I just got a real nice International 464 with Syncro Shuttle trans...real nice. I was going to cut a little grass. Hooked up my JD272 groooming mower, engaged the independent pto, and pow, it snapped the shaft in two. Went back, got a woods finish mower, and it sheared off the shaft connecting bolt. Both cutters in perfect working order. Tractor was not revved up. Is there a way to soften the engagement of the pto?