This document provides comprehensive information for the Hitachi ZX50U-3 compact excavator. Engineered for demanding tasks, this machine features a robust Isuzu 3LD1 diesel engine, delivering 36.7 kW (49.2 hp) of net power. Its hydrostatic transmission ensures efficient operation with travel speeds up to 4.6 km/h, while its substantial operating weight of 4,800 kg and overall dimensions, including a length with bucket of 5,560 mm and an overall width of 1,980 mm, highlight its capability for various construction and landscaping applications. The ZX50U-3 is built with the quality and reliability expected from Hitachi, making it a dependable choice for professional use. This Factory Service Repair Manual in English offers extensive coverage designed to assist owners, mechanics, and technicians. It details essential maintenance procedures, including fluid capacities for the hydraulic system, engine oil, coolant, and fuel tank, along with service recommendations for engine oil changes, hydraulic filter replacement, and air filter cleaning. Furthermore, the manual covers technical specifications and troubleshooting guidance to ensure the optimal performance and longevity of your Hitachi ZX50U-3. The digital/printed format ensures accessibility for all users.