This workshop manual covers Hitachi ZX110, ZX110M, ZX120, ZX130, ZX130LCN, ZX125US, ZX135US, and ZX135UR hydraulic excavators. These tracked diesel excavators are engineered for demanding construction, earthmoving, and excavation tasks in heavy-duty environments. Built with Hitachi's commitment to quality and reliability, these machines offer robust performance for a wide range of applications. This comprehensive 748-page technical manual provides essential information for the maintenance and repair of your Hitachi excavator. It details critical procedures, troubleshooting guides, technical specifications, and safety protocols. Owners, mechanics, and technicians will find the necessary guidance to ensure optimal performance, longevity, and safe operation of their equipment.