I have an Allis Chalmers 160 that has no resistance on the three point lift lever. It raises and lowers but when I turn loose of the handle the 3 point drops and the lever drops to the bottom of the quadrant. I don't see anything on the outside that might allow me to tighten to add resistance to the lever. I'm thinking it must be inside. Does anyone have insight as to what I'm looking for to correct this issue.