The cutting depth depends on how low your center link and 3pt arms can go. Standard Cat 1 should get 30 to 40” depth. The Augers that Behlen offers are 48” long.
It is not recommended to put any auger larger than a 12” diameter on our post hole diggers. Even though an 18” auger, with a 2” shaft, would fit onto the output 2” shaft of the gearbox, the Horsepower of the gearbox is not rated for it. You could potentially damage the gearbox, the auger, and the tractor.







