This service manual covers the Hitachi ZX 250H-3, a robust excavator from the H-3 Series, powered by an Isuzu AH-6HK1X diesel engine. Engineered for demanding applications, this machine boasts a powerful 7.8-liter engine producing 157 kW (211 hp) and 804 Nm (593 lb-ft) of torque, meeting Tier 3 / Stage IIIA emission standards. Its hydrostatic transmission and substantial operating weight of 24,700 kg (54,450 lbs) ensure reliable performance and stability. With impressive digging capabilities, including a maximum depth of 6.65 meters and a reach of 9.91 meters, the ZX 250H-3 is designed for efficiency and durability in various construction and earthmoving tasks. This comprehensive English-language workshop repair manual provides essential information for the maintenance and repair of the Hitachi ZX 250H-3. It details critical procedures, technical specifications, and troubleshooting guidance for owners, mechanics, and technicians. Key areas covered include engine and hydraulic system maintenance, lubrication requirements, filter replacement schedules, and performance data. With 699 pages of detailed instructions, this manual is an indispensable resource for ensuring the longevity and optimal performance of your equipment.