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

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I have an old sears garage door opener - model number 139.53515sr. I am not handy and was feeling very proud of myself that I was able to re-attach the chain to the gears on the machine. I unplugged the opener while I was working on it. After I "fixed" it I now notice that the garage door goes up immediately after it reaches the bottom of it's run. Before I go out and buy a new one I was hoping that someone might have a manual for this model or some advice on what I can do to prevent the door from opening on its own.

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  • hjf323 Jan 26, 2009

    Thanks for getting back to me. I'll get back to you and let you know how i did.



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Adjust down travel. or, you may have chain out of sync and will need to reset chain in position. get motor up and put chain on in up position

Posted on Jan 26, 2009


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