I have an old style 8.5' Boss V plow. The left side wing would slowly retract back while driving. Now the left side wing won't do anything. The pump is trying to work making a obvious sound of trying to get the wing to extend out, Wing won't move. Please help. I was told that the reason for the wing retracting was maybe a small piece of debris in the valve. Could the same thing cause the wing to not extend? Like I said when I try to extend that side out, The pump makes a noise like it's trying but nothing happens. Thanks for your help guys. I need to plow right now. In about 10 min. I will start taking it apart.