The Komatsu PC270LC-7L Hydraulic Excavator represents a robust and reliable machine engineered for demanding construction and earthmoving applications. Featuring a powerful Komatsu SAA6D107E-1 turbocharged, aftercooled, direct injection diesel engine, this excavator delivers exceptional performance with a net power output of 142 kW (190 HP). Its hydrostatic drive system and impressive digging capabilities, including a maximum digging depth of 6.72 meters and a bucket dig force of 198 kN, make it a versatile tool for various job sites. With a substantial operating weight ranging from 26,560 to 28,040 kg, the PC270LC-7L is built for stability and productivity. This Workshop Service Repair Manual provides comprehensive guidance for the Komatsu PC270LC-7L Hydraulic Excavator. It covers essential maintenance procedures, detailed troubleshooting steps, critical technical specifications, and vital safety guidelines to ensure optimal operation and longevity of the machine. This manual is an indispensable resource for owners, mechanics, and technicians, offering the necessary information to perform routine servicing, complex repairs, and in-depth diagnostics, thereby maximizing the efficiency and reliability of the excavator.