The Hitachi ZAXIS ZX70LCN-3 is a robust Crawler Excavator engineered for demanding construction and earthmoving applications. Featuring a powerful Isuzu AI-4JJ1X diesel engine with a displacement of 3.0 L, it delivers reliable performance with a gross power of 51.7 kW (69.3 hp). Its hydrostatic transmission ensures smooth operation and efficient travel at speeds up to 4.7 km/h. With an operating weight of 6960 kg and impressive digging capabilities, including a maximum digging depth of 4030 mm, this excavator is designed for productivity and durability in various work environments. This Service Repair Manual provides comprehensive guidance for the Hitachi ZAXIS ZX70LCN-3 Crawler Excavator. It covers essential maintenance procedures, detailed troubleshooting steps, and critical technical specifications, including engine details, hydraulic system information, and dimensional data. The manual is intended to assist owners, mechanics, and technicians in effectively maintaining, servicing, and repairing the equipment, ensuring its optimal performance and longevity. All information is presented in English for clarity and ease of use.