This service manual covers the David Brown CAD4-30 Diesel Engine, designed for robust performance and reliability in demanding applications. Engineered with precision, the CAD4-30 is a testament to David Brown's commitment to quality, offering dependable power and efficiency. Its robust construction and advanced diesel technology make it a preferred choice for various industrial and agricultural needs, ensuring consistent operation and longevity. This comprehensive manual is meticulously prepared to assist professional technicians in maintaining and repairing the David Brown CAD4-30 Diesel Engine. It details essential service procedures, troubleshooting guides, technical specifications, and critical safety information. By providing in-depth knowledge and step-by-step instructions, this resource empowers technicians to perform accurate diagnostics and effective repairs, ensuring the engine operates at its optimal performance and extends its service life.