I have a 2760, 27 hp generac. When I engage the pto, the blades turn normally for a short while and then slow down so much that they won't cut grass. When I look at the clutch, I notice that the clutch bracket is moving freely and is not attached to anything. I don't know what its function is but I presume it's supposed to be bolted to something or have a spring attached to it. Any ideas?