1994–2003 Komatsu WA600-3 & WA600-3D Wheel Loader Shop Manual (P/N SEBM013217)

This Komatsu shop manual, publication SEBM013217 (2007 edition), covers 1994–2003 WA600-3 and WA600-3D (TBG SPEC.) wheel loaders, serial numbers 50001 and up.

Supplied as one English-language 1,197-page PDF.

• Power train and axles: Torque converter and transmission disassembly, clutch assembly, differential and limited-slip differential repair, final-drive service, and inspection standards.

• Engine testing: Valve-clearance adjustment, compression and blow-by checks, fuel-injection timing, injector-lift adjustment, and engine-controller troubleshooting for the applicable serial ranges.

• Hydraulics and steering: PPC and main control valve service, orbit-roll removal, cylinder repair, steering-pressure testing, and steering stop-valve adjustment.

• Brake systems: Service and parking brake repair, slack-adjuster overhaul, brake-disc wear checks, and accumulator charge cut-in and cut-out pressure testing.

• Work equipment: Bucket positioner and boom kick-out adjustment, proximity-switch testing, linkage service, and auto grease system documentation.

• Electrical diagnosis: Wiring diagrams, main and maintenance monitor troubleshooting, automatic shift and joystick steering fault charts, and Electronically Controlled Suspension System (ECSS) diagnosis.

Written for service workshop personnel, this manual covers repair work requiring the specified test equipment, lifting equipment, and special tools.

Engine Variants and Repair Scope

Serial numbers 50001–52000 use the SA6D170E-2 engine; 52001 and up use the SAA6D170E-3. The cold-start sections distinguish the earlier Auto Priming System (APS) from later ECM-controlled automatic preheating.

Fuel-injection timing and cylinder-head removal and installation are documented for the earlier group. Later-machine procedures cover injector-lift adjustment, fuel-pump pressure testing, and bleeding air from the fuel circuit. Radiator removal includes the suction-fan configuration.

For full internal engine repair, the publication refers to the separate 6D170-2 and 6D170-3 Series Engine Shop Manuals. Those engine manuals are not included in this file.

Transmission and Axle Repair

The four-speed planetary transmission is documented with its control valves, torque converter cooling, and lubrication circuits. Power train specifications distinguish the TCA45-2B and TCA43-7B torque converters across the 52001 serial break.

Teardown sections cover the transfer, drive shafts, and differential assemblies, with inspection criteria for bearings, gears, and clutch components. Axle mounts and final drives have component-specific maintenance standards.

Drive-shaft reassembly notes warn that heat from welding the bearing-cap straps can damage the bearings.

Hydraulics, Brakes, and Work Equipment

Hydraulic testing separates steering, PPC, and work-equipment pressure checks. Repair chapters cover main control valve internals and lift, dump, and steering cylinders, alongside brake-system and hydraulic-cylinder air-bleeding procedures.

Brake-valve documentation distinguishes machines through 52018 from 52019 and up. Bucket positioner and boom kick-out designs are separated at 50269, with corresponding component layouts.

The PM clinic inspection tables bring engine, transmission, steering, brake, and work-equipment checks together for machine condition assessments.

Electrical Troubleshooting and Circuit Diagrams

Later-machine EA-mode troubleshooting covers engine-controller error codes, sensor circuits, and fuel-system actuators. Separate diagnostic chapters address joystick steering and automatic shift control.

Main monitor (speedometer module) adjustment covers machine-model settings, ECSS configuration, and tire-diameter correction.

Diagram coverage includes the Hydraulic Circuit Diagram for Power Train, Work Equipment Hydraulic Circuit Diagram, Brake Circuit Diagram, Schematic Diagram for Engine Control System, and Electrical Circuit Diagram for ECSS. General assembly drawings and component section views show assembly relationships.

The wiring appendix separates standard machines from joystick/automatic-shift machines within each main serial range. This helps technicians choose the applicable connector and circuit checks before tracing an electrical fault.

Service Specifications and Workshop References

Standard tightening torque tables cover metric bolts, flared nuts, and O-ring boss fittings. Component standards provide wear limits, clearances, hydraulic test values, and electrical test specifications.

Lubricant and coolant tables distinguish total system capacities from service refill quantities by serial range and identify ASTM D975 diesel fuel grades. Special-tool references include hydraulic tester 799-101-5002 and brake test kit 793-520-1805, with separate tool lists and sketches for disassembly work.

Review the factory safety precautions for articulation locking, supported work equipment, and residual hydraulic pressure before service.

PDF Navigation and Wiring Detail

The page total includes 28 pages of front matter, including the cover, revision list, safety/reference material, and one blank page, plus 17 pages in Section 90: its contents page and 16 wiring-diagram sheets.

Embedded bookmarks link the main sections and many individual procedures. Text search is available on only part of the PDF; many repair pages and wiring labels are not searchable. Small schematic labels require zooming.