The Hitachi Zaxis ZX210W-3 and ZX220-3 hydraulic excavators represent robust engineering designed for demanding operational environments. These machines are built upon a foundation of reliability and advanced technology, featuring a powerful Isuzu AA-6HK1XQS-01 diesel engine that delivers substantial gross power and torque. With a hydrostatic transmission and 4-wheel drive, they offer efficient power delivery and maneuverability. The Zaxis series is engineered for optimal performance in various construction and excavation tasks, ensuring productivity and durability in the field. This Workshop Service Repair Manual provides comprehensive guidance for the Hitachi Zaxis ZX210W-3 and ZX220-3 hydraulic excavators. It covers essential maintenance procedures, detailed troubleshooting steps, critical technical specifications, and vital safety guidelines. The manual is an indispensable resource for owners, mechanics, and technicians, enabling them to effectively maintain, service, and repair these machines, ensuring their continued optimal performance and longevity.