The Hitachi Zaxis 225USR-3 Hydraulic Excavator, part of the USR-3 Series, represents a robust and reliable machine engineered for demanding construction and excavation tasks. Its design emphasizes operational efficiency and durability, making it a valuable asset for a wide range of professional applications. The excavator is powered by an Isuzu AI-4HK1X turbocharged diesel engine, displacing 5.2 liters, which delivers approximately 110 kW (148 hp) of gross power. With a hydrostatic, all-wheel-drive tracked system and an operating weight ranging from 21,500 to 23,400 kg, this model is built to perform in challenging environments. This comprehensive Full Service Repair Manual in English provides detailed guidance for the maintenance and repair of the Hitachi Zaxis 225USR-3. It covers essential procedures, technical specifications, and troubleshooting information necessary for optimal performance and longevity. Owners, mechanics, and technicians will find the information within this manual invaluable for performing routine maintenance, such as engine oil and hydraulic filter changes at recommended intervals, as well as addressing more complex repair needs. The manual aims to ensure the continued reliability and efficiency of the excavator throughout its operational life.