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

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My Craftsman 1/2 HP Garage Door Opener stopped working. The motor is running but chain isn't moving. The actual door goes up and down fine.

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Remove the cover and take a look. I'm sure you will find the drive gear is stripped. It is a white nylon gear just in front of the motor. You can buy one at any good door service company. The part number is 41A2817 and it comes with instructions.

Posted on Nov 16, 2009

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I too had the same problem. However, I replaced the gear and now the motor will only run 3-5 secs.

Posted on Nov 18, 2009

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: craftsman garage door opener

My problem is a little different. Chain was loose and when door hit my bumper ( car not all way in... ) chain poped off drive gear on top of opener. I got chain back on but drive gear was in a different place on chain. Door would only go down about 2 feet from floor and would hit upper limit peg at top (the one on the rail near opener motor.) I fiddled with the Up/Down adjustment screws on the side until it would go all the way up and down but it is over sensitive when down, hitting bottom and going back up or stoping about 3" from bottom with only a touch of adjustment to adjusting screw.
Should I take chain off and try to get it back in the range it was in before and adjust screws back in the range they were?

Posted on Apr 17, 2008

  • 6 Answers

SOURCE: Craftsman Garage Door Opener Won't Open

When mine did this, it was because the nylon gears that drive the chain had stripped. My wife had to live without the opener for a week or more, but I was able to find a new gear kit online and replace the damaged gears. It wasn't difficult.
The other option is to buy a new opener.

Posted on Dec 07, 2008

  • 6 Answers

SOURCE: motor runs but door does not open

reconnect your safty release red cord

Posted on Feb 17, 2009

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SOURCE: Craftsman opener motor works, but chain does not move.

If the motor is working but the chain does not move you must remove the cover on the motor and check to see that the chain is on the sprocket. If the chain is on the sprocket and the sprocket is not moving but the motor shaft is moving then the sprocket must be retightened onto the motor shaft.

Posted on Apr 20, 2009

  • 1 Answer

SOURCE: Craftsman garage door opener motor runs but chain

open the motor,is the plastic star in mothor, fix , the price is 10dlls

es la estrella de plastico que esta desgasta, solo abre el motor y cambiala por otra el costo es de 10dlls mas omenos, si nesecitas hayuda mi msm es cissat_alex@hotmail.com

Posted on Jan 12, 2010

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Craftsman 1/2hp garage door opener works fine to open door but to close I have to hold button down. If not, door won't move and lights flash 10 times.


10 flashes mean sensors are obstructed... something is in the way of the door or they are not facing each other. Clear the obstruction or realign the door and it will work.

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Garage door moves few inches and stops, springs are fine, sensros are fine.


If it is not blinking when it stops, then the capacitor is blown. Replace the capacitor and it should resolve the problem.

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All garage door openers have a quick release. Have you checked to make sure that is locked in place? Most have a cord hangin from it and you pull it which releases it from the chain. Make sure that is engaged and it should work.

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2 Answers

My older Craftsman garage door opener comes down about 6" & then goes back up. I just replaced all the rollers o& the opener worked fine. Then I tightened the chain on the opener & it worked ok...


If the main light flashes 10 times when the door goes back up it is a door sensor problem. You chain should sag just a little. If you tighten it too much it will click as it goes over the sprocket. You can increase the down force which is an adjustment near where all those white wires go. A 1/4 turn should be enough. Release the door from the opener and operate it by hand. It should move freely and when you have the door approximately waist high it should stay put. Neither raising nor closing.

Jan 11, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman garage door opener 1/2 hp will not open door


It sounds like your chain is out of sync with the limit switches. Loosen the chain enough so that you can remove it from the sprocket on top of the motor unit. Now run the opener until the sprocket runs counterclockwise and stops. Now with everything attached and the door in the open position replace and tighten the chain. You are now in sync. You may need to tweak the up and down limit controls which are on the side of the motor unit.

Aug 16, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a Craftsman 1/2 HP chain drive garage door opener.


You need to take the cover off the motor unit and watch how the limit switch assembly works. If the door is not stopping when the contacts make then you have a bad logic board.

Jun 14, 2009 | Sears Craftsman LiftMaster Chamberlain...

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