The Allis-Chalmers Model C tractor, produced from 1940 to 1947, represents a significant piece of agricultural machinery history. As a versatile workhorse, it succeeded the Model B and was manufactured in Harvey, Illinois, USA. This model is characterized by its robust construction, featuring a 226 cubic inch (3.7 Liter) gasoline engine delivering approximately 36 Drawbar HP, and a 4-speed manual transmission. Its engineering prioritizes reliability and functionality, making it a dependable tool for farming operations of its era. The Model C's design emphasizes practical utility, with a focus on delivering consistent performance for a wide range of agricultural tasks. This comprehensive workshop service repair manual provides in-depth coverage for the Allis-Chalmers Model C tractor. It is designed to assist both professional technicians and experienced DIY mechanics in maintaining and repairing the vehicle. The manual includes detailed procedures for engine overhaul, transmission repair, and troubleshooting across all major systems, including electrical, hydraulic, cooling, fuel, ignition, steering, and braking. Owners will find routine maintenance schedules, step-by-step repair instructions, diagnostic information, and essential wiring diagrams, all presented in English and optimized for clarity with zoom functionality.