This service manual covers the David Brown CAD4 30 engine, designed for robust performance and reliability. It provides comprehensive information for owners and service professionals alike, detailing the engineering and operational characteristics that define this engine. The manual is intended to be the definitive resource for understanding and maintaining the CAD4 30 engine throughout its service life. The scope of this manual encompasses all essential aspects of engine maintenance and repair. It includes detailed procedures for servicing, troubleshooting common issues, and accessing critical technical specifications. By following the guidelines and instructions within these pages, users can ensure optimal performance, longevity, and safety of their David Brown CAD4 30 engine, facilitating efficient and effective upkeep.