The Hitachi Zaxis 225USR is a robust excavator from the Zaxis Series, engineered for demanding operational environments. This model features a powerful 123 kW (165 hp) diesel engine with a displacement of 6.69 L, typically the Isuzu AA-6BG1T, paired with a hydrostatic transmission offering variable speed control. Its substantial operating weight of approximately 22,800 kg and precise dimensions, including a track gauge of 2,390 mm and ground clearance of 450 mm, contribute to its stability and performance. The Zaxis 225USR is designed for reliability and efficiency in construction and heavy-duty applications. This Workshop Service Repair Manual in English provides comprehensive guidance for the Hitachi Zaxis 225USR. It covers essential maintenance procedures, including engine oil change intervals of 500 hours and hydraulic oil change intervals of 2000 hours, along with fluid capacities for engine oil (21.5 L), hydraulic tank (135 L), and coolant (20 L). The manual details technical specifications for the hydraulic system, such as a max flow rate of 2 x 217.5 L/min and relief pressure of 31.9 MPa, as well as performance metrics like a swing speed of 10.7 rpm and travel speeds up to 5.0 km/h. This resource is invaluable for owners, mechanics, and technicians to ensure optimal performance, longevity, and safe operation of the equipment.