This comprehensive workshop service and repair manual provides in-depth information for Allis-Chalmers D21, D21 Series II, Two Ten 210, and Two Twenty 220 tractors. It is a valuable resource for both professional mechanics and DIY enthusiasts, offering detailed instructions and illustrations to guide you through various repair and maintenance procedures. The manual covers a wide range of topics, including: * **Brakes:** Learn how to diagnose and repair brake issues, including adjustments, component replacement, and troubleshooting brake system problems. * **Clutch:** Understand the operation of the clutch system, perform adjustments, and replace worn-out components. * **Cooling System:** Maintain optimal engine temperature by learning about the cooling system's components, including the radiator, fan, thermostat, and coolant. * **Diesel Fuel System:** Understand the fuel injection system, troubleshoot fuel problems, and perform routine maintenance on fuel lines, filters, and injectors. * **Differential:** Learn about the differential's function, diagnose and repair gear problems, and replace worn components. * **Electrical System:** Diagnose and repair electrical issues, troubleshoot starting problems, and understand the operation of lights, gauges, and other electrical systems. * **Engine:** Gain in-depth knowledge of the engine's operation, perform tune-ups, troubleshoot performance problems, and learn about component replacement procedures. * **Final Drive:** Learn about the final drive's function, diagnose and repair axle problems, and replace worn components. * **Front System:** Understand the front axle, steering mechanisms, and perform maintenance on related components. * **Power Lift System:** Learn about the hydraulic lift system, troubleshoot lift problems, and perform adjustments and repairs. * **Power Steering:** Understand the power steering system's operation, diagnose problems, and perform maintenance and repairs. * **Power Take-Off:** Learn how the power take-off (PTO) operates, troubleshooting PTO problems, and performing adjustments and repairs. * **Service Data:** Access vital specifications, torque values, and other technical data for your tractor. * **Steering System:** Understand the steering system's components, diagnose steering problems, and perform adjustments and repairs. * **Transmission:** Learn about the transmission's function, troubleshoot shifting problems, and perform adjustments and repairs. With this manual, you'll have the knowledge and resources to effectively maintain and repair your Allis-Chalmers tractor, saving you time and money in the long run.

The Allis-Chalmers D21, D21 Series II, Two Ten 210, and Two Twenty 220 tractors were a line of versatile and durable farm implements produced by Allis-Chalmers Manufacturing Company. These tractors were known for their robust construction, powerful engines, and reliable performance, making them popular choices for a wide range of agricultural tasks. The D21 series, introduced in the early 1960s, featured a 4-cylinder diesel engine with a displacement of 210 cubic inches. These models were equipped with a variety of transmission options, including a standard 6-speed manual transmission and an optional 8-speed transmission. The D21 series tractors were designed to deliver reliable and powerful performance in a wide range of farm applications. Their robust construction, coupled with features like power steering, power take-off, and adjustable hydraulic lift, made them adept at tasks like plowing, disking, planting, and harvesting. The D21 series was known for its fuel efficiency and durability, making it a popular choice for farmers seeking a reliable and economical tractor. While production of the D21 series ceased in the late 1970s, these tractors continue to be appreciated and used by farmers and collectors alike, a testament to their sturdy build and lasting legacy.