The Hitachi ZX40U-3 is a versatile compact excavator from the U-Series, engineered for demanding construction and landscaping tasks. This model features a robust diesel engine, providing efficient power for its operational weight of approximately 4030 kg. Its design prioritizes reliability and performance, with a hydraulic pilot control system and hydrostatic transmission offering precise maneuverability. The ZX40U-3 is well-suited for a variety of applications, from tight urban sites to broader excavation projects, thanks to its compact dimensions and impressive digging capabilities, including a depth of up to 3775 mm and a reach of 6030 mm. This Factory Service Repair Manual in English provides comprehensive guidance for the maintenance and repair of the Hitachi ZX40U-3. It covers essential areas such as detailed technical specifications, routine maintenance schedules including fluid capacities, troubleshooting common issues, and step-by-step repair procedures. The manual is an indispensable resource for owners, technicians, and mechanics, ensuring the longevity and optimal performance of the excavator through accurate information and best practices.