This workshop service repair manual provides comprehensive information for the Komatsu PC128US-2, a versatile excavator designed for demanding work environments. Known for its robust engineering and reliability, this model features a hydrostatic drive train and a variable displacement piston pump for efficient hydraulic system operation. Its approximate operating weight of 12,900 kg makes it suitable for a wide range of construction and excavation tasks. This manual serves as an essential guide for maintaining and repairing the Komatsu PC128US-2. It covers critical areas including detailed maintenance procedures, troubleshooting diagnostics, technical specifications, and safety guidelines. Owners, mechanics, and technicians will find the English-language content invaluable for ensuring optimal performance and longevity of the equipment.