This manual covers Bolens tractors, specifically models S10, S12, and S14D, which are equipped with Wisconsin single-cylinder engines. These engines, known for their ruggedness and durability, powered a range of utilitarian and agricultural equipment. Bolens Manufacturing Company has a long history of producing reliable outdoor power equipment, and the S-series tractors represent a significant part of that heritage. This documentation serves as an essential resource for owners, enthusiasts, and mechanics dedicated to maintaining the functionality and longevity of these classic machines.

This comprehensive Service & Parts Manual provides detailed information for the maintenance, overhaul, and repair of the specified Bolens tractors and their Wisconsin engines. It includes coverage of critical engine systems such as fuel, ignition, lubrication, and cooling, along with detailed mechanical procedures for engine rebuilding. The manual also offers parts identification with exploded views and part numbers, as well as troubleshooting guidance for common issues. Its purpose is to equip users with the technical data and procedures necessary to ensure these vintage tractors remain operational and well-maintained.