This manual covers the Hitachi Zaxis 225USR-3 CLASS hydraulic excavators, including the Zaxis 225USR-3, Zaxis 225USRLC-3, Zaxis 225USRK-3, and Zaxis 225USRLCK-3 models from the 3rd Generation series. These robust machines are engineered for demanding construction and earthmoving applications, featuring a powerful diesel engine, a precise hydrostatic transmission, and a durable tracked drive system. Their design emphasizes reliability and operational efficiency, making them a trusted choice for various heavy-duty tasks. This comprehensive Service Repair Workshop Manual in English provides essential information for the maintenance and repair of your Hitachi hydraulic excavator. It details critical areas such as engine specifications, hydrostatic transmission operation, fluid capacities, and recommended service intervals. The manual includes diagnostic procedures, repair instructions, wiring schematics, technical specifications, and numerous diagrams and illustrations to assist owners, mechanics, and technicians in ensuring optimal performance and longevity of the equipment.