This manual covers the YANMAR BY Series machinery, designed for demanding service and repair applications. Engineered with robust diesel power, these units are built for reliability and performance in various operational environments. The focus on quality construction ensures durability and efficient operation, making the YANMAR BY Series a trusted choice for professionals requiring dependable machinery. This Factory Service Repair Manual provides comprehensive guidance for the maintenance and repair of your YANMAR BY Series machinery. It includes detailed procedures, technical specifications, and easy-to-read instructions, complemented by top-quality diagrams. Whether you are a do-it-yourself enthusiast or an experienced technician, this manual is an essential resource for ensuring your equipment remains in optimal working condition, covering everything from recommended service intervals to specific lubrication requirements.