found the problem.has a clutch pak inside of the casing.Took tractor apart,lookks like a overiding clutch.one way bearing was shot,newpak $525.00to much forme.I put a coupling ,same as thetransmission had joining to the rear end(same length &spline count as the pto pak was)in the pto .Works fine .going to buy a overiding clutch on the pto on back of tractor.