This service repair manual covers the CNH NEF engine family, encompassing models F4CE, F4DE, F4GE, and F4HE. These engines are designed as Tier 3 compliant Common Rail Diesel engines, featuring a 6-cylinder configuration and a direct injection combustion system. The drive type is Mechanical and Electronic Drive Common Rail, highlighting advanced engineering for reliable performance. This manual is intended to provide comprehensive information for the maintenance and repair of these robust engines, which are built for demanding industrial applications. The purpose of this 546-page English-language manual is to serve as a complete guide for owners, mechanics, and technicians. It details general specifications, fuel systems, industrial applications, overhaul procedures, and technical specifications. Additionally, it includes essential information on tools, wiring diagrams, electrical and hydraulic diagrams, photo illustrations, and schemes. The manual offers extensive coverage of troubleshooting, diagnosing, servicing, and technical maintenance, ensuring that users can effectively manage and repair their CNH NEF engines.