The Hitachi Zaxis 225 USRK 3 is a robust excavator designed for demanding construction and industrial applications. This Dash 3 model, powered by a 6.5-liter Isuzu AA-6BG1T diesel engine, delivers 120 kW of net power and 668 Nm of maximum torque, ensuring efficient operation. Its hydrostatic transmission with a 2-speed travel motor provides excellent maneuverability on various terrains. With an operating weight of 23,700 kg and substantial dimensions, including an overall length of 9,890 mm and width of 2,990 mm, the Zaxis 225 USRK 3 is engineered for stability and performance in challenging environments. This Workshop Service Repair Manual provides comprehensive guidance for the Hitachi Zaxis 225 USRK 3, intended for mechanical technicians. It covers essential maintenance procedures, including fluid capacities and service intervals for engine oil and hydraulic filters, alongside detailed technical specifications. The manual also includes information on troubleshooting, system diagnostics, and repair techniques necessary to maintain the optimal performance and longevity of the equipment. Its purpose is to equip technicians with the knowledge required for effective service and repair.