The Hitachi Zaxis ZX210W-3 is a robust Hydraulic Excavator from the Zaxis-3 Series, engineered for demanding construction and industrial applications. This model features a powerful Isuzu AH-4HK1X engine, a direct injection, turbocharged, and intercooled diesel unit with a displacement of 5.2 L, delivering 110 kW (148 hp) of power. Its hydrostatic swing and travel system ensures precise maneuverability, while its substantial operating weight of 21,900 kg and impressive digging depth of 6,680 mm highlight its capability. The Zaxis ZX210W-3 is designed for reliability and efficient performance in a wide range of operational environments. This Workshop Service Repair Manual provides comprehensive technical information in English for the Hitachi Zaxis ZX210W-3. It covers essential maintenance procedures, detailed troubleshooting guides, critical technical specifications, and important safety guidelines. The manual is an indispensable resource for owners, mechanics, and technicians, offering the necessary knowledge to perform routine maintenance, diagnose issues, and execute repairs, thereby ensuring the longevity and optimal performance of the hydraulic excavator.