The Yanmar YM155D is a robust diesel-powered machine designed for various operational needs. Engineered for reliability and efficiency, this model represents Yanmar's commitment to quality in its equipment. Its water-cooled system and glow plug start ignition ensure dependable performance in diverse conditions. The transmission features a constant mesh gearbox with 8 forward and 2 reverse gears, complemented by a dry type, single plate clutch for smooth operation. This service manual provides comprehensive guidance for the Yanmar YM155D. It covers essential maintenance procedures, detailed repair instructions, critical technical specifications, and safety guidelines. The manual is structured to assist both professional technicians and DIY mechanics in effectively maintaining, troubleshooting, and repairing the vehicle, ensuring its longevity and optimal performance.