This manual covers the HITACHI ZAXIS 330-3, 350H-3, and 350LCH-3 excavators. These machines are engineered for robust performance and reliability in demanding construction environments. Their design prioritizes operational efficiency and durability, making them suitable for a wide range of heavy-duty applications. The focus on quality construction ensures consistent performance and longevity, reflecting HITACHI's commitment to excellence in heavy equipment manufacturing. The purpose of this service repair manual is to provide comprehensive guidance for the maintenance and repair of these HITACHI excavator models. It includes detailed procedures, technical specifications, and troubleshooting information essential for technicians and mechanics. By following the instructions within this manual, owners and service professionals can effectively maintain the operational integrity and extend the service life of their equipment, ensuring optimal performance and safety.