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

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The door goes up about 1 to 2ft and then stops. When it stops the overhead light on the opener and the led light on the wall mount switch goes off like the opener has lost power.

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I has a strippes drive gear in my sears chain driven garage door opener. Replace the gear dirive and shaft with all the other gears provide by repair kit. On the first try the garage door opened ok but didn't open fully. I adusted the up pressure. now the door only moves a couple of inches up or down the the motor stops. Further adjustments made no change what should I do next?

Thanks
Jim

Posted on Jul 08, 2010

  • Don Maggard Jul 08, 2010

    Make sure you put the black cup back on the 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 the issue, then you probably did not have the motor shaft pushed all the way back when you tightened the coupler after replacing the worm gear. Loosen that coupler up and from the front of the motor (opposite end in which the coupler is on) push the shaft back as far as it will go. Hold it there while you tighten the coupler back up and then try it.

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It sounds like you have a loose connection either where the opener plugs in or on the logic board around the small transformer.

Posted on Jul 06, 2010

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