This Service Repair Manual provides comprehensive information for the 110 Series Diesel Engine, covering models such as S6D110-1, WA350-1, SA6D110-1, D66S-1, W120-2, W120-3, EG150-3, and EG150S-3. These engines are known for their robust construction and reliable performance in various applications. The manual details the engineering quality inherent in the design, ensuring optimal operation and longevity for these powerful diesel units. This English-language manual is designed to be an indispensable resource for owners, mechanics, and technicians. It covers essential areas including general information, structure and function, testing and adjusting, disassembly and assembly, maintenance standards, and repair and replacement of parts. With detailed procedures, troubleshooting guides, and technical specifications, this manual facilitates efficient maintenance and repair, ensuring the 110 Series Diesel Engine remains in peak operating condition.