This comprehensive Lawn-Boy D400 Service/Shop Repair Manual provides in-depth technical information for maintaining and repairing your lawn mower. With hundreds of pages and detailed illustrations, this manual guides you through every aspect of your machine, covering everything from basic oil changes to complex transmission repairs. The manual is designed to be user-friendly, with clear instructions and numerous diagrams to assist you in understanding each step. You will gain access to the same information used by factory-trained technicians, empowering you to diagnose and resolve any issue confidently.

The Lawn-Boy D400 is a classic, highly sought-after lawn mower that was manufactured by Lawn-Boy, a division of Outboard Marine Corporation (OMC), in the 1960s. Known for their robust construction and reliable performance, Lawn-Boy mowers were a popular choice for homeowners in the era. The D400, a powerful and versatile model, featured a 4-cycle, single-cylinder engine with a displacement of approximately 4.0 cubic inches. This engine provided substantial power for tackling even the toughest lawns, while still remaining relatively lightweight and easy to maneuver. The D400 was also equipped with a durable steel deck and a variety of cutting heights, catering to different grass types and preferences. These characteristics made the D400 a favorite amongst both seasoned lawn care enthusiasts and occasional users alike.

The 4301 1963 300000001-399999999 Lawn-Boy D400 Service/Shop Repair Manual is a vital resource for anyone looking to maintain or restore their D400 lawn mower. This comprehensive document provides detailed instructions and diagrams for troubleshooting, disassembling, repairing, and reassembling the mower. From engine maintenance and carburetor adjustments to blade sharpening and deck repairs, the manual covers a wide range of procedures. It includes crucial information on identifying components, understanding their function, and utilizing specialized tools. This manual serves as an invaluable guide for both experienced mechanics and those new to lawn mower repair, empowering users to keep their D400 running smoothly and efficiently for years to come. Owning a copy of this manual ensures that you can tackle any issue that may arise with your D400, ensuring its longevity and continued value.