The Hitachi ZX250K-3 is a robust Hydraulic Excavator engineered for demanding work environments. Powered by an Isuzu AH-4HK1X engine, it delivers a gross power of 177 horsepower (132 kW) from its 5.2-liter displacement, meeting Tier 3 / Stage III A emission standards. This model is designed for efficiency and reliability, featuring a main pump flow of 251 liters per minute and a maximum operating weight of 24,800 kg (54,670 lbs). Its operating performance includes a swing speed of 11.4 rpm and travel speeds up to 5.5 kph, making it a versatile machine for various construction and excavation tasks. This comprehensive Workshop Service Manual provides detailed guidance for the repair and maintenance of the Hitachi ZX250K-3 Hydraulic Excavator. It covers essential procedures, technical specifications, and troubleshooting information necessary for optimal performance and longevity. The manual is structured to assist owners, mechanics, and technicians in understanding the machine's systems, including engine, hydraulics, and undercarriage. Key maintenance intervals for engine oil, hydraulic oil filters, and fuel filters are outlined, ensuring proper upkeep and minimizing downtime.