Komatsu PC128US-2 / PC138US-2 / PC138USLC-2 Excavator Service Manual, Printable, 1028 Pgs, 134.60 MB, PDF

This comprehensive service manual covers the PC128US-2, PC138US-2, and PC138USLC-2 excavators, providing detailed diagnostics, maintenance, and repair procedures. Includes diagrams and specifications for all major systems.

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Komatsu Komatsu PC128US-2 / PC138US-2 / PC138USLC-2 Excavator Service Manual, Printable, 1028 Pgs, 134.60 MB, PDF manual page preview - page 1 of 1028

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Document Details

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Document Number / Seller:
27598 / Laura Peterson
File Size:
134.60 MB
File Type:
PDF
Language:
English
Pages:
1028
Printable:
Yes
Category:
Excavator
Last updated / verified
Feb 13, 2026

Models Covered & Key Technical Specifications

Komatsu PC128US-2 / PC138US-2 / PC138USLC-2 Excavator Service Manual - Diagnostics, Maintenance & Repair Procedures This comprehensive service manual covers the PC128US-2, PC138US-2, and PC138USLC-2 excavators, providing detailed diagnostics, maintenance, and repair procedures. Includes diagrams and specifications for all major systems. | Komatsu Excavator Repository

  • General Specifications: Machine weight of 12,950 kg (standard) for the PC128US-2.

Professional Workshop Service Manual & Technical Specifications

Komatsu PC128US-2 / PC138US-2 / PC138USLC-2 Excavator Service Manual: Diagnostics, Maintenance & Repair Procedures

Subsystem-Focus: Component identification and system operation logic // Reference-Category: Excavator Operation Manual / Hydraulic System Logic // Engineering-Metrics: Dimensional specifications and component ratings.

Systems This manual thoroughly documents the various systems within the Komatsu PC128US-2, PC138US-2, and PC138USLC-2 excavators. It details hydraulic components, the power train, engine systems, and electrical systems, ensuring comprehensive understanding.

Procedures The manual details essential procedures for maintenance and repair. It includes disassembly and assembly instructions, testing and adjusting methods, and calibration procedures for critical systems, ensuring proper machine upkeep.

Introduction to Specifications This section provides an overview of the manual's content, including a general assembly drawing, detailed specifications, and a weight table. It also lists lubricants and water requirements for various components.

Technical Specs Table Identifier Operational-Logic Logic
Machine weight Standard specification 12,950 kg
Bucket capacity Blade specification 0.45 m³
Engine type Komatsu S4D102E-1 Diesel engine
Engine rated output Standard specification 64 kW {85.8 HP}/2,200 rpm

TOC Summary Engineering chapters address:

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

Component and System Details The manual provides detailed explanations of various hydraulic components, including the hydraulic pump, control valve, and travel motor. It describes their functions and operational principles within the excavator's hydraulic system.

Torque Specifications This manual documents torque specifications for various fasteners and components, such as standard tightening torque for bolts and nuts, and torques for flared nuts, to ensure proper assembly and clamp load consistency.

FAQ

Identify the service interval parameters for the Komatsu PC128US-2? keyboard_arrow_down

11.0 rpm is the specified swing speed for Komatsu PC128US-2 serial numbers 6457 and up.

What procedures are documented for the system architecture? keyboard_arrow_down

The manual documents procedures for removing, installing, disassembling, and assembling each component, as well as precautions for them.

Determine the precise tool requirements for maintenance? keyboard_arrow_down

This shop manual recommends the use of tools specifically designed by Komatsu for specific purposes.

What specifications cover proper electrical values? keyboard_arrow_down

The "ELECTRIC WIRE CODE" section provides details on wire colors and symbols used in wiring diagrams.

Check the standard calibration settings for hydraulic systems? keyboard_arrow_down

Page 10-47 details the configuration of the CLSS, which consists of a variable displacement piston pump, a control valve, and actuators.

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Reviews (4)

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Had a question regarding the manual, and the support team responded in no time! Very helpful!
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This manual is incredibly detailed and has been a lifesaver for my maintenance routine. The instructions are clear and easy to follow!
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I was impressed with the thorough explanations in this manual. It made troubleshooting my excavator a breeze!
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Rated 5 out of 5 stars