The Hitachi Zaxis 250K-3 Hydraulic Excavator represents a significant advancement in heavy machinery, engineered for robust performance and reliability. This K-3 Series model, powered by a Cummins QSB6.7 diesel engine, is designed for demanding construction and excavation tasks. Its hydrostatic transmission, variable displacement piston pump hydraulic system, and a standard bucket capacity of 1.0 m³ contribute to its operational efficiency and power. With an operating weight of 23,900 kg and impressive dimensions, the Zaxis 250K-3 is built to tackle challenging job sites while maintaining stability and precision. This comprehensive Service Manual provides detailed information essential for the maintenance and repair of the Hitachi Zaxis 250K-3 Hydraulic Excavator. It covers a wide range of topics including engine specifications, transmission details, hydraulic system operation, and undercarriage components. Furthermore, the manual outlines crucial maintenance schedules, such as engine oil change intervals and filter replacement frequencies, alongside technical specifications and troubleshooting guidance. This resource is indispensable for owners, operators, and service technicians aiming to ensure the longevity and optimal performance of their equipment.