While operating my bush hog I noticed that speed of travel down was kinda slow so I adjusted my return valve to a faster setting which wasn't much of an adjustment, maybe a couple of degrees. It would only move slightly. Now the rate of decent borders on damaging the bush hog if I'm not careful. So I figured I would reset it back to it's original position. It won't move, it's like it's frozen. Is there a way to relieve the pressure so that this valve will operate correctly, I just don't have the guts to use a persuader on it. Any help here is greatly appreciated.