This manual pertains to the Hitachi ZAXIS ZX 120-3 Excavator, a robust piece of equipment designed for demanding construction and excavation tasks. While specific production years are not detailed, this manual covers the ZX 120-3 Series, emphasizing its engineering and reliability for professional use. The excavator is built to deliver consistent performance and durability in various operational environments, making it a trusted choice for heavy-duty applications. This comprehensive service manual provides all the necessary information for maintaining and repairing the Hitachi ZAXIS ZX 120-3 Excavator. It includes detailed step-by-step instructions, diagrams, illustrations, and wiring schematics for a wide range of procedures, from routine scheduled maintenance and fluid capacity checks to in-depth repairs of critical systems like the clutch, brakes, steering, hydraulics, and electrical components. The manual also features a complete parts list and information on accessories to enhance performance, ensuring that owners, mechanics, and technicians have the resources needed to keep the equipment operating at its peak efficiency.