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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Document Details

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Document Number / Seller:
27592 / Sandra Sanchez
File Size:
31.85 MB
File Type:
PDF
Language:
English
Pages:
583
Printable:
Yes
Category:
Excavator
Last updated / verified
Dec 31, 2025

Models Covered & Key Technical Specifications

Komatsu PC78MR-6 Excavator Service Manual: Komatsu PC78MR-6 Excavator & S4D95LE-3-A Engine - Official Service & Repair Guide 2004 Edition Knowledge-Base

Certified Diagnostic Portfolio Manual | Series

  • Published Print Rate: 2.8/4.2 km/h establishes the standard travel speed Configurations.
  • Measured Dimensional Limits: For optimal operation, 6,200 mm defines the overall length Framework.
  • Integral Print Rate: 10.0 rpm -- signifies the continuous swing speed Threshold.
  • Operational Dimensional Limits: The boom has 2,730 mm of overall height Logic.
  • Fundamental Print Rate: The track frame requires 2,840 mm for standard operation Parameters.
  • Universal Dimensional Limits: Minimum ground clearance reaches 360 mm Standards.

Professional Workshop Service Manual & Technical Specifications

Komatsu PC78MR-6 Excavator Service Manual: Komatsu PC78MR-6 Excavator & S4D95LE-3-A Engine - Official Service & Repair Guide 2004 Edition Knowledge-Base

Validation-Data: Komatsu PC78MR-6 Excavator & S4D95LE-3-A Engine // Repair-Classification: Excavator / Hydraulic System Logic // Serial-Range: 1001 and up

Performance-Element Rating Framework
Machine Weight (with blade) 8,270 kg Steel shoe spec.
Bucket Capacity 0.28 m³ Road liner spec.
Engine Model KOMATSU S4D95LE-3-A Diesel engine Standard
Rated Engine Output 40.5 {54.0}/1,850 kW {HP}/rpm Architecture
Overall Length (A) 6,200 mm Norms
Overall Height (B) 2,730 mm Bounds

Coverage is segmented into:

  • GENERAL
  • STRUCTURE AND FUNCTION, MAINTENANCE STANDARD
  • TESTING AND ADJUSTING
  • DISASSEMBLY AND ASSEMBLY
  • OTHERS

Removal procedures are documented for: Removal procedures for the entire machine, including engine, hydraulic system, and undercarriage components. Technical specifications are provided for: Key operational parameters, including weights, dimensions, capacities, and performance metrics for the Komatsu PC78MR-6. Factory specifications are documented for: Detailed specifications for all major components, including engine output, hydraulic system pressures, and dimensional data. Engine rebuild procedures are documented for: Comprehensive engine overhaul instructions, covering disassembly, assembly, and testing for the S4D95LE-3-A engine. Drivetrain specifications are addressed in: Information on the track frame, idlers, rollers, sprockets, and track shoes, including maintenance standards and wear limits. This manual documents torque specifications for the track frame bolts to ensure proper structural integrity prevention.

FAQ

What is the **required** hydraulic oil capacity for the Komatsu PC78MR-6? keyboard_arrow_down

120 L is the specified capacity for the hydraulic system, with a refill capacity of 64 L.

Calculate the **specified** component clearances for the Komatsu PC78MR-6 swing motor. keyboard_arrow_down

For check valve springs, the installed load for A is 0.9 N {0.09 kg} and for B it is 1.8 N {0.18 kg}.

What values are **essential** for adjusting the Komatsu PC78MR-6 engine? keyboard_arrow_down

Engine speed is fixed to the speed set with the fuel control dial (11), with the controller setting the engine speed to low idling if the one-touch deceleration switch (16) is pressed.

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Reviews (4)

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I received the download link almost instantly after purchase. The customer service was very helpful when I had questions. Highly recommend!
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The manual is incredibly detailed and easy to follow. It made my maintenance tasks so much smoother!
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Rated 4 out of 5 stars
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This manual covers everything you need for the PC78MR-6. The diagrams are clear, and the troubleshooting section is a lifesaver!