Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

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My liftmaster garage door will not close..I have changed the main gear in the machine.. but I have also tried to make it shut without the door attached and it still will not go down. it goes about a foot then stops. It will go down if i hold the garage door open down the whole time its closing... think you can help?

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Make sure you put the black cup back onthe end of the motor shaft and that it is pressed all the way on.Make sure the RPM sensor is plugged in. If neither of these are theissue, then you probably did not have the motor shaft pushed all theway back when you tightened the coupler after replacing the wormgear. Loosen that coupler up and from the front of the motor(opposite end in which the coupler is on) push the shaft back as faras it will go. Hold it there while you tighten the coupler back upand then try it.

Posted on Dec 11, 2009


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