Komatsu WA380-3 / WA380-3H Wheel Loader Shop Manual Set, 2000–2005 (P/N SEBM006105)

These books cover separate machine families. Matching the machine serial number to the applicable volume and section helps you select the correct repair procedure, circuit layout, and inspection standard.

Both are machine/chassis shop manuals, rather than parts catalogs or operator manuals. Engine coverage includes diagnosis, cylinder-head and external-component work, and complete engine removal/installation, but not a full internal engine overhaul. Detailed S6D108 engine work requires the separate 108 Series Engine Shop Manual.

H-series wiring coverage: VEBM460104 includes component circuits, connector information, and wiring legends, but the referenced main-machine and WA380 air-conditioning wiring foldouts are absent from this download. Their replacement notices remain in the PDF.

PDF Search, Bookmarks and Diagram Detail

Search and viewing: SEBM006105 has no PDF text search. VEBM460104 is partially searchable; some text, particularly in troubleshooting sections, cannot be reliably found through search. Both PDFs have embedded bookmarks. Small schematic labels require zooming; some densely packed labels in SEBM006105 remain soft when enlarged.

The ZIP download contains two printable English PDFs totaling 1,754 pages. The totals include both original covers, four revision-list pages in SEBM006105, and 35 blank pages plus 24 foldout-placeholder pages in VEBM460104.

Powertrain, Hydraulic and Electrical Shop Coverage

The following selected contents outline the main workshop areas. Further topics include coating-material references and wiring-color identification.

• Engine checks and service: Compression, blowby, boost, oil-pressure and turbocharger checks; valve-clearance and injection-timing adjustment; cylinder-head, external-component, and complete engine removal/installation procedures.

• Transmission and axles: Torque-converter, transmission, clutch-pack, control-valve, accumulator-valve, differential, final-drive, axle-housing, drive-shaft, and center-hinge repair procedures.

• Steering and brakes: Orbit-roll and steering-valve service, steering-cylinder work, emergency steering, brake-performance and wear tests, bleeding, accumulator checks, and parking-brake service.

• Hydraulics and work equipment: Pump-group, PPC-valve, main-control-valve and cylinder service; pressure checks, bucket-positioner and boom-kickout adjustment, work-equipment removal, and ECSS/ALS diagnosis.

• Electrical troubleshooting: S, M, K, E, T, and D diagnostic sections address engine, monitor, electrical, chassis, and suspension faults through charts, circuit checks, and failure-code information.

• Cab and air conditioning: Cab, floor-frame and ROPS-cab procedures; air-conditioning unit, condenser, receiver-drier, and compressor removal/installation, with operating explanations and fault charts in the H volume.

• Diagrams and inspection data: Transmission hydraulic circuits, serial-specific brake circuits, work-equipment hydraulics, emergency-steering diagrams, ECSS/ALS schematics, component views, torque tables, and maintenance standards.

Komatsu prepared these manuals for service personnel; the procedures assume workshop experience and access to suitable lifting, hydraulic-test, and electrical-test equipment.

Serial-Specific Configurations

The WA380-3 book distinguishes earlier and later machines in its specifications and selected cab, engine-component, PPC-valve, and cylinder procedures. Its accumulator charge-valve coverage also follows a separate early-production serial break.

The H volume separates S6D108 installations from S6D114E-1 installations beginning at H20501. Brake circuits, main control valves, emergency steering, and work-equipment hydraulics have their own serial divisions, so one configuration should not be treated as representative of the entire H range.

Suspension information distinguishes ECSS, ECSS Plus, and ALS. Standard and High-Lift dimensional and weight tables are provided for H20051–H20500 machines. Optional systems and attachments shown may not be fitted to every loader.

Electrical Fault Tracing

Starting, stopping, preheating, kick-down, and transmission cut-off circuits explain how switches, relays, sensors, and solenoids interact. Connector pin arrangements, relay locations, electrical test values, and fault charts support tracing a symptom to the affected circuit.

The WA380-3 volume adds W-mode work-equipment controller troubleshooting. The H volume adds A-mode automatic-transmission controller troubleshooting, including auto-shift control and combined transmission/ALS controller information.

Tools, Inspection Standards and Assembly Cautions

Special-tool tables identify the 799-101-5002 hydraulic tester, 793-605-1001 brake test kit, 793-415-1210/1220 transmission lifting tools, and 793-422-1120 differential-pinion mandrel. Component weight tables support lifting plans; maintenance standards provide inspection dimensions, clearances, wear limits, and repair criteria.

The S6D114E-1 valve-adjustment section warns that an engaged timing pin can be damaged during engine rotation. Differential assembly notes explain how changing total shim thickness disturbs bearing preload, while hammering the brake piston can damage its D-ring and piston.

Safety notice: Always follow the complete safety and procedure information in the applicable manual and established shop protocols. Secure the articulated frame and wheels, support raised work equipment, release hydraulic and accumulator pressure, isolate the battery, and use rated lifting equipment before service.

Valve-Clearance and Positioner-Setting Preview

For S6D114E-1 installations beginning at WA380H20501, the valve-adjustment section specifies intake clearance of 0.30 mm and exhaust clearance of 0.61 mm with the engine cold, below 60°C.

The H-volume maintenance standards specify a 3–5 mm clearance at both the bucket-positioner switch and the boom-kickout switch. These component-specific settings accompany the related illustrations and adjustment information.