This manual covers the Komatsu PC1250-7 Hydraulic Excavator, a robust machine engineered for demanding operational environments. Powered by the Komatsu 6D170E-3 diesel engine, this excavator delivers exceptional performance with a net horsepower of 367 kW (492 HP) and peak torque of 2128 Nm. Its design emphasizes reliability and efficiency, featuring a hydrostatic transmission with lock-up and four-wheel drive for superior traction and control. With an operating weight of 113,310 kg, the PC1250-7 is built for heavy-duty tasks, offering substantial power and stability. The purpose of this comprehensive Shop Manual is to provide detailed information for the maintenance, repair, and servicing of the Komatsu PC1250-7 Hydraulic Excavator and its associated Komatsu 6D170E-3 engine. It includes essential technical specifications, step-by-step repair procedures, troubleshooting guides, and safety precautions. This manual is an indispensable resource for owners, operators, mechanics, and technicians, ensuring the optimal performance, longevity, and safe operation of the equipment. It also includes specific details on fluid capacities and engine oil change intervals.