THE MACHINE THAT OUTGREW THE PRAIRIE:

THE STORY OF MONTANA’S BIG BUD TRACTOR

Introduction

On the high, wind-scoured plains of north-central Montana, where wheat fields run to the horizon and the growing season is short and unforgiving, farmers have long measured their equipment by a simple standard: how much ground could it cover before the weather turned against them. It was in this landscape, and in response to this exact pressure, that a small manufacturing shop in Havre built the largest farm tractor the world had yet seen. The Big Bud 16V-747, completed in 1977, was neither a novelty nor a publicity stunt. It was the culmination of a decade of experimentation by a handful of Havre mechanics who had built a business rebuilding tractors too big for anyone else to service, and who eventually decided to simply build the biggest one themselves. Its story belongs as much to the economic history of Montana’s Hi-Line as to the history of American agricultural machinery.

From Wagner Dealership to Northern Manufacturing

The roots of the Big Bud tractor lie not in an inventor’s workshop but in a dealership. In the early 1960s, Wilbur “Willie” Hensler ran a dealership in Havre selling Wagner tractors, large articulated machines built by the Wagner Company for the wheat and grain operations of north-central Montana and the Canadian prairies. Hensler’s dealership did brisk business not only selling new Wagners but rebuilding and “repowering” older ones with larger engines for local farmers whose acreage had outgrown their machinery, work overseen by the dealership’s service manager, a man known locally as “Big” Bud Nelson.

That business model collapsed at the end of the decade. On December 31, 1968, the Wagner Company signed a manufacturing agreement with John Deere that effectively barred Wagner from producing its two most popular models, the WA-14 and WA-17, or introducing any new tractor for five years. The arrangement, meant to keep the financially troubled Wagner company solvent, instead hastened its decline; the Deere-badged Wagners sold poorly, and within a few years Wagner tractors were no longer being built. For Hensler’s dealership, dependent on a steady supply of new Wagners, the deal was fatal to the business as it existed. Rather than close, Hensler and Nelson formed a new company in Havre in 1969, Northern Manufacturing, with a straightforward aim: to build an improved version of the Wagner tractor from the ground up for Montana’s wheat farmers.

The first product of that partnership was the HN-250, its name drawn from Hensler and Nelson’s initials and its rated horsepower. It borrowed a cab and frame from existing Wagner stock but paired them with a new Cummins NT855 engine and a twelve-speed Fuller transmission, and it dispensed with the three-point hitch in favor of a heavy center-mounted swinging drawbar suited to the tillage equipment Montana grain farmers actually used. Among the earliest buyers of this new “Big Bud” line was Leonard Semenza, who farmed some 35,000 acres near Fort Benton and Chester in Montana’s Golden Triangle, the wheat-growing region bounded roughly by Havre, Great Falls, and Shelby. By the mid-1970s, Northern Manufacturing was turning out a dozen or more of the big machines a year, priced as high as sixty thousand dollars apiece, and had adopted a distinctive white paint scheme that became the brand’s visual signature.

Building the 747

In 1975, Hensler and Nelson, looking to step back from the business, sold Northern Manufacturing to Ron Harmon, a Havre businessman who kept the company in the same small city and largely the same workforce. It was under Harmon’s ownership that the company built the machine for which it is now best remembered. In 1977, two California cotton farmers, brothers Elmer and Melvin Rossi of the Bakersfield area, approached Northern Manufacturing with an unusual request. Their twenty-thousand-acre operation required deep ripping, a soil-conditioning process that loosens compacted earth to a depth of roughly twenty inches, and they wanted a single machine capable of doing in one pass what had previously required three Caterpillar D-9 tractors working in sequence. Cost, by most accounts, was not the limiting factor; the Rossi brothers wanted the largest tractor that could be built.

What Northern Manufacturing delivered was the Big Bud 16V-747, so named for its sixteen-cylinder Detroit Diesel engine and, according to company lore, for the Boeing 747 jetliner it was meant to evoke in scale. The tractor originally produced 760 horsepower, stood some fourteen feet tall, stretched twenty-seven feet in frame length, and spanned 25 feet 6 inches across its dual tires, riding on custom eight-foot-tall tires manufactured by United Tire Company of Ontario, Canada, the only supplier willing to produce tires of that size. Fully fueled, with a thousand-gallon tank topped off, the machine weighed more than one hundred thousand pounds. The final cost came to approximately three hundred thousand dollars, a considerable sum for a single piece of farm equipment in 1977. Design work is generally credited to Wilbur Hensler, though it was Harmon and the Northern Manufacturing crew who engineered and assembled the finished tractor.

The 747 was, by design, a one-of-a-kind machine, but it was not Northern Manufacturing’s only product. Between roughly 1969 and 1984, the Havre plant produced an estimated 550 Big Bud tractors of various models and horsepower ratings for wheat and grain operations across Montana and the Canadian prairie provinces, of which the 747 was simply the largest and most extreme example.

Working Life and the Long Road Home

The Rossi brothers put the 747 to work on their cotton acreage for eleven years, using it for deep ripping exactly as intended. Afterward, the tractor was sold to Willowbrook Farms in Indialantic, Florida, where it performed similar soil work for a time. By the late 1990s it had fallen out of regular use, in part because United Tire, the sole manufacturer of its distinctive tires, had gone out of business, complicating maintenance.

In 1997, the tractor returned to Montana. Brothers Robert and Randy Williams of Big Sandy purchased the 747 and brought it to their farm in Chouteau County, within about sixty miles of the Havre plant where it had been built two decades earlier. Under the Williams brothers, the tractor was repainted, fitted with new tires and a boosted engine tune reaching as high as 1,100 horsepower, and put back to work pulling an eighty-foot cultivator, covering more than an acre of ground per minute at speeds up to eight miles per hour. The Williams family also emphasized a point of regional pride: aside from its Canadian-made tires, the 747 was entirely American-built, a detail they highlighted when displaying the tractor at county fairs and agricultural events around Montana.

The tractor’s working life ended again around 2009, when its original tire stock finally proved irreplaceable. For roughly the following decade it stood as a museum piece, first at the Heartland Acres Agribition Center in Independence, Iowa, beginning in 2010, and from 2014 onward at the Heartland Museum in Clarion, Iowa, where a dedicated shed was built to house it. In 2020, a tire manufacturer fitted the 747 with a new set of custom low-sidewall tires, and the Williams family brought the tractor back to Montana, where it has since resumed limited field work on the family farm near Big Sandy.

Decline, Bankruptcy, and a Quiet Revival

Northern Manufacturing’s fortunes, meanwhile, followed a familiar arc for small agricultural equipment makers of the era. The company went bankrupt in the early 1980s amid a broader farm recession and intensifying competition from larger manufacturers such as Steiger, Versatile, and International Harvester, all of whom were building their own large four-wheel-drive tractors by the end of the decade. The Havre operation was purchased by the Meissner brothers in 1985, and production slowed through the remainder of the 1980s before ending altogether; the last Big Bud-branded tractor is generally dated to 1992.

Ron Harmon, who had built the original 747, did not leave the business. He went on to found Big Equipment Company, based in Havre, which specializes in rebuilding and custom-building older, non-computerized tractors, including many original Big Bud units, for farmers who prefer mechanically simple equipment they can repair themselves rather than machines locked behind manufacturer-controlled software. In 2023, working in partnership with the Rome Plow Company, Big Equipment resumed limited production of new Big Bud-branded tractors, in the 300-to-700 horsepower range, unveiling the revived line at the CONEXPO-CON/AGG trade show in Las Vegas that March. Production has remained small, on the order of a handful of units per year, but the company has stated an intention to expand it.

Conclusion

The Big Bud 747 is often described, understandably, in terms of superlatives: the largest tractor ever built, a machine capable of doing the work of three others, a piece of engineering as large as a small house. But its origins are considerably more modest and, in a Montana context, more telling. It emerged from a Havre dealership’s response to a business crisis, from mechanics accustomed to solving the specific problem of farming enormous acreage across short growing seasons on the northern plains. The tractor’s decades-long path, from a California cotton farm to a Florida ranch to an Iowa museum and finally back to a wheat farm sixty miles from where it was built, traces a broader pattern in American agricultural history: equipment scaled ever upward to match consolidating farm operations, only to become, in time, a curiosity valued as much for its history as for its horsepower. That the tractor now sits again on Montana soil, still occasionally pulling a cultivator across the same kind of ground its builders knew well, gives the story a resolution that most industrial artifacts never receive.

Works Cited

“Big Equipment of Havre Brings Big Bud Memorabilia to MAGIE.” Ravalli Republic, 27 Jan. 2017, ravallirepublic.com/business/agriculture/article_7693ca2a-b152-578b-905c-8a5445b7b893.html. Accessed 7 Sept. 2026.

“Big Buds from South Dakota! - Interesting Iron.” Tractor Zoom, 17 June 2021, tractorzoom.com/blog/big-buds-from-south-dakota. Accessed 7 Sept. 2026.

“Havre Boasts Second-Largest Tractor in World - As Well as First.” Havre Daily News, republished by Havre Weekly Chronicle, 15 Jan. 2014, www.havredailynews.com/story/2014/01/15/local/havre-boasts-second-largest-tractor-in-world-as-well-as-first/201829.html. Accessed 7 Sept. 2026.

“Return of the Legendary Big Bud Tractor.” GrainsWest, Sept. 2023, grainswest.com/2023/09/return-of-the-legendary-big-bud-tractor/. Accessed 7 Sept. 2026.

“Tractor Talk.” Diesel World, 28 Nov. 2022, www.dieselworldmag.com/diesel-tractors/tractor-talk-7/. Accessed 7 Sept. 2026.

Weber, Jeremy. “World’s Largest Farm Tractor Coming to Kalispell.” Daily Inter Lake, 19 June 2021, dailyinterlake.com/news/2021/jun/19/worlds-largest-farm-tractor-coming-fairgrounds/. Accessed 7 Sept. 2026.

Williams Big Bud. Williams Big Bud, williamsbigbud.com. Accessed 7 Sept. 2026.