1981 -- The heaviest wheel tractor that has ever been tested was a Big Bud 525/50 developing 421 drawbar horsepower
and weighing 51,920 pounds (23,364 kilograms).
When Challenger introduced the MT875B track tractor at 570 horsepower, it set the benchmark for power in an agricultural setting and broke all existing records for drawbar horsepower
," says Doug Griffin, Vice President of Marketing for AGCO North America.
For average depth stubble plowing (relatively light duty), about five drawbar horsepower
are required of a tractor for each 14 inch bottom or blade of the plow.
That means that five to nine percent of the drawbar horsepower
on a comparable wheel tractor is lost to slippage.