This Service Repair Workshop Manual provides comprehensive information for the Hitachi Zaxis 225US-3 and 225USLC-3 excavators. These machines are engineered for demanding construction and earthmoving applications, built upon Hitachi's reputation for robust design and operational reliability. The Zaxis series is known for its advanced hydraulic systems and efficient power delivery, making it a capable choice for a wide range of site conditions and tasks. This manual serves as an essential resource for maintaining and repairing your Hitachi excavator. It details general information, safety precautions, and specific procedures for all major components, including the upperstructure, undercarriage, and front attachment. You will find guidance on engine and accessory servicing, troubleshooting common issues with diagnostic charts and wiring schematics, and essential technical specifications such as tightening torques and fluid capacities. Regular reference to this manual will ensure optimal performance and longevity of your equipment.