Hi folks! Baling last fall, my speed began to slow when going up small grades. RPM speed and PTO stayed same yet tractor slowed. I would push clutch in and release it and tractor would take off again. Over time, this progressed with more frequency. Trying to limp through the fall and troubleshoot on my own, I adjusted the bolt under the clutch pedal. Tractor worked fine then began to slowly go back to doing the same thing. Adjust the bolt again (it didn't matter which way I turned it) then the tractor would pull again. Given the ability for it to pull I don't thing its the actual clutch wheel. In the threads, I saw something a potentiometer? Given the low hours and limited use as well as the inconsistent pattern, seems more like a valve or pressure. Any ideas?