I have a TC33D that the PTO had been jumping out of gear. I've read posts suggesting that the problem was a detent spring and ball that I tried but without any success. I talked to two dealers who stated it was the PTO gears and although that was not what I wanted to hear I bought the gears. Upon tear down of the rear end the two gears [number 10 and 19 on parts page 07F01 - PTO Gears] were trashed. It's a little over three hundred dollar repair for the gears. Hopefully this will be helpful to others who are having this problem.