The Hitachi Zaxis 225USR is a robust excavator engineered for demanding work environments. Powered by an Isuzu AI-4HK1X diesel engine, it delivers 123 kW (165 hp) and features a 5.193 L displacement, meeting Tier 3 / EU Stage III emission standards. Its hydrostatic transmission with a two-speed travel system ensures efficient operation, while its substantial operating weight of 21,800 kg (48,061 lbs) and impressive digging capabilities, including a maximum digging depth of 6,610 mm (21 ft 8 in) and a reach of 9,830 mm (32 ft 3 in), make it suitable for a wide range of construction and earthmoving tasks. The machine's design prioritizes reliability and performance in challenging conditions. This Factory Service Repair Manual provides comprehensive guidance for the Hitachi Zaxis 225USR. It covers essential maintenance procedures, detailed troubleshooting steps, and critical technical specifications, including fluid capacities for engine oil, hydraulic oil, coolant, and fuel. Performance data related to hydraulics and travel speed is also included. This manual is an indispensable resource for owners, mechanics, and technicians, enabling them to effectively maintain, service, and repair the equipment, ensuring its optimal performance and longevity.