This is a sign of an incorrect pressure setting. To adjust pressure, remove the aluminum hex cap to expose the adjustment screw. Take care not
to lose the rubber O-ring between cap and pump.
While operating the door, turn the adjustment screw until the squeal lessens or stops. Adjusting this screw will also change the speed at which
your door operates.
When properly adjusted, the door should open at a consistent speed with minimum noise. If excessive noise continues despite adjustments, contact