The Komatsu PC138US-2 is a robust excavator designed for demanding work environments. This US-2 Series machine is engineered for reliability and performance, featuring a powerful Komatsu SAA4D102E-2 diesel engine with a displacement of 4.5 L, delivering 70.8 kW (95 hp) of gross power. Its hydrostatic transmission allows for efficient operation with travel speeds up to 5.3 km/h. With an operating weight of 13840 kg and compact dimensions, including an overall width of 2590 mm and a ground clearance of 440 mm, it is well-suited for various construction and excavation tasks where precision and maneuverability are essential. This Full Service Repair Manual provides comprehensive guidance for maintaining and repairing the Komatsu PC138US-2. It covers critical aspects such as engine specifications, including oil and coolant capacities, hydraulic system performance, and detailed attachment specifications for digging operations. The manual includes essential information on troubleshooting, routine maintenance procedures, and technical data to ensure the longevity and optimal performance of your equipment. This resource is invaluable for owners, mechanics, and technicians seeking to perform accurate and efficient service.