This manual covers the HITACHI ZAXIS 330-3, 350LC-3, and 350LCN-3 excavator models. These excavators are engineered for robust performance and reliability in demanding construction environments. Their design prioritizes efficiency and durability, making them a trusted choice for heavy-duty excavation tasks. This service repair manual provides comprehensive details to ensure these machines operate at their peak potential. The purpose of this manual is to serve as a complete guide for the maintenance, repair, and technical understanding of the HITACHI ZAXIS series excavators. It includes detailed procedures, troubleshooting guidance, and essential technical specifications. By following the information within this manual, owners, mechanics, and technicians can effectively maintain the operational integrity and longevity of their equipment, ensuring safe and efficient operation.