This workshop service repair manual provides comprehensive information for the Komatsu PC800LC-8 excavator, a powerful machine designed for heavy-duty earthmoving and construction applications. Built with Komatsu's renowned engineering quality and reliability, this model features a robust Komatsu SAA6D170E-5 Diesel Engine, delivering 370 kW (496 HP) and meeting Tier 3 / Stage IIIA emission standards. Its hydrostatic transmission with electronic control, substantial operating weight of approximately 77,830 kg, and impressive digging depth of up to 7,505 mm make it a versatile and efficient tool for demanding job sites. This manual serves as an essential resource for owners, operators, and service technicians. It details critical maintenance procedures, including engine oil change intervals and fluid capacities for the hydraulic, fuel, and coolant systems. The document also covers troubleshooting guidance, technical specifications, and safety precautions necessary for the proper operation and upkeep of the PC800LC-8. By following the instructions within this English-language manual, users can ensure optimal performance, longevity, and safety of their equipment.