2004 Komatsu PC78MR-6 Excavator Service Manual
Technical reference spanning specifications, operation, and maintenance for the Komatsu PC78MR-6 Excavator. Includes detailed diagrams and procedures for key systems like the engine, hydraulics, and undercarriage. Mfr P/N SEBM030602
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Komatsu Models Covered & Key Technical Specifications
Models: PC78MR-6
Sub-models / Variants: Steel shoe spec, Road liner spec, Rubber shoe
Build Years: 2004
Serial Numbers: 1001 and up
Technical Data:
- Engine: Komatsu S4D95LE-3-A, 4-cycle, water-cooled, in-line, direct injection
- Displacement: 3.26 L
- Rated output: 40.5 kW (54.0 HP) at 1,850 rpm
- Operating weight: 8,270–8,300 kg
- Travel speeds: 2.8 km/h (Low), 4.2 km/h (High)
- Swing speed: 10.0 rpm
- Hydraulic pump type: Variable-capacity piston pump × 1, Gear pump × 2
- Bucket capacity: 0.28 m³
Komatsu Manual Features & Content Preview
2004 Komatsu PC78MR-6 Excavator Technical Scope
- Covers 2004 Komatsu PC78MR-6 Excavator, including Steel shoe, Road liner, and Rubber shoe configurations
- Original OEM publication SEBM030602, printed in Japan, dated May 2004
- Contains 583 pages of technical specifications, maintenance standards, and hydraulic system diagrams
- Delivers searchable text layers for quick retrieval of torque specs, fluid capacities, and pressure thresholds
- Features comprehensive exploded-view diagrams of the hydraulic pump, travel motor, control valve, and swing machinery
- Accessible immediately upon purchase with no DRM restrictions for printing specific shop-floor sections
- Unlimited re-downloads tied to the purchase record for lifelong access
- This official edition documents the S4D95LE-3-A engine variant and associated control valve assemblies for serial numbers 1001 and up
Component and System Documentation
The Komatsu PC78MR-6 workshop manual details the structure and function of the hydraulic system, providing deep insights into the variable-capacity piston pumps and gear pumps. Detailed chapters cover the testing and adjusting of travel motors, swing machinery, and the multi-control valve, alongside maintenance standards for track frames, idlers, and rollers. The text provides guidance for mechanics on component assembly, with specific sections dedicated to the PPC lock solenoid valve, accumulator for brake, and various EPC valves used throughout the machine.
Specification and Reference Data
Technical data includes comprehensive torque tables for metric bolts, flared nuts, split flange bolts, and O-ring boss piping joints. Hydraulic specifications for the PC78MR-6 are listed at 26.5 MPa (270 kg/cm²) for work equipment and travel circuits, with swing and blade circuits set at 21.1 MPa (215 kg/cm²). The cooling system capacity is 10.5 liters, and the hydraulic tank capacity is specified at 120 liters. For more details on the structures, you can read how factory workshop documentation is structured.
Reference only — always consult a certified technician before performing service on this equipment. A complete 583-page Komatsu OEM workshop manual covering the 2004 PC78MR-6, documenting engine, hydraulic, electrical, and chassis specifications for the 1001-and-up serial number range.
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