The Hitachi ZX50U-3 hydraulic excavator, part of the U-3 Series, is engineered for robust performance and reliability in demanding work environments. Powered by a 3.3-liter Cummins A3.3-T diesel engine, it delivers 47.6 horsepower, offering efficient operation for various excavation tasks. Its hydrostatic transmission and tracked drive type ensure excellent maneuverability and stability on challenging terrain. With a substantial operating weight of approximately 11,200 lbs and impressive digging capabilities, including a maximum depth of 11 ft 8 in and a reach of 19 ft 3 in, this excavator is designed for productivity and durability. This comprehensive Service Repair Manual provides detailed information essential for maintaining and repairing the Hitachi ZX50U-3 hydraulic excavator. It covers critical areas such as engine specifications, transmission systems, lubrication requirements, and filter types, along with performance metrics and operational dimensions. The manual is intended to assist owners, mechanics, and technicians in understanding the machine's components, performing routine maintenance, and executing necessary repairs to ensure optimal performance and longevity. All procedures and specifications are presented in English for clarity and ease of use.