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

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Liftmaster 1/3 HP opener won't close

I replaced the gears and as per directions I put door in closed position, cycled motor to open position but it won't cycle back to closed position so that I can install chain. Motor hums and then stops. There is no blinking and the eyes on the sensors are aligned. If I move the limit switch it will run but not change direction. I could use any help offered!Thamks

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Strange, was going to say eyes not aligned but you say they are. try over-riding by holding down wall pushbutton or jumping from red and white terminals. Did you increase down force. Are limit switch terminals moving, If it hits one, it should go back to other,

Posted on Feb 12, 2009

  • marty metzger Feb 12, 2009

    did you reinstall rpm sensor board, plug and interrupter cup.

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The problem is not the chain, it is the plastic gear in the unit of the liftmaster Garage Door 1/2 Hp.The plastic gear is not engaging, although it sounds like it is working.

You will have to replace it with a new one, then the liftmaster Garage Door 1/2 Hp will be able to open up once again.

Once you open and remove the old gear, Be sure to thread the screws in all the parts before you install them. Pre-threading them once would really help. Secondly, label the wires on the back of the opener before lowering it to the ladder, so you can put them back in their proper place.

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1 Answer

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