This workshop service manual covers the Komatsu PC12R-8 and PC15R-8 compact excavators, part of the R-8 Series, with serial numbers 10001 and up. These machines are engineered for reliable performance and efficiency in various construction and landscaping applications. Featuring a Komatsu 3D82AE-5 diesel engine with a displacement of 1627 cc and a gross power of 26.6 HP at 2400 RPM, they are equipped with a hydrostatic transmission and 4-wheel drive for robust maneuverability. Their compact design, with an operating weight between 1145-1215 kg, an overall width of 990 mm, and 220 mm of ground clearance, makes them ideal for tight job sites. This comprehensive manual provides essential information for maintaining and repairing your Komatsu excavator. It details critical maintenance procedures, including engine oil capacity of 4.3 L, coolant capacity of 2.9 L, hydraulic tank capacity of 14.5 L, and fuel tank capacity of 18 L, with a typical engine oil service interval of 250 hours. Coverage includes in-depth troubleshooting guides, technical specifications, and safety guidelines to ensure optimal operation and longevity. This resource is designed for owners, mechanics, and technicians to effectively service and preserve the integrity of their PC12R-8 and PC15R-8 machines.