This Service Repair Manual covers the CNH Engines NEF F4CE, F4DE, F4GE, and F4HE series engines, specifically models F4CE9484, F4DE9484, F4GE9484, and F4HE9484, designed for industrial applications. These 4-cylinder diesel engines feature a Common Rail injection system and a Mechanical and Electronic Drive control system, adhering to Tier 3 emission standards. CNH Engines are recognized for their robust engineering and reliability, making them a dependable choice for demanding industrial operations. This comprehensive manual provides essential information for the maintenance and repair of your CNH NEF engine. It includes detailed sections on general specifications, fuel system information, duty industrial application details, overhaul technical specifications, and required tools. Furthermore, the manual offers engine technical cards, safety prescriptions, diagnostic procedures, troubleshooting guides, and clear illustrations and diagrams, including electrical and hydraulic schematics, to assist owners, mechanics, and technicians in ensuring optimal engine performance and longevity.