The Hitachi ZX225US-3 is a versatile excavator from the ZX-3 generation, engineered for demanding construction and earthmoving applications. This robust machine features a powerful Isuzu AA-6HK1XQA diesel engine, delivering 123 kW (165 hp) and adhering to EPA Tier 3 / EU Stage IIIA emissions standards. Its hydrostatic drive system with variable displacement hydraulic motors ensures efficient power transfer and precise maneuverability. With an operating weight of 23,200 kg and a maximum digging depth of 6.63 meters, the ZX225US-3 is built for reliability and performance in a wide range of operational environments. This Service Repair Workshop Manual in English provides comprehensive instructions for the full service and repair of the Hitachi ZX225US-3 excavator. It covers essential maintenance procedures, detailed troubleshooting guides, critical technical specifications, and vital safety information. This manual is an indispensable resource for owners, mechanics, and technicians, enabling them to effectively maintain, diagnose, and repair the equipment, ensuring its optimal performance and longevity.