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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.
Twin plumes of black diesel smoke flee silver exhaust pipes above the cab. When linked with a cultivator, the machine can deep rip 36 inches deep at a rate of 20 acres per hour. This thing eats name-brand farm equipment for breakfast. Ron Harman never intended to build the biggest farm tractor in the world. âIt was really built because of a need,â says Harman, who still makes a living building and refurbishing custom tractors.