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Big Bud Tractor. Big Bud Tractor. 16-V 747 Big Bud The World's Largest Farm Tractor. In 1977 the Big Bud 747 tractor was built in Havre, Montana. The tractor was built by Ron Harmon and the crew of the Northern Manufacturing Company. The tractor was built to produce 760 horsepower using a 16-cylinder Detroit Diesel engine. The tractor measures 27 feet long, 20 feet wide, and 14 feet tall.
The Caterpillar D11 can be distinguished from the Komatsu D475 by the elevated drive sprocket, or High Drive system, which results in a triangular, rather than oval, shaped track. The updated version of the Komatsu, the D575A, is the world's largest production bulldozer at 168 tons and 1150 hp. A bigger machine, the Acco super bulldozer, was built by Italian firm ACCO, with twin Caterpillar diesel engines giving a combined power of 1,300 hp (970 kW), and weighing 183 tons, in the 1980s, but this was a special model.