[Cannon51]

I was mowing some 8 inch high grass around the garden this afternoon. About 15 minutes in the pto cut off and wouldn't come back on. I drove it to the house and checked the charging system, got about 15 volts at the regulator and battery. By that time the clutch would come back on, still got 14 something volts with the pto running the deck. I let it all cool off and went back to the garden and finished the mowing. It did cut off again at the end but came back on after a few minutes. What other checks do I need to make before I declare the PTO bad? Is this common behavior for a failing clutch? I have a manual, guess I could see what it says.
Cannon