The Allis Chalmers D-21, D-21 Series II, 210, and 220 Workshop Repair Service Manual is a comprehensive guide for servicing and repairing these tractors. This manual, created by the manufacturer, provides detailed information for all models, engines, trim levels, and transmission types. It's the same manual used by professional service shops, offering a wealth of information for diagnosing, repairing, and maintaining your tractor. This manual encompasses a wide range of topics, including engine operation, lubrication, cooling, fuel systems, disassembly and servicing procedures, general maintenance, clutch and transmission operation, drive chain and sprockets, rear axle and brakes, front axle and steering, suspension components, bodywork, intake and exhaust systems, hydraulics, electrical systems, routine maintenance, advanced troubleshooting, and comprehensive wiring diagrams. The manual is structured for ease of use, with detailed substeps expanding on repair procedures, notes and cautions highlighting crucial information, numbered instructions guiding each repair step-by-step, bold figure numbers for quick reference to illustrations, and detailed diagrams and photos to visually guide you through every procedure. Enlarged insets allow you to examine parts in detail, while the numbered table of contents enables you to quickly locate the information you need. This manual is an invaluable resource for anyone seeking to perform repairs or maintenance on their Allis Chalmers D-21, D-21 Series II, 210, or 220 tractor.

The Allis-Chalmers D-21, along with its later Series II iterations, the 210 and 220, were versatile and robust farm tractors that played a critical role in agricultural advancements during the mid to late 20th century. Introduced in 1955, the D-21 was a significant departure from previous Allis-Chalmers designs, featuring a more compact and modern appearance. Powered by a 2.7-liter, four-cylinder gasoline engine, the D-21 delivered a respectable 21 horsepower, allowing it to handle a wide range of tasks, including plowing, disking, cultivating, and hauling. The tractor was praised for its maneuverability, thanks to its short wheelbase and responsive steering. While the D-21 offered exceptional performance, the introduction of the Series II models in 1962 marked a significant upgrade. The D-210 and D-220, both featuring updated styling and a more powerful 3.3-liter engine, delivered 32 and 35 horsepower respectively. These models further cemented the D-21 line's reputation for reliability and efficiency, making them highly sought after by farmers and ranchers across North America. The Allis-Chalmers D-21 and its successors, the D-210 and D-220, continued to be produced until the early 1970s, leaving a lasting legacy on the agricultural landscape. Despite their age, these tractors remain highly collectible and are often sought after by enthusiasts and restoration projects. The D-21 Series II, with its increased power and refined design, stands as a testament to Allis-Chalmers' commitment to innovation and their dedication to providing farmers with dependable and powerful machinery. The availability of workshop manuals for these models further highlights their enduring importance, ensuring that these iconic tractors can continue to serve their owners for years to come.