The Komatsu PC270LC-7L Hydraulic Excavator represents a robust and reliable machine engineered for demanding work environments. Featuring a powerful Komatsu S6D102E-1 diesel engine, this excavator delivers exceptional performance with a net horsepower of 133 HP at 2000 rpm, coupled with a hydrostatic, variable speed transmission for efficient power delivery. Its substantial operating weight of 27,500 kg and impressive digging capabilities, including a maximum digging depth of 6635 mm and a reach of 9935 mm, make it suitable for a wide range of construction and earthmoving applications. The 7L generation model is built with Komatsu's renowned engineering quality, ensuring durability and operational excellence. This Full Service Repair Manual provides comprehensive information essential for maintaining and repairing the Komatsu PC270LC-7L Hydraulic Excavator. It covers critical areas such as detailed engine specifications, hydraulic system diagnostics, transmission operation, and maintenance schedules, including fluid capacities and service intervals for engine oil and filters. The manual also outlines key performance metrics and dimensions, offering a complete technical reference. Its purpose is to empower owners, technicians, and mechanics with the knowledge required to ensure the optimal performance, longevity, and safety of the equipment through accurate repair and maintenance procedures.