Komatsu PC128US-2, PC138US-2, PC138USLC-2 Hydraulic Excavator Shop Manual
Komatsu excavator troubleshooting and repair reference for PC128US-2, PC138US-2, PC138USLC-2 hydraulic excavators. Includes diagrams and specifications for safe and efficient operation.
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Sample pages from the Komatsu PC128US-2, PC138US-2, PC138USLC-2 Hydraulic Excavator Shop Manual manual
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Komatsu Models Covered & Key Technical Specifications
Models: PC128US-2, PC138US-2, PC138USLC-2, PC138USLC-2E0
Sub-models / Variants: Standard, With blade, North America Spec, KUK Spec, Long arm variant
Build Years: 2005–2007
Serial Numbers: PC128US-2 (5001–7730, 7731 and up), PC138US-2 (4501 and up), PC138USLC-2E0 (1001 and up), PC138USLC-2 (1001–1500, 1501 and up)
Technical Data:
- Engine: Komatsu S4D102E-1, SAA4D95LE-3-A, or SAA4D95LE-3-E Diesel
- Rated Output: 64 kW {85.8 HP} at 2,200 rpm to 66.2 kW {88.7 HP} at 2,200 rpm
- Max. Digging Depth: 5,405 mm to 5,945 mm
- Max. Digging Radius: 8,230 mm to 8,720 mm
- Bucket Capacity: 0.36 m3 to 0.50 m3
- Travel Speed: 2.9/5.1 km/h or 3.2/5.1 km/h depending on configuration
Komatsu Manual Features & Content Preview
Technical Scope and Data for Komatsu PC128US-2, PC138US-2, PC138USLC-2
- Covers the 2005–2007 Komatsu PC128US-2, PC138US-2, and PC138USLC-2 hydraulic excavators, including standard and blade-equipped configurations
- Official Komatsu publication S/N SEBM018419, first edition January 2005
- Contains 470 pages of technical assembly, structural analysis, and testing data
- Downloads to your account within seconds of checkout
- Permanent availability in your purchase account — no re-buy required
- Laid out for standard letter and A4 printing
- Full-text search finds any part number in seconds
- This manual documents the specific engineering differences between the 5001-series and the 7731-plus serial number units for the PC128US-2
Component and System Documentation
The 2005 Komatsu PC128US-2, PC138US-2, and PC138USLC-2 service manual organizes technical information by primary machine system. Chapters detail the internal structure and function of the power train, swing machinery, and hydraulic system components. The text covers the arrangement and operating principles of hydraulic pumps, control valves, travel motors, and swing motors, providing essential reference material for component inspection and assembly. Detailed sections provide judgment standards for parts, allowing for consistent technical evaluation across different machine variants.
Specification and Technical Reference
Technical Data Preview
Standard machine weight is documented at 12,950 kg for the PC128US-2 standard specification. The maximum digging radius for the PC128US-2 is listed as 8,230 mm in the assembly drawings. Engine rated output is documented at 64 kW {85.8 HP} at 2,200 rpm for standard models. Fluid capacities, such as the 120-liter hydraulic system volume, are explicitly tabulated by model serial number. Torque values for flared nuts, split flange bolts, and O-ring boss joints are provided for consistent assembly. The understanding parts documentation for vintage Komatsu excavators allows for clear identification of variants like the KUK or North American specifications.
An official 470-page Komatsu OEM shop manual covering the 2005–2007 PC128US-2, PC138US-2, and PC138USLC-2 series, documenting engine, chassis, hydraulic, and electrical specifications for the GALEO and Avance build configurations.
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