I'm running the tractor at about 2000 rpm when using the PHD. It is a PTO driven PHD. I'm using an 8" auger. The question I had is what, if any, damage could I do to the tractor when the PHD corkscrews in and stalls the engine before I have a chance to disengage the PTO. I try to take small bites and lift up often. I also try and disengage the PTO, but if you know anything about the controls on a BX25D you would see that it can be tricky to do. The PTO lever is on the left hand side and the lift lever is on the right hand side. So trying to handle controls on both sides and twisting around to look behind you is difficult.