The Hitachi Zaxis 210K-3 is a robust excavator from the K-3 Series, engineered for demanding construction and earthmoving applications. It features a powerful Cummins QSB6.7 diesel engine, delivering approximately 120 kW (161 hp) and compliant with Tier 3 / Stage IIIA emission standards. This model is equipped with hydrostatic swing and travel, two-speed travel motors, and a substantial operating weight of around 21,700 kg, making it a reliable and efficient machine for a wide range of heavy-duty tasks. Its robust construction and advanced hydraulic system, including main pumps with a flow rate of 2 x 234 L/min, ensure high performance and productivity. This Service Repair Workshop Manual provides comprehensive guidance for the Hitachi Zaxis 210K-3 excavator. It covers essential maintenance procedures, detailed troubleshooting steps, technical specifications, and critical safety information. The manual is designed to assist owners, mechanics, and technicians in performing routine maintenance, identifying and resolving issues, and ensuring the optimal performance and longevity of the equipment. With detailed information on engine, hydraulics, undercarriage, and lubrication capacities, this manual is an indispensable resource for maintaining the Zaxis 210K-3.