I have a bx2200 w\60" mmm that keeps comming off. I've had the tractor for 2 weeks now and mowed apprx. two acres twice. The first time I mowed, the mower deck came off twice. Both times the right rear mounting pin had come out somehow. Brought the tractor back to the dealer last Monday, explained what happened, said he has never heard of it happening before, but he would check it out. He kept the tractor all week, and of course, couldn't find anything wrong. Took it home yesterday evening, started mowing, and a acre and half later the deck dropped on right side again. The ground wasn't real rough, no dipps, slight incline. If anybody has an ideal what's causing the rear pin to come out I would sure appreaciate it.