The Hitachi Zaxis 225US / 225USR is a robust excavator designed for demanding construction and industrial applications. Engineered with precision, these machines feature a powerful diesel engine with a displacement of approximately 5.1 to 7.2 liters, delivering an output of 120 to 150 kW. The hydrostatic transmission ensures smooth and efficient power delivery, complemented by variable displacement piston pumps in the hydraulic system. Notable features include a ROPS/FOPS certified cab for operator safety and a hydrostatic track drive for reliable maneuverability. With an operating weight ranging from approximately 21,000 to 23,000 kg, the Zaxis series is built for durability and performance in challenging environments. This comprehensive Workshop Repair Service Manual provides essential information for the maintenance, service, and troubleshooting of all Hitachi Zaxis 225US / 225USR models. Covering critical areas such as engine oil, hydraulic fluid, and coolant capacities and service intervals, this manual serves as an indispensable resource for owners, technicians, and mechanics. Detailed procedures and technical specifications are outlined to ensure optimal performance and longevity of the equipment. The manual is presented in English and is designed to facilitate efficient repairs and routine upkeep, empowering users to keep their Hitachi excavators operating at peak efficiency.