This service manual covers the Hitachi Zaxis 250H-3, a robust excavator from the 3 Series generation. Engineered for demanding construction and earthmoving tasks, this machine features a powerful Cummins QSB6.7 diesel engine producing 134 kW (180 HP) and a hydrostatic transmission with two-speed travel capabilities. Its substantial operating weight of 24,900 kg (54,900 lbs) and impressive digging depth of 6,640 mm (21 ft 9 in) underscore its capacity for heavy-duty operations. The Zaxis 250H-3 is designed for reliability and efficiency in challenging environments, offering a strong blend of power and precision. The purpose of this comprehensive English-language service manual is to provide detailed information for the maintenance, repair, and servicing of the Hitachi Zaxis 250H-3. It includes essential technical specifications, lubrication capacities, and performance data. Owners, mechanics, and technicians will find step-by-step procedures for various maintenance tasks and troubleshooting guidance. This manual is an indispensable resource for ensuring the optimal performance, longevity, and safety of the Zaxis 250H-3 excavator.