This manual covers the Komatsu PC800LC-8 excavator, a robust machine designed for demanding construction and earthmoving applications. Engineered for exceptional performance and reliability, the PC800LC-8 features a powerful Komatsu SAA6D140E-5 engine, delivering 397 net horsepower. Its substantial operating weight of 77,100 kg, combined with a hydrostatic transmission and a wide track gauge, ensures stability and traction in challenging environments. The machine's dimensions, including a length of over 11 meters with the bucket and a height of 3.5 meters to the cab, highlight its significant operational capacity. This comprehensive Full Service Repair Manual in English provides detailed information essential for the maintenance and repair of the Komatsu PC800LC-8. It covers critical areas such as engine specifications, transmission details, fluid capacities for various systems including engine oil, coolant, hydraulic oil, and fuel, as well as recommended service intervals for key components like the engine oil, air filter, and hydraulic filter. This manual is an indispensable resource for owners, operators, and service technicians seeking to ensure the optimal performance, longevity, and safety of their equipment.