This manual covers the Hino H07D Engine, a 7.4L 6-cylinder inline, 4-cycle, overhead valve, water-cooled engine. Designed for reliability and performance, the H07D engine is a robust component known for its engineering quality. This comprehensive service manual provides in-depth information to ensure optimal operation and longevity of this engine. The purpose of this manual is to serve as the definitive resource for maintenance, repair, and troubleshooting of the Hino H07D Engine. It includes detailed procedures for engine overhaul, lubrication systems, fuel and cooling systems, as well as electrical circuits and components. With step-by-step instructions, detailed illustrations, and diagnostic guides, this manual empowers both experienced technicians and do-it-yourself owners to effectively maintain and repair their engine.