The Komatsu PC800-8 is a robust excavator from the 8 Series generation, engineered for demanding operational environments. This machine features a powerful Komatsu SAA6D140E-5 engine, delivering 357 horsepower and meeting Tier 3 / Stage IIIA emission standards. With an operating weight of 78,400 kg and a hydrostatic transmission, it offers impressive performance and maneuverability for heavy-duty excavation tasks. Its substantial dimensions, including a digging depth of 7345 mm and a reach of 11385 mm, make it suitable for large-scale construction and earthmoving projects. This Workshop Service Manual provides comprehensive guidance for the repair and service of the Komatsu PC800-8. It covers essential maintenance procedures, including fluid capacities and recommended service intervals for engine oil and hydraulic oil. Detailed technical specifications for the engine, hydraulics, and dimensions are included, alongside information on its working range and performance capabilities. This manual is an indispensable resource for owners, mechanics, and technicians to ensure the optimal performance, reliability, and longevity of the PC800-8 excavator.