Make sure the gear and Wheel has enough space when in the retracted(or down) position so that the retract goes through entire locking position or travel. I believe if the piston does not travel the entire length, you will get an air leak as the piston is constantly trying to hold the gear up. This is what happenned on my Roo, one wheel would rest on the Turbine hoses, and it would not lock up completely. The air would leak out very quickly, After moving the lines, the gear now holds pressure for days.