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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Komatsu Models Covered & Key Technical Specifications

Models: PC128US-2, PC138US-2, PC138USLC-2
Sub-models / Variants: STD (Standard), With Blade, OPT (Optional), North America Spec, KUK Spec, avance, GALEO
Build Years: 2004
Serial Numbers: PC128US-2 (5001–7730, 7731 and up), PC138US-2 (4501 and up), PC138USLC-2 (1001–1500, 1501 and up)
Technical Data:

  • Engine type: Komatsu S4D102E-1, SAA4D95LE-3-A
  • Bucket capacity: 0.36 m3–0.50 m3
  • Operating weight: 12,750 kg–14,370 kg
  • Travel speed (High/Low): 2.9–5.1 km/h
  • Swing speed: 11.0–12 rpm
  • Hydraulic tank capacity: 99 liters
Technical Specifications
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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

Komatsu Manual Features & Content Preview

Komatsu PC128US-2, PC138US-2, and PC138USLC-2 Excavator Shop Manual

  • Covers 2004 Komatsu PC128US-2, PC138US-2, and PC138USLC-2 excavators, detailing standard and blade-equipped configurations
  • Official Komatsu publication P/N SEBM018417, printed May 2004
  • Contains 1,028 pages of technical data including machine-specific dimensional drawings, hydraulic circuit diagrams, and lubrication specifications
  • Accessibility includes searchable text layer for rapid lookup of torque specs and component assembly procedures
  • Laid out for standard letter and A4 printing for convenient shop-floor reference
  • This official 2004 first-edition manual serves as the primary factory documentation for the PC128US-2 and PC138US-2 series, incorporating critical machine-specific diagnostic data for multiple serial-number breaks

Technical Documentation Scope

The Komatsu PC128US-2 service manual is organized into technical chapters covering machine systems. These sections provide functional descriptions, structural overviews, testing procedures, adjustment settings, and disassembly/assembly guidelines for major components. The content documents hydraulic pump operation, swing machinery, engine control parameters, and track frame configurations, ensuring technicians have precise reference material for the specified machine serial numbers.

Specification and Reference Data

This manual provides extensive technical data, including comprehensive torque tables for metric bolts, flared nuts, and split flange components. The hydraulic tank capacity for these models is 99 liters, with a 69-liter refilling volume. Standard hydraulic oil operating pressure is documented at 31.9 MPa. Detailed specifications regarding swing speed, track gauge, and bucket capacity for the PC128US-2 are listed for quick reference. For further insight into the structure of this documentation, see what an OEM service publication covers. This shop manual provides essential maintenance and repair data for the Komatsu PC128US-2, PC138US-2, and PC138USLC-2 excavators, covering machine diagnostics and structural specifications for various global market configurations.

Manual FAQ, Purchase & Download Details

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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