The Hitachi Zaxis 225USRK-3 is a robust excavator designed for demanding work environments. This model, part of the Dash 3 generation, features a powerful Isuzu AH-4HK1X diesel engine with a displacement of 5.2 liters, delivering substantial net power for efficient operation. Its hydrostatic transmission with a two-speed travel motor ensures precise control and maneuverability on various job sites. With an operating weight of approximately 22,200 kg and impressive digging capabilities, including a maximum digging depth of 6605 mm and a reach of 9950 mm, the Zaxis 225USRK-3 is engineered for reliability and performance in construction and excavation tasks. This comprehensive Workshop Service Manual provides essential information for maintaining and repairing the Hitachi Zaxis 225USRK-3. It covers critical areas such as detailed maintenance schedules, including fluid capacities and filter replacement intervals, along with technical specifications for the engine, transmission, and undercarriage. The manual also includes guidance on troubleshooting common issues and outlines safety procedures. Its purpose is to equip mechanics and technicians with the knowledge necessary to ensure the optimal performance, longevity, and safe operation of the equipment.