The Hitachi ZAXIS ZX225USLC-3 is a robust crawler excavator designed for demanding construction and earthmoving applications. This LC-3 generation model features a powerful Isuzu AA-6BG1T diesel engine, delivering 120 kW (161 hp) with a displacement of 6.494 L. Its hydrostatic transmission with two-speed travel motors ensures efficient operation, while the water-cooled system maintains optimal performance. With an operating weight of 22,700 kg and impressive digging capabilities, including a maximum depth of 6,650 mm and a reach of 9,950 mm, the ZX225USLC-3 is engineered for reliability and productivity on any job site. This Service Repair Manual provides comprehensive guidance for the Hitachi ZAXIS ZX225USLC-3 crawler excavator. It covers essential maintenance procedures, including lubrication capacities and recommended service intervals for the engine oil, hydraulic filter, and air filter. Detailed technical specifications for the engine, transmission, and hydraulic systems are included, alongside performance data for digging and travel. This manual serves as an indispensable resource for owners, mechanics, and technicians, enabling them to effectively maintain, troubleshoot, and repair the equipment to ensure its longevity and optimal performance.