This manual covers the David Brown CAD4-30 Diesel Engine, a robust and reliable power unit designed for demanding applications. Engineered for durability and consistent performance, this engine is built to withstand rigorous use. Its design prioritizes efficiency and longevity, making it a trusted choice for various industrial and agricultural needs. The purpose of this comprehensive service manual is to provide detailed information for the maintenance, repair, and servicing of the David Brown CAD4-30 Diesel Engine. It includes in-depth procedures, technical specifications, and troubleshooting guidance essential for ensuring optimal operation and longevity of the engine. This resource is intended for owners, technicians, and mechanics who require accurate and reliable information to effectively maintain and repair the unit.