This manual provides comprehensive service and maintenance information for the David Brown AD4 25 CAD4 30 engine. It covers all models and engine types, offering detailed procedures and specifications designed to ensure the optimal performance and longevity of your equipment. The David Brown AD4 25 CAD4 30 engine is engineered for reliability and efficiency, and this manual serves as the definitive resource for its upkeep. The purpose of this workshop repair service manual is to equip owners, mechanics, and technicians with the knowledge necessary for effective maintenance, troubleshooting, and repair. It includes detailed instructions, diagrams, and technical specifications for various systems, including the engine body, fuel system, cooling system, and electrical system. By following the guidelines within this manual, users can confidently perform necessary service tasks, diagnose issues, and ensure the continued operational integrity of the David Brown AD4 25 CAD4 30 engine.