The Hitachi Zaxis ZX210W-3 and ZX220W-3 wheeled excavators represent robust engineering designed for demanding work environments. These machines, part of the Dash 3 generation, are built for reliability and performance, featuring diesel engines likely manufactured by Cummins. With gross power outputs of approximately 110 kW for the ZX210W-3 and 117 kW for the ZX220W-3, they are equipped to handle a variety of excavation and construction tasks. Their substantial operating weights, typically ranging from 20,000 to 23,000 kg, provide the stability and power needed for efficient operation. This Service Repair Manual provides comprehensive guidance for maintaining and repairing the Hitachi Zaxis ZX210W-3 and ZX220W-3 models. It covers essential areas including detailed maintenance procedures, troubleshooting common issues, and technical specifications necessary for optimal performance. The manual is intended for owners, mechanics, and technicians, offering the information required to ensure the longevity and operational efficiency of these powerful wheeled excavators. Its content is presented in English to facilitate understanding and application across a broad user base.