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

3 Answers

Garage door drive stuck un up position

The Craftsman door is chain drive and stuck in up position. Pushing the button to close door does not move at all. There is a humming sound like the motor is locked up. The eyes are properly lined up and there are no obstructions in the beam path. I manually released the door from the lift chain and retried the power switch. The result was the same. It sounds like the motor is locked up. KenSouthBend

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  • jake63 Jan 24, 2008

    same problem...Trolley jammed into stop bolt. limit switch failed?

  • mussbus Feb 01, 2008

    I am having the same problem - except the chain is stuck and my door will only go up 3/4 of the way...not enough to get my van out! Any suggestions would be appreciated. Yes, we're having a cold snap, but this is the first time we've had this happen to us.

  • Bulldog6670 Feb 01, 2008

    I have exactly the same problem, and it is not a sudden drop in temperature. I also released the door with same outcome. The door operates quite quite smoothly when closed by hand. One anomaly was the chain is sagging quite a bit.



    Any suggestions would be welcome.

  • BECY May 07, 2008

    Door stuck half way open makes a clicking noise when the open /close button is pushed. Stuck in the locked position.

  • pudsy Jul 04, 2008

    I am having the same problem - except the chain is stuck and my door will only go up 3/4 of the way...not enough to get my van out! Any suggestions would be appreciated.

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I found the chain extremely tight on the sproket. The mechanism had stalled hard against the stop bolt. I loosened the chain tensioner and the motor operated properly. Reset the limit adjustment so the mechanism stops a couple of inches from the stop bolt. Door is working fine now.

Posted on Feb 02, 2008

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I just experienced the same problem. I removed the back cover and found the teeth on the drive gear completely worn down. I have not order parts since I just discovered the problem, but it appears gear & sprocket assembly kits are available from several different vendors from $15 - $40.

Posted on Feb 05, 2008

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Before I suggest a solution, are you in an area where you get sudden cold temperatures? I've had the identical problem and it's nothing to worry about.

Posted on Jan 24, 2008

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1 Answer

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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If the main light flashes 10 times and the door reverses to the open position it is a door sensor problem. Make sure the lights on the sensors are both on and not flickering. Tweak them if necessary. If you cannot get both lights to come on you have bad sensors or the wiring to them.

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I am having a problem with my garage door opener. It just clicks. Its a craftsman opener. The lights are on but it does not move when the button is pressed.


If your door is stuck in the open position it is probably because the trolley is jammed against the bolt just in front of the motor. If so, loosen the chain enough to release the pressure on the trolley and run the opener until the door is closed. With the door closed locate the 'up limit' control 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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My 20 yr. old Craftsman 1/2HP chain drive GDO (139.18590) will click and hum for a second but the door doesn't move when I press a remote or wall console. The door moves freely manually and I checked the...


If your door is stuck in the open position the trolley is most likely jammed against the bolt just in front of the motor unit. You should be able to loosen the chain enough that it releases the pressure on the trolley and then close the door. While the door is closed, locate the 'up limit' control which is on the side of the motor unit. Turn this control 2 full turns in the opposite direction of the arrow printed on the cover and then tighten the chain.

Feb 21, 2010 | Sears Craftsman LiftMaster Chamberlain...

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I have a Sears Craftsman 1/2 horse garage door opener. When I push the button, I can hear it hum, but the chain won't move and it seems the sprocket is frozen?


If your door is stuck in the open position you will find the trolley is jammed against a bolt just in front of the motor unit. Remove that bolt and run the opener until the door closes. Now locate the 'up limit' control on the side of the motor unit and turn it 2 times in the opposite direction of the arrow printed on the cover. Replace the bolt.

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Garage Door opened but will not close. I opened


I think the trolley has jammed against the bolt just in front of the motor unit. Remove the bolt and then run the door until it is closed. With the door closed locate the 'up limit' control on the side of the motor unit. Turn this 2 turns in the opposite direction of the arrow printed on the cover. Replace the bolt.

Sep 01, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman 1/2HP Door Opener won't stay closed


Loosen the chain and run the opener until the sprocket runs in the counter clockwise direction and stops. Now with the door in the open position replace the chain. This will get everything back into sync but I hope you remembered where all those controls were. You need to put them back in their original positions.

Jun 06, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a craftsman garage door opener and the chain came off trac


YES - YOU ALSO NEED TO BE SURE IT IS IN THE CORRECT POSITION WHEN YOU REINSTALL IT.

MOVE THE TRAVELER / TROLLEY TO THE CLOSED POSITION RUN THE OPENER TO THE CLOSED POSITION. LOOSEN CHAIN AND REINSTALL.

TIGTHEN CHAIN ONLY ENOUGH TO KEEP IT FROM SAGGING BELOW THE RAIL. (TOO TIGHT WILL RUIN THE BUSHINGS ON THE DRIVE).

NOTE; THE BUSHINGS MAY BE BAD THIS WOULD CAUSE THE CHAIN TO COME OFF OR SAG TOO FAR, LOOK FOR EXCESSIVE PLAY IN THE BUSHING UNDER THE CHAIN SPROCKET.

IF IT IS BAD A KIT IS AVAILABLE TO REPAIR.

HOPE THIS HELPS

Mar 22, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Lift-master chain drive garage door stuck at the protection bolt


you will have to find were the chain is binding look around the drive sprocket and check the chain to see if it is tight at the bottom or top this will tell you were to start looking for the problem.

Sep 19, 2008 | Sears Craftsman LiftMaster Chamberlain...

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