Allis Chalmers HD7

The Allis Chalmers HD7 is an agricultural crawler tractor produced from 1940 to 1950. It was built in Springfield, Illinois, USA, with a total production of 1,803 units. It features a General Motors 3-71 blower diesel 3-cylinder liquid-cooled 2-cycle vertical I-head engine with 213 ci (3.5 L) displacement. The tractor has a 4-speed sliding gear transmission with 4 forward and 1 reverse gears. It delivers a claimed drawbar power of 45 hp and belt power of 60 hp, with tested drawbar power of 57.31 hp and belt power of 68.68 hp. The HD7 has a crawler drive with an open operator station. Dimensions include a length of 128 inches, width of 81 inches, height of 69 inches, and operating weight of 14,000 lbs. The tracks are 16 inches wide with a length on ground of 67 inches and ground pressure of 5.83 psi. Serial numbers are stamped on the right-rear of the transmission case or on a plate near the instrument panel.