This Service Repair Manual provides comprehensive information for the Komatsu PC120-6 Dash-6. Engineered for robust performance and reliability, this excavator is designed for demanding construction and earthmoving applications. Its powerful Komatsu S6D102E-1 diesel engine, featuring a 5.88 L displacement and delivering 88 HP, is coupled with a hydrostatic, variable displacement pump and motor transmission for efficient power delivery. The machine's substantial operating weight of 11,800 kg, combined with its impressive digging depth of 4.5 m and a bucket capacity ranging from 0.45 to 0.60 m³, makes it a versatile and capable tool for a wide array of tasks. This manual serves as an essential resource for owners, operators, and technicians. It details critical maintenance procedures, including fluid capacities for engine oil, hydraulic tank, coolant, and fuel, along with troubleshooting guides to address potential issues. Technical specifications cover engine components, transmission systems, and physical dimensions, providing the necessary data for accurate diagnostics and repairs. Safety guidelines are also included to ensure proper and secure operation. By following the instructions within this English language manual, users can effectively maintain the Komatsu PC120-6 Dash-6, ensuring its longevity and optimal performance.