The Hitachi Zaxis 225 USLC-3 is a robust excavator designed for demanding construction and earthmoving applications. This model, part of the Zaxis-3 generation, features a powerful diesel engine with a displacement of 6.69 L, delivering approximately 120 kW of power. Its hydrostatic transmission provides variable speed control across two travel ranges, enhancing maneuverability. With an operating weight of around 22,000 kg and impressive digging capabilities, including a maximum digging depth of up to 6.64 meters, the Zaxis 225 USLC-3 is engineered for efficiency and reliability in various work environments. This workshop service repair manual provides comprehensive guidance for the Hitachi Zaxis 225 USLC-3. It covers essential maintenance procedures, including fluid capacities and recommended service intervals for filters, as well as detailed technical specifications for the engine, transmission, and dimensions. The manual is intended for mechanical technicians and offers information crucial for proper operation, upkeep, and repair of the equipment. By following the procedures outlined within, users can ensure the optimal performance and longevity of their Hitachi excavator.