The Hitachi Zaxis 225USR, part of the Zaxis Series, represents a robust and reliable piece of heavy machinery engineered for demanding work environments. This excavator is designed with precision and efficiency in mind, featuring a powerful Hino J05E-TM diesel engine that delivers 122 kW of net power and 628 Nm of maximum torque. Its hydrostatic swing and travel system, combined with a compact tail swing radius of 1.70 meters, make it exceptionally maneuverable in confined spaces. With an operating weight of 22,500 kg and a standard bucket capacity of 1.0 m³, the Zaxis 225USR is built for performance and durability in various construction and excavation applications. This Workshop Service Manual provides comprehensive guidance for the repair and maintenance of the Hitachi Zaxis 225USR. It covers essential technical specifications, detailed maintenance procedures, and troubleshooting information to ensure optimal performance and longevity of the equipment. Within these pages, owners, mechanics, and technicians will find critical data on engine, transmission, hydraulic systems, and undercarriage components. The manual is presented in English and is designed to be an indispensable resource for anyone responsible for the upkeep and repair of this advanced excavator.