This manual covers the Komatsu PC450-6 and PC450LC-6 excavators, part of the Generation 6 series. These robust machines are engineered for demanding construction and earthmoving applications, featuring a powerful Komatsu SAA6D125E-3 diesel engine with 11.04 L displacement and a net power output of 220 kW. With impressive digging depths of up to 7.14 meters and a substantial bucket capacity of 2.6 cubic meters, these excavators are built for efficiency and reliability in challenging environments. Their hydrostatic transmission ensures smooth and precise operation, making them a cornerstone of heavy-duty operations. This comprehensive Full Service Repair Manual in English provides essential information for the maintenance and repair of your Komatsu excavator. It details critical procedures, technical specifications, and troubleshooting guidance necessary to keep your PC450-6 or PC450LC-6 operating at peak performance. Covered topics include engine oil and hydraulic system servicing, filter change intervals, and performance capabilities. This manual is an indispensable resource for owners, technicians, and mechanics seeking to ensure the longevity and optimal functioning of their equipment.