The Komatsu PC12R-8 Hydraulic Excavator is a robust and reliable machine engineered for demanding work environments. Featuring a powerful Komatsu 3D67E-1C engine, this excavator delivers efficient performance with a rated output of 15.5 kW. Its compact design, with an overall width of 980 mm and an operating weight of 1260 kg, makes it suitable for a variety of applications where maneuverability is key. The hydrostatic transmission ensures smooth operation and precise control, while its digging capabilities, including a maximum digging depth of 2265 mm and a reach of 3740 mm, highlight its versatility in construction and landscaping projects. This Workshop Service Repair Manual provides comprehensive guidance for the Komatsu PC12R-8 Hydraulic Excavator. It covers essential maintenance procedures, detailed troubleshooting steps, and critical technical specifications necessary for optimal operation and longevity. Owners, mechanics, and technicians will find valuable information on engine service, hydraulic systems, and general upkeep. The manual is designed to facilitate efficient repairs and routine maintenance, ensuring the machine operates at peak performance and safety standards throughout its service life.