At this point, I think the best I can do for you is to just post the details of how the system works. Enjoy the "light" reading. You'll have to make the decision on whether you think the noise is too loud to ignore. It might go away after using the PTO for awhile. A similar thing happened to a forum member named Tractorganic. His noise disappeared and did not come back. Yours might do the same.
I laughed out loud at the first picture of the guy with the hammer trashing his tractor... well - that's not what they were showing, I'm sure... but that would be me!