The Hitachi Zaxis 225US-3 Hydraulic Excavator is engineered for robust performance and reliability in demanding work environments. Featuring a powerful Isuzu AA-6HK1XQS-02 diesel engine, this machine delivers 120 kW (161 hp) and 727 Nm (536 lb-ft) of torque, supported by a hydraulic pilot control transmission and two-speed variable displacement travel motors. With an operating weight of 23,200 kg (51,147 lb) and impressive digging capabilities, including a maximum digging depth of 6,530 mm (21 ft 5 in) and a reach of 9,990 mm (32 ft 9 in), the Zaxis 225US-3 is designed for efficiency and productivity in various construction and excavation applications. This Factory Service Repair Manual, provided in English, is an essential resource for maintaining and repairing the Hitachi Zaxis 225US-3 Hydraulic Excavator. It comprehensively covers critical aspects of the machine, including detailed engine specifications, hydraulic system information, transmission operation, and maintenance procedures. Owners, technicians, and mechanics will find valuable information on lubrication capacities, service schedules, troubleshooting guides, and technical specifications, enabling them to ensure optimal performance, longevity, and safety of the equipment.