This workshop service manual covers the David Brown CAD4 30 Engine. Designed for robust performance and reliability, this engine is engineered to meet demanding operational requirements. Its construction emphasizes durability and efficiency, making it a dependable choice for various applications where consistent power output is essential. This manual is intended for use by mechanical technicians and provides comprehensive guidance for the service and maintenance of the David Brown CAD4 30 Engine. It details essential procedures, technical specifications, and troubleshooting information necessary to ensure the engine operates at peak performance and longevity. Understanding and applying the information within this manual will facilitate effective maintenance and repair.