This manual covers the Hitachi Zaxis Series excavators, including models 200, 225USR, 225US, 230, and 270. These machines are engineered for robust performance and reliability in demanding construction and excavation environments. Featuring powerful diesel engines, hydrostatic transmissions, and durable steel tracks, the Zaxis series offers efficient operation and versatility. Specific configurations may include monoboom or two-piece boom options, with varying bucket capacities and track shoe widths to suit diverse project requirements. This service manual provides comprehensive information for professional technicians. It details essential maintenance procedures, including lubrication schedules and fluid capacities for the engine and hydraulic systems, along with filter replacement intervals. The manual also covers technical specifications, troubleshooting guidance, and repair procedures for the various components of the Hitachi Zaxis excavators. Its purpose is to ensure optimal performance, longevity, and safe operation of the equipment through accurate and detailed technical documentation.