The Allis-Chalmers Model B, produced from 1937 to 1957, represents a significant milestone in agricultural mechanization. Introduced as an affordable and practical tractor, it empowered small and medium-sized farms with reliable power and efficient operation. Its robust inline 4-cylinder, water-cooled engine, featuring overhead valve design, delivered dependable performance for a wide range of tasks. The Model B's engineering emphasized simplicity and durability, making it a workhorse that contributed to increased productivity and accessibility in farming. Its enduring popularity and high customer satisfaction underscore its reputation for reliability and straightforward design. This workshop service repair manual provides comprehensive guidance for the Allis-Chalmers Model B. It covers all essential systems, including detailed engine overhaul procedures, transmission maintenance, electrical system diagnosis with wiring diagrams, and service for chassis components like steering, suspension, and brakes. The manual also includes information on hydraulic systems and bodywork. Designed for both professional technicians and DIY mechanics, it offers step-by-step repair instructions, periodic maintenance charts, troubleshooting guides, and complete overhaul procedures for major assemblies. Its extensive technical depth ensures that users can perform everything from routine tune-ups to advanced rebuilds with accuracy and confidence.