This manual covers the Allis-Chalmers Model WF tractor, produced from 1940 to 1955. The WF, often referred to simply as the Model WF, was a significant agricultural machine manufactured primarily in the United States. Known for its robust design and around 25-30 PTO horsepower, it served as a workhorse during a pivotal era of agricultural mechanization. This tractor features a gasoline engine, typically a 2-cylinder Continental, paired with a manual transmission, often a 4-speed or 5-speed gearbox. Its engineering quality and reliability made it a valuable asset for farmers, and this manual provides comprehensive information to maintain that legacy. The purpose of this workshop service repair manual is to provide complete service, repair, and maintenance information for the Allis-Chalmers Model WF tractor. It is designed for both do-it-yourself owners and professional mechanics, offering detailed coverage of all major systems, including the engine (mechanical and electrical), fuel system, transmission, clutch, brake system, suspension, steering, and body components. The manual includes step-by-step instructions, detailed illustrations, wiring schematics, troubleshooting guides, and critical technical specifications such as torque values and clearances. This resource is essential for performing routine maintenance, diagnosing issues, and executing complete overhauls, ensuring the continued operational integrity of the Model WF.