial range. Both follow Komatsu's six-section shop format.

Engine repair scope: Full engine overhaul requires the separate 6D140-2 or 140-3 Series Engine Shop Manual. The WA500-3H book also refers engine testing and engine-component disassembly/assembly to the 140-3 engine manual, which is not included.

PDF Search, Bookmarks, and Circuit Detail

Search and diagram detail: WA500-3 text search works on only a small portion of the file; WA500-3H text is broadly searchable, with exceptions in drawing labels and two A/C flowcharts. Both PDFs have section and component bookmarks. Small wiring labels require zooming, and WA500-3 circuit lettering is noticeably softer.

The ZIP contains two printable PDFs totaling 2,260 pages, including both original covers, five WA500-3 revision-list pages, and the remaining factory front matter.

Powertrain, Loader Hydraulics, and Electronic Controls

These selected coverage highlights summarize major workshop topics. Other examples include push-pull hydraulic coupler handling and coolant-selection guidance.

• Powertrain repair: Step-by-step damper, torque-converter and transmission procedures, plus transfer, drive-shaft, axle, differential and final-drive disassembly, inspection, reassembly and adjustment.

• Hydraulics and steering: Pump testing, PPC and main-control-valve service, cylinder overhaul, pressure diagnosis, hydraulic bleeding and steering-linkage adjustment.

• Brake service: Service-brake performance and disc-wear checks, parking-brake testing and manual release, accumulator checks, and brake-component repair.

• Control setup: Transmission-controller initial teaching, main-monitor setup, ECSS and joystick-steering diagnosis, bucket-positioner adjustment and boom kick-out settings.

• Electrical troubleshooting: Connector inspections, failure-code tables and decision trees for chassis circuits, transmission controls, main monitor, ECSS, joystick steering and air conditioning.

• Diagrams and views: Transmission cutaway, serial-specific electrical circuits, connector and 3D connector-arrangement diagrams, and work-equipment/steering hydraulic circuits.

• Factory reference data: Torque tables, fluid data, pressure-test specifications, electrical checks, wear limits, clearances, bearing preload, gear backlash and maintenance-standard drawings.

These manuals are written for workshop service personnel; major component repairs require the lifting equipment, test instruments and special tools specified in the procedures.

Engine Service and the Serial Break

Earlier WA500-3 machines use S6D140E-2 fuel-injection-pump, nozzle-holder and injection-timing material. From serial 52001, SA6D140E-3 coverage adds fuel-supply-pump and injector service, fuel-pressure release and leakage checks, reduced-cylinder testing, common-rail diagnostics and engine-controller fault trees.

The WA500-3 repair chapters also cover selected in-chassis tests and removal/installation of the cylinder head, turbocharger, water pump, engine oil cooler, front and rear seals, radiator and engine assembly. Serial notes identify the applicable configuration.

Transmission and Differential Variants

Electronic Control Modulation Valve (ECMV) chapters explain clutch engagement, transmission-control signals, kick-down/hold functions and electric parking-brake logic. WA500-3 transmission construction and maintenance-standard pages distinguish T/M No. up to 10825 from 10826 and up.

The WA500-3 book contains normal and limited-slip differential repair procedures. WA500-3H explains optional limited-slip operation, while its differential overhaul chapter covers the normal, standard unit.

Torque-converter stall checks, ECMV clutch-pressure tests and hydraulic-circuit flushing connect diagnosis with overhaul work. The assembly cautions explain how forcing the torque converter into position can damage the input-shaft seal ring.

Loader Hydraulics and Steering Circuits

Structure chapters trace flow through the hydraulic, steering, switch and PPC pump circuits, accumulators and positioner circuits. Component procedures address Orbit-roll and orbital steering valves alongside loader valves and cylinders.

Hydraulic and control circuits change at the WA500-3 engine serial break. The post-repair bleeding cautions explain why high engine speed or full cylinder travel before trapped air is removed can damage piston packings.

Controller Setup and Electrical Fault Tracing

The transmission-controller sections explain why clutch-learning data must be reset after transmission replacement or overhaul. Monitor adjustment, wiring sheets and connector layouts are also divided by the WA500-3 serial break.

Connector-pin tables and wiring diagrams for ECSS (Electronically Controlled Suspension System) and joystick steering support tracing faults between controllers, harnesses and components. Denso A/C diagnosis adds manifold-gauge charts, blower and cooling-circuit flowcharts, and controller error-message tables.

Workshop Tools and Repair References

Special-tool lists identify the 790-501-5200 repair stand, 792-525-1000 differential preload micrometer and 799-703-1200 R134a service-tool kit. Locally manufactured tool sketches provide workshop fabrication references.

Repair coverage also extends to the center hinge, work equipment, cab structures and air-conditioning components. Electrical wire codes, conversion tables and lubricant/coolant guidance accompany the component inspection standards.

WA500 loaders combine stored hydraulic pressure, heavy articulated structures, raised work equipment, electrical circuits, and refrigerant service. Use the manual matching the exact serial number and follow Komatsu's blocking, lifting, pressure-release, electrical-isolation, and refrigerant-recovery precautions before beginning repair work.

Selected Valve-Clearance and Brake-Wear Specifications

For the WA500-3H's SA6D140E-3 engine, the in-chassis table lists cold valve clearances of 0.35 mm intake and 0.57 mm exhaust. The adjustment procedure is in the separate engine manual.

The WA500-3H brake-disc wear test specifies a brake oil pressure of 50 ±5 kg/cm². Its piston-stroke reference is 2.2–5.5 mm for a new machine, with an 8.5 mm service limit.