Question about Chamberlain Powerdrive PD422D 1/2 HP Security Plus Screw Drive Garage Door Opener
Here is a link to the chamberlain powerdrive PD422D manual.
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Posted on Jan 13, 2008
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Posted on Jan 02, 2017
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Open the garage door fully by pressing the wall control button. The bottom section of the door should be right at the header in the "full open" position. If it is too far back, the door cable can become misaligned. If it is not back far enough, you may not be able to get your vehicle in and out of the garage.
Position a stepladder behind the garage door opener motor. Locate the limit adjusting screws on the left side of the motor housing. Have a friend stand by the wall control button.
Insert a screwdriver into the slot for the "up limit" adjustment screw. Turn it to the right to decrease the door travel and turn it to the left to increase it. Turn the screw in small increments.
Close the garage door by having your helper push the wall control button. Notice the seal between the door and the floor--there should not be any light coming through. Adjust the "down limit" screw in the same way if necessary.
Operate the door by the pressing the wall button and check your adjustments.
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