Question about Chamberlain Powerdrive PD422D 1/2 HP Security Plus Screw Drive Garage Door Opener

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Chamberlain Whisper Belt Drive

The belt drive on my garage door opener keeps slipping off the pulley. The garage door will not open with the opener. I have put the belt back on the pulley and attempted to tighten everything several times and it keeps happening. How do I fix this?

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Door does not close without holding wall button in

Posted on Nov 21, 2008

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Be sure the belt retainer #41A4371 is in place over the pulley on the powerhead.

Posted on Jan 08, 2009

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Replace the belt
good luck
please mark the post with a fixya

Posted on Feb 20, 2008

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Hi. I have seen this before, although usually not from chamberlain garage door openers.

Pull the release cord that unlocks the door from the opener, and manually open the door ALL the way open.

Then lock back in place in the open position.

Then use automatic opener to shut door.

It will close very slowly, but should close all the way.

Then, open the door again using the remote, and the door will once again open slowly, this time it should open all the way.

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Chamberlain door opener manual


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I just had that problem this morning and the cause was that the springs that help hold the weight of the garage door were broken. This caused the garage door opener to raise the garage door a fe inches and then drop again. We called in a professional and $200 later we had new springs and everything works fine now.

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You could always use "Belt Ease" from an Auto Parts store. It's made for squeeky belts.
-Lonnie

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