This manual covers the CASE CX330 and CX350 Crawler Excavator. These machines are engineered for robust performance in demanding construction and excavation environments. Their design prioritizes reliability and efficiency, featuring a diesel engine with a common rail direct injection fuel system and a liquid-cooled system, coupled with a hydrostatic transmission offering two travel speed ranges. The crawler design provides stability and traction across varied terrain, making these excavators versatile tools for a wide array of heavy-duty applications. This comprehensive service manual provides essential information for the maintenance, repair, and operation of the CASE CX330 and CX350 Crawler Excavator. It details critical procedures, technical specifications, and diagnostic information necessary for optimal performance and longevity. Owners, operators, and technicians will find guidance on routine servicing, troubleshooting common issues, understanding system functions, and adhering to safety protocols. The manual serves as an indispensable resource for ensuring the machine operates at peak efficiency and reliability throughout its service life.