This document pertains to the Hitachi Zaxis ZX210W-3 wheeled excavator, a robust piece of equipment designed for demanding construction and excavation tasks. Engineered with a powerful Isuzu AA-6HK1XQS diesel engine, this model delivers 126 kW (169 HP) of net power and features a 7.8 L displacement, meeting EPA Tier 3 and EU Stage IIIA emissions standards. Its hydrostatic drive transmission with 2-speed variable gears and 4WD system ensures efficient power delivery and maneuverability across various job sites. With an operating weight of approximately 20,500 kg and impressive digging capabilities, including a maximum digging depth of 6.63 meters, the Zaxis ZX210W-3 is built for reliability and performance in professional applications. This Workshop Service Manual (WSM) provides comprehensive technical information for the Hitachi Zaxis ZX210W-3. It covers essential maintenance procedures, detailed troubleshooting guides, and critical technical specifications necessary for the upkeep and repair of the machine. The manual is intended for use by owners, mechanics, and technicians, offering step-by-step instructions and diagrams to ensure correct servicing and optimal operational efficiency. By consulting this English-language manual, users can effectively maintain the Zaxis-3 generation excavator, ensuring its longevity and peak performance throughout its service life.