The Hitachi Zaxis 225 USR is a robust construction machine engineered for demanding tasks. Powered by a 6.37 L, 6-cylinder diesel engine producing 120 kW (161 hp) at 2000 rpm, it features Tier 3 / Stage IIIA emission control. Its hydrostatic transmission ensures smooth operation, while the substantial operating weight of 22,400 kg (49,384 lbs) and a track width of 600 mm with double grouser shoes provide excellent stability and traction on various job sites. With a maximum digging depth of 6,605 mm and a standard bucket capacity of 1.2 m³, this machine is designed for efficiency and reliability in excavation and material handling operations. This Workshop Service Repair Manual provides comprehensive guidance for the maintenance and repair of the Hitachi Zaxis 225 USR. It covers essential areas including detailed engine specifications, hydraulic system components, fluid capacities for engine oil, hydraulic oil, and coolant, as well as performance data related to travel speed and digging capabilities. The manual is intended to assist owners, technicians, and mechanics in understanding the machine's systems, performing routine servicing, and addressing potential issues to ensure optimal performance and longevity.