The Allis-Chalmers Model C tractor, produced from 1942 to 1952, represents a significant step in agricultural mechanization, designed for affordability and versatility on smaller farms. This robust machine, powered by an Allis-Chalmers Model E inline 4-cylinder gasoline engine, features a 4-speed forward and 1-reverse transmission, a dry single-plate clutch, and a rear 540 RPM Power Take-Off (PTO). Its engineering focused on practical utility, incorporating innovations like 'Power Crater' pistons for improved combustion. The Model C's solid construction and reliable performance made it a valuable asset for farmers during its era, contributing to its historical impact on farm efficiency. This comprehensive Workshop Service Manual (WSM) provides detailed information for the service, repair, and maintenance of the Allis-Chalmers Model C tractor. It covers all essential systems, including the engine, fuel, ignition, cooling, lubrication, transmission, final drive, braking, steering, and hydraulic systems, along with electrical components and chassis. The manual offers step-by-step instructions for routine maintenance, troubleshooting common issues, component overhaul, adjustments, and installation procedures. With detailed technical specifications, torque values, clearances, and illustrative diagrams, this English-language resource empowers owners, mechanics, and restoration enthusiasts to effectively maintain and repair their Model C tractor, fostering independence and enabling cost savings.