This service and repair manual covers the Yanmar 3TNV and 4TNV series diesel engines, commonly found in Hyundai mini excavators (5TON, -7 Series) and Hyundai skid steer loaders. These diesel engines are engineered for reliability and performance in demanding applications. This manual provides comprehensive information to ensure the proper maintenance and repair of these robust power units. The purpose of this workshop manual is to equip owners, mechanics, and technicians with the necessary knowledge for effective vehicle upkeep. It details essential maintenance schedules, step-by-step repair procedures, troubleshooting guides, and technical specifications. By following the instructions within this manual, users can maintain the optimal operational condition and longevity of their Yanmar diesel engines.