This manual covers the YANMAR YM155D, a versatile and robust piece of equipment engineered for demanding tasks. While specific production years are not detailed, the YM155D is recognized for its reliable diesel engine and manual transmission, designed to provide dependable performance across a range of applications. Its construction emphasizes durability and efficiency, making it a valuable asset for any operation requiring consistent power and functionality. The purpose of this workshop service manual is to provide comprehensive guidance for the maintenance, repair, and troubleshooting of the YANMAR YM155D. It includes detailed information on routine maintenance procedures, overhaul processes, diagnostic information, and essential wiring diagrams. This manual serves as an indispensable resource for owners, technicians, and mechanics, ensuring the longevity and optimal performance of the vehicle through accurate and thorough technical data.