This operator manual covers the Hitachi Zaxis series excavators, including models 120, 160LC, 270LC, 330LC, and 370LC. These machines are engineered for robust performance in demanding construction and excavation environments. Featuring powerful diesel engines with hydrostatic transmissions, the Zaxis excavators offer reliable operation and efficient power delivery. Their design prioritizes durability and operator comfort, making them suitable for a wide range of heavy-duty applications where precision and strength are paramount. This manual provides comprehensive guidance for the operation and maintenance of your Hitachi Zaxis excavator. It details essential procedures for safe operation, routine maintenance schedules, fluid specifications, and troubleshooting common issues. By following the instructions and specifications outlined within, operators and technicians can ensure optimal performance, longevity, and safety of the equipment. The information contained herein is vital for proper upkeep and efficient service, helping to minimize downtime and maximize productivity.