The Komatsu PC128US-2 is a robust excavator designed for demanding construction and earthmoving applications. This model, part of the US-2 generation, features a powerful diesel engine and a hydrostatic drive system, ensuring efficient operation and precise control. Its compact design, with an overall width of approximately 2.5 meters and a track shoe width of 600 mm, allows for maneuverability in confined spaces, while its operating weight of around 12,700 kg and a maximum digging depth of approximately 5.5 meters demonstrate its considerable capability. The engineering quality and reliability of the Komatsu PC128US-2 make it a dependable choice for various professional tasks. This Full Service Repair Manual provides comprehensive information for the Komatsu PC128US-2. It covers essential maintenance procedures, including fluid capacities and service intervals for engine oil, hydraulic oil, and fuel. Detailed technical specifications for the engine, transmission, and dimensions are included, alongside performance data such as digging depth and reach. The manual is designed to assist owners, mechanics, and technicians in understanding, maintaining, and repairing the excavator, ensuring its optimal performance and longevity. This English language document is an invaluable resource for anyone working with this equipment.