The Allis-Chalmers WC tractor, produced from 1933 to 1951, represents a significant milestone in agricultural machinery. This highly successful and versatile tractor is celebrated for its reliability, economic operation, and robust design, making it a cornerstone of mid-20th century farming. Engineered by the Allis-Chalmers Manufacturing Company, known for its extensive legacy in agricultural and industrial equipment, the WC typically features a 2-cylinder engine available in gasoline or diesel variants, delivering approximately 18-20 drawbar horsepower. Its enduring appeal stems from its fundamental engineering, designed for longevity and straightforward maintenance, contributing to historically high user satisfaction. This comprehensive workshop service manual provides in-depth information for the Allis-Chalmers WC, covering all areas of repair and routine maintenance. It details procedures for the engine, fuel system, cooling system, lubrication, ignition, electrical system, transmission, drive axles, steering, brakes, suspension, and hydraulic systems. The manual includes step-by-step instructions for component overhaul, assembly, disassembly, and adjustment procedures, alongside troubleshooting guidance for common issues. With included diagrams and printable pages, this resource is an essential tool for tractor owners and mechanics seeking to maintain and repair their WC, ensuring its continued performance and longevity.