Why 1870s Allis-Chalmers HD-41 Dozers Still Run While Modern Dozers Seize After 15,000 Hours

Why 1870s Allis-Chalmers HD-41 Dozers From Strip Mines Still Run While Modern Dozers Seize After 15,000 Hours The Allis-Chalmers HD-41 crawler tractor introduced at the 1963 Chicago Road Show weighed 129,000 pounds fully loaded and produced 524 horsepower from a Cummins VT-1710-C four-cycle turbocharged V-12 diesel engine. At 70 tons it was the heaviest and most powerful crawler tractor built when it entered full production in 1970 after extensive prototype field testing. The machine measured 20 feet 2 inches long, 11 feet 1.5 inches wide, and stood 10 feet 4 inches tall with smokestacks. It featured three forward and three reverse gears in a power-shift transmission giving 7.4 mph maximum speed. Bulldozer blades reached 20 feet wide in semi-U and full-U options. The HD-41 was manufactured in Springfield Illinois and marketed as capable of lowering unit cost per cubic yard through reliable production. In 1974 Allis-Chalmers entered a joint venture with Fiat and the model became the Fiat-Allis 41-B with iterations produced into the 1980s. Many HD-41 machines from the early 1970s remained in running condition 45+ years later. A 1972 model was rescued from scrapping in Allendale County South Carolina still mechanically sound enough to be restored to full operation for equipment shows despite decades sitting exposed to weather.