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 customer service.

See steps above to adjust operation speed.

Open the needle valve all the way.

Raise door. As you lower the door, adjust the screw until the door operates properly. When the valve is correctly set, use the set screw on the side to lock the valve in place.

Check the fluid level in the reservoir.

Add fluid and cycle until the door opens properly.

Add hydraulic fluid to the reservoir.

When fully open, the reservoir should be 1⁄4 full.

Door is improperly plumbed.

Refer to the plumbing schematic and the cylinder that is operating properly to re-plumb the malfunctioning cylinder.

Check carefully to ensure your hydraulic system is connected as shown in the hydraulic schematic.

Most problems associated with the door not operating correctly are due to the hydraulic hoses being hooked up to the hard pipe assembly incorrectly.