The Allis-Chalmers 5020 is a compact utility tractor, produced primarily in the late 1970s and early 1980s, designed for versatility in small farms, landscaping, and residential applications. Known for its robust construction and longevity, the 5020 is capable of handling a wide range of implements, including mowers, tillers, loaders, and plows, making it a dependable choice for various tasks. This tractor is powered by a likely diesel engine, typically around 1.5 to 2.5 liters, delivering an estimated 18-25 PTO horsepower, and features a manual transmission with multiple forward and reverse gears. Its durable design and straightforward operation underscore the Allis-Chalmers legacy of producing reliable agricultural machinery. This comprehensive service repair manual and illustrated parts catalog provides essential information for maintaining, repairing, and identifying components for the Allis-Chalmers 5020 Tractor. It covers a wide array of systems, including detailed procedures for engine, transmission, hydraulic, electrical, drive axle, steering, and brake systems. The manual includes regular maintenance schedules, troubleshooting guides for common issues, step-by-step repair and overhaul instructions, and detailed illustrations with part numbers. This resource is designed to assist owners, mechanics, and technicians in ensuring the longevity and optimal performance of their 5020 tractor through clear, English-language instructions.