The Komatsu PC450LC-6K hydraulic excavator, designed for demanding construction and earthmoving applications, represents a robust and reliable piece of heavy machinery. Featuring a powerful Komatsu SAA6D125E-2 direct injection, turbocharged, and aftercooled diesel engine, it delivers 235 kW (315 HP) of net power and substantial torque for efficient operation. Its hydrostatic, planetary gear transmission with multiple-disc clutch ensures smooth power delivery and variable travel speeds, while the overall dimensions, including a length with bucket of 10630 mm and width over tracks of 3350 mm, are optimized for stability and performance on challenging job sites. This model, identified by serial numbers K30001 and up, is engineered for durability and productivity. This comprehensive manual provides essential information for the operation, maintenance, and service of the Komatsu PC450LC-6K hydraulic excavator. It covers critical areas such as routine maintenance schedules, including engine oil and filter changes every 500 hours and hydraulic filter replacement every 1000 hours, as well as detailed procedures for various repair tasks. Technical specifications, fluid capacities for the engine and hydraulic systems, and performance data are included to assist owners, operators, and technicians. The manual's purpose is to ensure the longevity, optimal performance, and safe operation of the equipment through clear guidance and accurate technical data.