This manual covers the Yanmar 4TNE98-HYF, an indirect injection diesel engine from the TNE series. Yanmar is recognized for its robust engineering and reliable performance, making its engines a trusted choice across various applications. This service repair manual provides comprehensive information designed to ensure the continued optimal operation of your Yanmar engine. The purpose of this English-language service repair manual is to guide owners, mechanics, and technicians through the maintenance and repair processes for the Yanmar 4TNE98-HYF. It includes detailed sections on general service information, periodic maintenance, engine systems such as fuel, cooling, and lubrication, as well as starter motor, alternator, and electric wiring. Furthermore, the manual offers troubleshooting guidance and covers Yanmar warranties, all presented with high-quality diagrams and instructions for easy understanding and application.