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.
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
Model 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:
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Engine: Komatsu S4D102E-1, SAA4D95LE-3-A, or SAA4D95LE-3-E Diesel
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Rated Output: 64 kW {85.8 HP} at 2,200 rpm to 66.2 kW {88.7 HP} at 2,200 rpm
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Max. Digging Depth: 5,405 mm to 5,945 mm
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Max. Digging Radius: 8,230 mm to 8,720 mm
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Bucket Capacity: 0.36 m3 to 0.50 m3
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Travel Speed: 2.9/5.1 km/h or 3.2/5.1 km/h depending on configuration
Komatsu Manual Features & Content Preview
Technical Specifications: Komatsu PC128US-2, PC138US-2 & PC138USLC-2
- Covers the 2005–2007 Komatsu PC128US-2, PC138US-2, and PC138USLC-2 hydraulic excavators (standard and blade-equipped).
- Official Komatsu OEM publication (S/N SEBM018419, first edition Jan 2005) detailing the GALEO and Avance build configurations.
- 470 pages of technical assembly, structural analysis, and testing data.
- Instant download directly to your account immediately after checkout.
- Permanent access for future reference—no need to re-purchase.
- Laid out for standard letter and A4 printing with full-text search to locate any part number fast.
- Documents the exact engineering differences between 5001-series and 7731-plus serial number units for the PC128US-2.
Component and System Documentation
This shop manual organizes technical data by primary machine system, making it an essential reference for technicians diagnosing issues on the shop floor. It details the internal structure and function of the power train, swing machinery, and hydraulic system components. You will find the exact arrangement and operating principles for hydraulic pumps, control valves, travel motors, and swing motors. By providing specific judgment standards for parts, the text ensures you can consistently evaluate components across different variants without second-guessing. Since this manual is an instant download, you can pull up these critical specs on your tablet or laptop right at the machine. Please ensure you follow all standard workshop safety protocols when referencing these structural limits and system pressures during equipment inspection.
Technical Data Preview
Standard machine weight is 12,950 kg for the PC128US-2 standard spec. The maximum digging radius for this model is listed as 8,230 mm in the assembly drawings. Engine rated output hits 64 kW (85.8 HP) at 2,200 rpm for standard models. Essential fluid capacities, such as the 120-liter hydraulic system volume, are explicitly tabulated by model serial number. For reassembly, the guide lists exact torque values for flared nuts, split flange bolts, and O-ring boss joints. The understanding parts documentation for vintage Komatsu excavators allows for clear identification of variants like the KUK or North American specifications.
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