Question about Chamberlain & Liftmaster Garage Doors

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Garage door worm and drive gear were replaced. Evrything appears to be replaced properly, but even without the chain on, the door moves only a few feet then reverses.I checked to be sure the motor shaft was pushed out as far as possible before tightening the collar.

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Sounds like the rpm senor may have be out of place - the fingers on the cup must break the field between the sensor pickup

Posted on Apr 28, 2011

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Posted on Jan 02, 2017

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