This manual covers the NEW HOLLAND F4GE0484E, F4GE0684F, F4HE0684J, F4AE0684K, and F4AE0684L engines for CNH. These engines are engineered for robust performance and reliability, making them a trusted choice for various demanding applications. This service manual provides comprehensive information to ensure these engines operate at peak efficiency and longevity. The purpose of this manual is to serve as a definitive guide for the maintenance, service, and repair of your CNH engines. It contains detailed procedures, technical specifications, and troubleshooting guidance, written with clarity for both experienced technicians and individuals with basic mechanical knowledge. With step-by-step instructions and detailed diagrams, this manual empowers users to perform necessary tasks correctly and efficiently, minimizing downtime and ensuring optimal engine function.