stevenf
Platinum Member
I bought a Bison SVH-1 Subsoiler the thing weighs 220lbs and is a monster compared to the King Kutter model. It has a 25" X 1.25" parabolic shank on it and in looking at the specs is designed for a minimum 40hp tractor. I'm using a 90hp M9000 to pull it. I got it home last night and rigged my 3point up for it, It has a 3/4" #3 grade main bolt and is supposed to have a 5/8 #3 grade shear bolt but the one that was on it had no markings so we'll assume it was a grade #2 anyway as soon as it touched the ground, it sheared that bolt like it wasn't even there. Since I'm using a 90hp machine and the subsoiler appears to be built like a tank am I safe in going to a grade 5 or 8 for the shear bolt especially since its only a 5/8" bolt and the main bolt is 3/4". The bolt they had on it was subgrade but was the correct length as none of the threaded area was exposed to the shear area it was solid smooth 5/8" that it sheared.
Steve
Steve