This manual provides comprehensive service and repair information for the HITACHI HYDRAULIC EXCAVATOR ZAXIS ZX 120. Engineered for reliability and performance, this excavator is designed for demanding work environments. Its robust construction and advanced hydraulic systems ensure efficient operation across a variety of applications. This guide is intended to support the continued optimal functioning of your ZAXIS ZX 120. The scope of this manual covers all essential aspects of maintenance and repair for the HITACHI HYDRAULIC EXCAVATOR ZAXIS ZX 120. It includes detailed procedures for the general systems, fuel system, chassis, cooling system, engine top end, engine lubrication, drive, transmission, wheels/tires, final drive, brakes, suspension, steering, frame, and electrical system, complete with wiring diagrams. This resource is designed to assist owners, mechanics, and technicians in performing routine maintenance, troubleshooting issues, and executing complex repairs, ensuring the longevity and operational integrity of the equipment.