This manual covers the Allis-Chalmers Model 210 and 220 Tractors, representing a lineage of durable and utilitarian machinery from a historically significant American manufacturer. These tractors, likely produced in the mid to late 20th century, are known for their robust construction and reliable performance in agricultural and utility applications. The engineering quality inherent in the Allis-Chalmers brand ensures these machines are capable workhorses, and this manual provides the essential knowledge to keep them operating at their peak. This comprehensive service repair manual is designed to empower owners and technicians alike. It details all aspects of maintenance and repair, including in-depth engine service, transmission overhauls, brake system repairs, and electrical system troubleshooting. With clear instructions, detailed diagrams, and diagnostic procedures, this manual serves as an indispensable resource for routine maintenance, periodic lubrication, and addressing common issues, ensuring the longevity and optimal functionality of your Allis-Chalmers Model 210 or 220 Tractor.