This service repair shop manual covers Case New Holland diesel engines for industrial equipment, specifically the 445/M2, 445T/M2, and 668T/M2 models. These engines are engineered for robust performance and reliability in demanding industrial applications. This manual provides comprehensive information to ensure the optimal operation and longevity of your Case New Holland diesel engine. The purpose of this manual is to provide detailed guidance for the maintenance, repair, and technical understanding of the specified Case New Holland diesel engines. It includes essential sections on general information, feed, duty-industrial equipment, overhaul procedures, technical specifications, equipment details, and an appendix. This resource is designed to assist owners, amateur mechanics, and professional technicians in performing routine and preventive maintenance, troubleshooting issues, and executing necessary repairs to prevent premature failure.