The Hitachi Zaxis ZX210W-3 and ZX220W-3 wheeled excavators represent the 3 Series generation, designed for robust performance and reliability in demanding work environments. These machines feature advanced engineering, including a hydrostatic transmission for smooth operation and precise control, and joystick operation for boom swing and bucket functions. With operating weights of approximately 21,000 kg for the ZX210W-3 and 22,000 kg for the ZX220W-3, they are built to handle substantial workloads. Their diesel-powered systems are engineered for efficiency and power, making them versatile tools for various construction and industrial applications. This Factory Service Repair Manual provides comprehensive guidance for the Hitachi Zaxis ZX210W-3 and ZX220W-3 excavators. It covers essential maintenance procedures, including service intervals and fluid capacities, as well as detailed troubleshooting steps to address potential issues. The manual also includes technical specifications and safety guidelines crucial for the proper operation and upkeep of these machines. Its purpose is to serve as an authoritative resource for owners, mechanics, and technicians, ensuring the longevity and optimal performance of the equipment through accurate information and systematic repair processes.