This Service Repair Workshop Manual provides comprehensive information for the Hitachi Zaxis 225USRLCK-3 excavator, part of the Generation 3 series. Engineered for demanding construction and industrial applications, this excavator is known for its robust design and reliable performance. Its compact radius configuration makes it ideal for operation in confined spaces, while its powerful diesel engine, likely a Cummins with approximately 6.7 liters displacement and around 160-170 HP, ensures efficient operation. The hydrostatic transmission with dual hydraulic motors provides precise control and power delivery, contributing to its overall operational excellence and suitability for a wide range of earthmoving tasks. This manual serves as an essential resource for owners, technicians, and mechanics. It details all aspects of maintenance, repair, and technical specifications necessary to keep the Hitachi Zaxis 225USRLCK-3 in optimal working condition. Coverage includes routine maintenance schedules, fluid capacities, filter replacement intervals, and detailed procedures for various systems, such as the engine and hydrostatic transmission. Furthermore, it provides critical data on digging performance, dimensions, and undercarriage specifications, empowering users with the knowledge to perform accurate diagnostics, troubleshooting, and repairs, thereby ensuring the longevity and efficiency of the equipment.