The CNH NEF F4CE, F4DE, F4GE, and F4HE Tier 3 engines represent a line of robust 4-cylinder power units engineered for reliability and performance. These engines feature advanced fuel delivery systems, including a Mechanical Rotary Pump and Electronic Drive Common Rail with a CP3 High Pressure Pump, electro-injectors, and a fuel rail with a relief valve. They are equipped with an Exhaust Gas Re-circulation System (EGR) and offer naturally aspirated or inter-cooled air induction options, catering to diverse operational demands. The electronic control system utilizes EDC 7 operation, supported by a comprehensive array of sensors for engine oil, coolant temperature, fuel temperature, fuel pressure, and speed. This Complete Official Full Service Repair Manual in English provides essential information for the maintenance and repair of CNH NEF Tier 3 engines. It covers detailed procedures for routine maintenance tasks such as oil and fuel filter replacement, belt maintenance, and tappet adjustment, alongside daily checks. The manual includes a comprehensive troubleshooting section for both mechanical and electronic engine issues, supported by clear illustrations, drawings, photos, and detailed diagrams of circuits, equipment, and wiring. This resource is designed to assist owners, mechanics, and technicians in ensuring the optimal performance and longevity of their CNH engines.