The Komatsu PC128US-2, part of the US-2 Series, is a robust excavator engineered for demanding work environments. Featuring a powerful Komatsu S4D102E-1 diesel engine with a displacement of 3.9 L and an output of 97 HP, this machine is designed for reliability and efficiency. Its hydrostatic transmission ensures smooth operation, while its compact design, with an operating weight between 13000-13800 kg and 400 mm of ground clearance, allows for maneuverability in confined spaces. The fully enclosed cab with ROPS/FOPS certification provides operator safety and comfort, making the PC128US-2 a versatile tool for construction and earthmoving applications. This comprehensive Shop Manual & Operation & Maintenance Manual, presented in English, covers all essential aspects of the Komatsu PC128US-2. It details critical maintenance procedures, including fluid capacities for the engine, hydraulics, and coolant, alongside technical specifications for powertrain, dimensions, and performance metrics like digging depth and reach. Troubleshooting guidance and safety information are also included to assist owners, mechanics, and technicians in maintaining optimal performance and longevity of the equipment. This manual serves as an indispensable resource for understanding and servicing the PC128US-2.