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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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.

Manual Description & Preview

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

Is there a reference provided for understanding the electrical wiring diagrams, wire color codes, and cable thickness specifications? keyboard_arrow_down

Manual includes an electric wire code section that lists cable specifications, including nominal numbers, current ratings, and color-coding conventions for circuits such as starting, lighting, and charging. These reference tables help decode the wiring diagrams used throughout the document.

Can I download this 1028-page PDF document immediately after completing my purchase? keyboard_arrow_down

Yes, this service manual is provided in a downloadable PDF format that allows for instant access upon purchase.

Does the manual include information regarding the hydraulic systems or general technical specifications for the PC128US-2 and PC138US-2 models? keyboard_arrow_down

Comprehensive manual contains chapters dedicated to structure and function, which reference hydraulic circuit diagrams and system components. It also provides maintenance standards and detailed tightening torque tables for various hardware, including O-ring boss piping joints and flared nuts. These sections are intended to provide technical information for operations performed in a service workshop.

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