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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.
Print This Article Tell A Friend List of All Stories in This Issue Â«Previous Article Next ArticleÂ». We received a lot of mail a few years ago when we stated that a South African-built 4-WD ACO tractor was the biggest in the world (Vol. 19, No. 4). Readers were quick to tell us about other tractors that have attempted to lay claim to the title, World's Biggest. One frequently mentioned candidate was Versatile's Big Roy, an 8-WD, 600 hp giant that was built as a prototype and is now on display at a farm museum in Manitoba.