The Hitachi Zaxis 225US is a robust excavator engineered for demanding construction and earthmoving applications. This model, powered by a 6.5-liter Isuzu AA-6BG1T diesel engine producing approximately 160 HP and 575 Nm of torque, features a hydrostatic transmission for precise control and efficiency. With an operating weight of roughly 22,000 to 23,500 kg and impressive digging capabilities, including a maximum digging depth of up to 6.8 meters and a reach of over 10 meters, the Zaxis 225US is designed for productivity and reliability in challenging environments. Its construction emphasizes durability and performance, making it a valuable asset for various heavy-duty tasks. This Workshop Service Manual provides comprehensive guidance for the maintenance and repair of the Hitachi Zaxis 225US. It covers essential areas such as detailed repair procedures, technical specifications for all major components including the engine and transmission, and recommended service intervals for critical maintenance items like oil changes and filter replacements. The manual also includes information on lubrication capacities and filter types. This in-depth resource is intended for professional technicians and owners seeking to ensure the optimal performance, longevity, and safe operation of their equipment through accurate and thorough service practices.