Something else. I don't know what you know or don't know. You would do well to learn from MY mistakes and don't repeat them. Tighten ALL bolts NOW. Keep a check on them periodically. Check oil in gear box and keep it checked. When parking the cutter, park it on a piece of cardboard so you can see if the bottom seal leaks. When engaging the cutter, have the tractor rpm at MINIMUM. Once engaged then go up on rpm's. Buy a few shear bolts and keep them on the tractor along with the wrenchs for them. This is NOT a heavy duty cutter, don't use it as a chainsaw.