Komatsu WA400-1 Wheel Loader Shop Manual

Troubleshooting, parts diagrams, and service data for Komatsu WA400-1 wheel loaders, including engine, power train, and hydraulics. Publication C4085-91017.

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Technical Safety Notice
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This official OEM document is intended for professional technicians and skilled operators. Performing service on mechanical equipment involves inherent risks. By purchasing, you acknowledge that RepairLoader provides original manufacturer data for informational purposes. Always prioritize safety: use correct tools, wear protective gear, and consult a certified professional if you are uncertain of any procedure.

Komatsu Models Covered & Key Technical Specifications

Models: WA400-1
Build 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
Technical Specifications
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Document Number / Seller:
27242 / Ashley Crawford
File Size:
95.24 MB
File Type:
ZIP
Language:
English
Pages:
775+
Printable:
Yes
Category:
Wheel Loader
Last updated / verified
Mar 14, 2026

Komatsu Manual Features & Content Preview

Technical Scope for the Komatsu WA400-1 Wheel Loader

  • Covers the 1990–2005 Komatsu WA400-1 wheel loader, including engine, power train, steering, brake, work equipment, and electric system assemblies
  • Original OEM publication, Form SEBM04240106, dated 08-90(03)05501
  • Includes 124 exploded-view diagrams, 8 detailed system schematics, and 14 technical specification tables
  • File resolution preserved at 600 dpi for maximum detail on diagnostic trouble codes and wiring layouts
  • Accessible from your device as soon as the order is placed
  • Suitable for printing individual sections for shop-floor use
  • This official 775-page shop manual documents the specific technical requirements for the 10001 and up serial number range, distinguishing it from later revision-based WA400 production cycles

Component and System Documentation

The Komatsu WA400-1 manual provides technical information organized by major machine group. The engine section documents the structure, testing, and disassembly of the Komatsu SA6D110-1 unit, while the power train segment covers torque converter, planetary transmission, and final drive gear reduction systems. Steering and brake sections detail the articulated body steering and wet-type multiple disc brake assemblies, providing the necessary specifications for maintenance and inspection standards.

Specification Highlights

The hydraulic system features a tandem-type gear pump with a delivery rate of 398 l/min at 2,200 RPM, documented alongside the 210 kg/cm² pressure settings. Engine oil pan capacity is 24 liters for a full refill. Valve clearance for the intake is listed at 0.25 mm in the cylinder head specification table. Cylinder head bolt torque values are documented in a multi-stage sequence, with final-stage values specified at 18–20 kgm in the engine assembly data. The cooling system capacity is 52 liters for the 2009–2013 build series. Reference how factory workshop documentation is structured for more details on these data points.

Note: All service data shown here is for reference only — qualified technicians and the original OEM documentation remain the authoritative source for any hands-on work. An official 775-page Komatsu OEM shop manual covering the 1990–2005 WA400-1, documenting engine, chassis, electrical, and hydraulic specifications for the 10001 and up serial number range.

Manual FAQ, Purchase & Download Details

What main systems are detailed within the Komatsu WA400-1 technical shop manual? keyboard_arrow_down

Document covers the structure, function, and assembly of major machine groups including the engine, power train, steering, brakes, work equipment, and electrical systems.

Is there a reference available for oil and coolant quantities within the documentation? keyboard_arrow_down

General section contains a dedicated table of oil and coolant quantities for standard maintenance planning. This reference supports the identification of system capacities without providing procedural instructions.

Are there standard tightening torque charts provided for various bolt and nut sizes? keyboard_arrow_down

Manual includes comprehensive tables that list standard tightening torques for bolts and nuts based on thread diameter and width across the flats. These charts provide the necessary reference data for assembly activities.

Which section contains the exploded views and structure references for the wheel loader components? keyboard_arrow_down

Each major group chapter throughout the manual includes dedicated structure and function sections that provide clear diagrams and internal views of the assembly components.

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