The Allis Chalmers HD19 is a historical heavy-duty crawler tractor known for its robust construction and versatility in challenging terrains. Manufactured by Allis Chalmers with the power unit produced by General Motors, this tractor stands out with its powerful six-cylinder blower diesel engine. The engine has a displacement of 426 cubic inches, is liquid-cooled, operates with a vertical I-head valve configuration, and runs at a rated RPM of 1750. With a torque converter transmission, it offers 2 forward and 1 reverse gear. The cooling system capacity is sizable at 44 quarts. Dimension-wise, the HD19 is 191 inches long, 109 inches wide, and 89 inches tall, with an operating weight of 40,395 lbs which indicates its substantial build aimed at heavy workloads. Notably, the tractor was designed to be operated over rough and uneven landscapes with its track-driven chassis instead of wheels, hence the absence of tire sizes. Much of the tractor's specific features, such as hitch type and capacity, PTO speeds, starter, and brakes remain unspecified in the provided data. As with heavy-duty tractors from its era, it likely had a manual or open operator station given the years it was in production. The HD19 is indeed a testament to the engineering capabilities of its time and remains a piece of mechanical legacy for enthusiasts and collectors.
