Komatsu WA400-1 Wheel Loader Shop Manual (P/N SEBM04240106)
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Komatsu Models Covered & Key Technical Specifications
Models: WA400-1
Model Years: 1990–2005
Serial Numbers: 10001 and up
Technical Data:
- Engine: Komatsu SA6D110-1, 6-cylinder, 4-cycle, water-cooled, direct-injection, 7,127 cc displacement
- Engine Performance: 197 HP at 2,200 rated RPM, 80 kgm maximum torque at 1,500 RPM
- Operating Weight: 17,840 kg (with cab)
- Bucket Capacity: 3.1 m³ heaped
- Transmission: Planetary type (Komatsu KTM4422), 4-speed forward/reverse
- Hydraulic System: Gear pump (tandem type), 398 l/min delivery, 210 kg/cm² set pressure
- Brake System: Independent wet-type multiple disc, air-operated hydraulic type
- Electrical System: 24V, 7.5kW starting motor, 24V 35A alternator, 24V (12V x 2) 150Ah battery
Komatsu Manual Features & Content Preview
- Official 775-page OEM shop manual detailing the 1990–2005 Komatsu WA400-1 wheel loader for serial numbers 10001 and up.
- Original publication Form SEBM04240106 (dated 08-90(03)05501).
- Features 124 exploded-view diagrams, 8 detailed system schematics, and 14 technical specification tables.
- High-resolution 600 dpi format preserves fine detail on diagnostic trouble codes and complex wiring layouts.
Component and System Documentation
Navigating heavy machinery maintenance requires exact tolerances. This factory literature delivers comprehensive technical data organized by major machine groups, specifically structured to streamline a technician's diagnostic workflow. The engine section documents the architecture, testing parameters, and teardown logic of the Komatsu SA6D110-1 unit. Moving to the drivetrain, the manual covers the torque converter, planetary transmission, and final drive gear reduction systems in high detail. Articulated body steering and wet-type multiple disc brake assemblies are thoroughly mapped out, providing the baseline inspection standards required for professional shop environments.
Essential Operational Data
Having immediate access to correct fluid capacities and pressure settings minimizes downtime in the service bay. The hydraulic system features a tandem-type gear pump with a designated delivery rate of 398 l/min at 2,200 RPM, operating under a strict 210 kg/cm² pressure baseline. Engine oil pan capacity is rated at 24 liters for a complete refill, while the total cooling system holds 52 liters of fluid. Within the cylinder head geometry, intake valve clearance is tightly specified at 0.25 mm. Assembly integrity relies heavily on exact fastening procedures. Cylinder head bolts must follow a strict multi-stage torquing sequence, with final-stage values peaking at 18–20 kgm.
Working with industrial construction equipment presents inherent physical hazards, especially when dealing with high-pressure hydraulics and massive drivetrain components. Technicians must verify all factory safety parameters prior to initiating mechanical work, utilizing this document as the definitive repair baseline rather than relying on standard operational assumptions.
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