I replaced a bent primary countershaft in this 9570. Got it back together and still have a vibration. Pulled shaft and took it to a machine shop and it is out of round .002” which is well within spec. Gearbox splines are fine. New clutch hub on electric clutch.
Now here’s where it gets strange. Customer said when he get the grain tank 1/4 full or fuller the vibration is gone. He empties the tank and it comes back. I told him to check the front grain tank legs and the frame under the primary gear case for cracks. Other than those two things I’m lost.