The Komatsu PC300-7E0 and PC300LC-7E0 excavators represent robust engineering designed for demanding work environments. Powered by the Komatsu SAA6D114E-2 engine, a turbocharged, aftercooled, direct injection diesel unit, these machines deliver substantial net power of 204 kW (274 HP) at 2000 rpm. Their advanced hydrostatic, planetary power-shift transmission ensures efficient power delivery and maneuverability. With operating weights around 30,170 kg for the PC300-7E0 and 31,420 kg for the PC300LC-7E0, these excavators are built for stability and performance in a wide range of construction and earthmoving applications. This Full Service Repair Manual provides comprehensive information essential for the maintenance and repair of your Komatsu PC300-7E0 or PC300LC-7E0 excavator. It covers critical areas including detailed maintenance procedures, troubleshooting guides for common issues, precise technical specifications for all major systems, and vital safety guidelines. By utilizing the information contained within this manual, owners, mechanics, and technicians can effectively ensure the optimal performance, longevity, and safe operation of these powerful machines.