The Hitachi Zaxis 250 K-3 is a robust excavator engineered for demanding construction and earthmoving applications. This tracked machine features a powerful diesel engine with approximately 7.1 liters of displacement, delivering around 125 kW (168 HP) of power. Its hydrostatic drive system ensures efficient power transfer, while its substantial operating weight of approximately 24,000-26,000 kg provides stability for heavy-duty tasks. With a digging depth of up to 6.6 meters and a reach of 10.0 meters at ground level, the Zaxis 250 K-3 is designed for productivity and reliability in challenging environments. This Workshop Service Repair Manual provides comprehensive guidance for mechanical technicians. It covers essential maintenance procedures, including fluid capacities for engine oil, hydraulic oil, coolant, and fuel, alongside detailed technical specifications for the engine, hydraulics, and dimensions. The manual also includes information on troubleshooting and repair, enabling users to effectively maintain the Zaxis 250 K-3 and ensure its optimal performance and longevity. Its purpose is to serve as a definitive resource for all service and repair-related inquiries.