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

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Motor clicks but will not open door

I replaced the gears and the motor will click and hum a little. If I use a plier to turn the shaft coming out of the motor the opener will work a couple of times and then stop working. The yellow light on the back flashes constantly. Any suggestions or advice

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  • huntndogz Feb 17, 2009

    Any idea what is causing the motor to overheat? There was no problem until the gears were changed.

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Does it simply click then hum? or does it sound like something's moving inside? if you can hear movement inside I'd guess stripped gears. if it just hums I'd have to agree that the chain is bound somewhere. Either way it doesn't sound like it's the electric eyes to me. You should be able to bypass them if you still want to but you have to know if your model uses NO or NC contacts first.

Posted on Feb 18, 2009

  • mike Feb 18, 2009

    oops, wrong thread... I meant that answer for John_Farrell.



    I would check the gear assembly again.. it sounds like something's a little too tight in there. Possibly a gear just not in all the way and the end is rubbing. Good luck

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Motor is over heated shut down unplug 30 min

Posted on Feb 17, 2009

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1 Answer

As you push remote door travels a shot distance stops,push button and travels short distance again and again. What is wrong?


Most common failure is internal plastic gear. If we assume that this is the failure i would suggest disconnect the travel engage latch to the non engaged position. Cycle the door and observe if there comes a time that the motor is humming and the chain or latch is not moving. Other than reversing for just a brief moment at the end of travel at no time should the motor hum as turning and the latch feature not move.

What I suspect is happening in the down direction door wants to close and as the gear rotates the gear slips . This repair is not so difficult for the DIY with some mechanic skills and tools. Lots of u-tube showing you how, Parts are available. Confirm the right part for your specific model. Purchase the gear and shaft as an assembly if you not sure about the difficulty. Part prices are all over the map. Shop around. You can buy just the gear a little more difficult to replace.




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His 15 minute estimate may be a little optimistic.
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Is the trolley jammed against the bolt just in front of the motor? If so, loosen the chain until the tension is off the trolley and then run the motor until the door is closed. Now locate the up limit on the side of the motor unit and turn this control 2 full turns in the opposite direction of the arrow printed on the cover. Tighten the chain.

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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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