The Allis-Chalmers Model RC Tractor, produced during the 1930s and 1940s, represents a significant piece of agricultural machinery from its era. Known for its robust construction and reliable performance, this 4-cylinder, water-cooled gasoline tractor, with an approximate displacement of 165 cubic inches, was designed for versatility and sustained pulling power. Its engineering quality is reflected in its durable components, including a sliding gear transmission with typically four forward and one reverse speed, a standard Power Take-Off (PTO) unit, and a dry single plate clutch. The Model RC was a workhorse, embodying the innovation and utility that defined the Allis-Chalmers Manufacturing Company's contribution to the agricultural sector. This Workshop Service Manual (WSM) provides comprehensive guidance for the repair and maintenance of the Allis-Chalmers Model RC Tractor. It covers all essential systems, including detailed procedures for engine overhaul, transmission service, chassis and suspension repairs, brake adjustments, and electrical system troubleshooting. The manual also addresses hydraulic systems and operator controls, offering step-by-step instructions, diagnostic guides for common issues, and essential technical specifications. With its detailed illustrations and diagrams, this manual is an indispensable resource for owners and technicians seeking to maintain, repair, and preserve the functionality and longevity of their Model RC Tractor.