Allis Chalmers HD21

The Allis Chalmers HD21 tractor is a robust and powerful machine, renowned for its durability and strength. Equipped with a 225 horsepower, supercharged, liquid-cooled, 6-cylinder diesel engine with a vertical I-head valve configuration, it’s designed to handle heavy-duty applications with ease. The engine has a large displacement of 844 cubic inches and operates at a rated RPM of 1800. The compression ratio is 13.3:1, ensuring efficient combustion, and the air cleaner system utilizes an oil bath to keep the engine free from contaminants. The HD21 comes with a torque converter transmission, providing 2 forward gears and 1 reverse, allowing for smooth operations under various working conditions. The tractor is notably heavy, with an operating weight of 45,500 pounds, stability while working is ensured, contributing to safety and efficacy on the job. Measuring 198 inches in length and 99 inches in height, it can handle substantial tasks and work in different environments. Being cooled by 80 quarts of coolant, the engine is designed to maintain optimal running temperatures even during extended work periods. Additional features such as the electric 24-volt starter and the implementation of an oil bath air cleaner showcase Allis Chalmers' attention to detail in creating a tractor that is both reliable and demanding of respect in the field.