This Service Repair Manual covers the CNH NEF F4 engine family, a series of 4-cylinder, turbocharged diesel engines designed for robust performance and reliability. Available in variants such as F4CE, F4DE, F4GE, and F4HE, these engines are engineered to meet Tier 3 emission standards and feature a liquid-cooled system with Common Rail Direct Injection for efficient fuel delivery. With a displacement of approximately 4.5 liters, the NEF F4 series is built for demanding applications where power output and torque are critical. This comprehensive manual provides essential information for the maintenance, repair, and troubleshooting of the CNH NEF F4 engines. It includes detailed procedures for scheduled maintenance, filter replacements, and lubrication, along with diagnostic steps for common issues such as starting problems and power loss. The manual is designed for users ranging from beginners to experienced mechanics, offering step-by-step instructions, high-quality diagrams, exploded views, and manufacturer specifications to ensure proper upkeep and effective repairs.