First off I see you have 2 valves. The one on the tractor(the lift all) is pinned to the frame to provide continual pressure to the second(tree). If the fluid is not being used (making implement move) the fluid bypasses the valve and goes back via return. The return on the 2nd valve is directed though the fill hole. As the fluid falls back in it pushes air out(oil is pushed back out with air). To fix route return to drain at bottom of tractor. This forces the return oil to push oil(that pushes air up) and the air leaves via the vent (that is plugged on cap) or open cap.
This post was edited by Cory Schmidt at 13:52:45 12/29/14 2 times.
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