I'm not sure what you mean by "not disengaging", but if you mean mechanically disengaging it doesn't. The air switch operates a valve. The valve could be stuck. Mine was stuck in a position that did not allow the winch to operate. Sounds like yours may be stuck in an opposite position. Check the valve that is the closest to the winch. You should have a chrome shaft coming out the top with flats on the side and a tapped hole in the center. Put the switch in the off position and put a crescent wrench on the flats of the shaft and see if you can give it a little twist. If the shaft doesn't pull down, give it a tap with a hammer. If this doesn't work check with someone who is familiar with hydraulic circuits. Ron