Question about Chamberlain Power Drive 1/2 Hp Heavy-Duty Screw Drive

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Chamberlain power drive garage door opener stops prematurely in both opening and closing

In order to eliminate possibilities, I disconnected the door to see how the unit would work. In each test, the trolley would stop at a different spot and the light would turn off. I would wiggle the trolley and the light would come back on. The problem seems to be associated with the trolley. I don't know where to go from here.

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  • 126 Answers

I'm not familiar with the operation of this particular device but, based on past experience with others, I would say that if this is a newly-installed device it still has the factory safety settings and they're too low for your installation. There should be two knobs on the case to set the tolerances for raising and lowering the door; one to protect against blockages on the way up and the other on the way down. Try putting them both at the maximum. If that works, reattach the door and check again. If it still works, turn the "up" control down until it doesn't anymore then turn it back up just a bit. Then put a full roll of paper towels on the floor and adjust the "down" control until the door going down stops and reverses when the cardboard tube in the middle of the roll starts to deform. Good luck!

Posted on Nov 23, 2013

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