The Hitachi Zaxis 250LCN-3 hydraulic excavator represents a robust and reliable machine engineered for demanding construction and earthmoving tasks. This model, part of the Zaxis-3 generation, is designed with a focus on operational efficiency and durability, featuring a water-cooled diesel engine with a common rail direct injection fuel system. Its substantial operating weight of 24900 kg and dimensions including an overall length of 9860 mm and width of 3000 mm, along with a track gauge of 2390 mm, indicate its capability for heavy-duty applications. This comprehensive service manual provides essential information for mechanics and technicians responsible for the maintenance and repair of the Hitachi Zaxis 250LCN-3. It covers critical aspects of the vehicle, including detailed specifications for its hydraulic transmission and undercarriage, as well as maintenance procedures for key components like the fuel filter. The manual serves as an authoritative resource to ensure the optimal performance, longevity, and safety of the excavator through proper servicing and troubleshooting.