I have a TC 29 tractor with a Hydrostat transmission and have been using it quite a bit over the last week bush hoging. When I first started, The Rear PTO would occasionly jump out when bogged down but over the course of the last few days it has got a lot worse to the point that once i engage it, I have to hold it in position with my hand The handle actually pops out of position when i accelerate the engine now. Does anyone know what is happening and what i need to do to fix this. I'm certain I can fix anything that it may be, I just wanted to know if anyone knew what the problem before i started to dig. Thanks...Joey