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

3 Answers

Garage door will not open or close

Makes the noise as if opening but does not move, had to pull door down by hand now like i said making the noise, goes through 2 cycles of noise running but does not move

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  • JimB50 Dec 21, 2008

    My door is not opening or closing either. I removed the opener cover. There is a plastic gear, about 2" in diameter that isn't being engaged. There was a lot of plastic in the bottom of the case. I wondered if the shavings from the gear occured over time or just recenlty. Also, the motor is turning in one direction but not the other.

  • car60 Dec 21, 2008

    Sears Craftsman grage door Motor hums but will not open or close door. How do I fix

  • Anonymous Dec 22, 2008

    I have the 1/2 HP craftsman garage door opener model 139.53962SRT.

    Door will close then reverse Itself in other words won't stay closed.Tried adjusting the Limit switch now the motor runs put the chain won't move.

    I tried moving the nylon Limit screws back to there original position no help. Any suggestions The unit is 8 years old maybe time to replace It ?

  • bluemom03 Dec 22, 2008

    We had a big snow and the safety feature would make the door open once it reached the bottom. I cleared all the snow away and even checked the black sensors on ground. I had to use the red cord to open and close it. Now when I push the garage door opener it makes the sound like it is closing/opening but the door doesn't move. I pushed the square button on back of the unit but nothing happened. Help!!!! My home is only three years old.

  • BANSHEE15108 Dec 26, 2008


  • chrishall8 Jan 01, 2009

    Just like you said. The opener has electricity, and it struggles, but it cannot lift the door. I adjusted the switch to maximum power, but still no activity.

  • Anonymous Jan 04, 2009


  • w0lhk May 11, 2010

    Prior to the door not staying closed, I had another problem the garage door when closing would stop and return to open. I adjusted the Force control and that did Fix this problem.That was two weeks ago.Now this current problem !




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I had the same problem, mine was just the white Sprocket assembly, it stands straight up, there is another one which is the Worm gear, mine was fine. I read on some other post, when you take off the panel, and if you see a lot of white dust (shredded white plastic) then its the gear. Went to Sears warehouse, had the part in stock and replaced it myself. Had to just unbolt the Sprocket assembly from inside (3 bolts), pull out from the top, a little hassel, but got it done. Follow the instructions and you will be fine. Remember after greasing up the sprocket like it says too, take the time to use some silcone spray on the springs and rollers, a lot of people forget to do this, even me...

Posted on Jan 03, 2009

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It sounds like the nylon gear attached to the motor has broken, this is actually a very common problem with these openers. Take the receipt into a sears and they should give you the nylon gear, it does look like plastic, a lot cheaper to manufacture, but the cold weather and repetitious opening and closing the motor does really wears on it.

Posted on Dec 23, 2008

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After replacing gears the door close and then opens. Have adjusted several times still won't stay closed. Any suggestions?

Posted on Jan 15, 2009

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Related Questions:

1 Answer

Garage door closes almost all the way and then returns to open. Repeated tries will close door. Replaced both sensors, does same thing.

most garage door openers sense if the door hits something while closing. A sticky track can make the door opener reverse if door doesn't ride on the track smoothly. you may need to grease the track or move door by hand feeling for hard movement.

Dec 20, 2017 | Building Materials

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Linear garage door opens and closes when close to unit about 10 '

when the door stops moving when going down, pull the emergency release handle on the door and then push the door closed by hand. Once it's closed push the emergency handle back so it engages the chain. Open the door and close it a few times to make sure it closes all the way with the motor.

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My Lift Master garage door will not close. It makes the closing noise but the door does not slide down. Whcan I talk to to fix this?

Sounds like you have a chain drive garage door opener and you hear a humming sound when you push the wall console. The motor is running but the chain does not move. You need to replace the gear & sprocket assembly.

Jul 06, 2014 | liftmaster Lift Master 377LM 376LM 315 MHz...

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Sears garage door opener model 139.53919

The torsion springs might need adjustment.

Pull emergency release, and manually lift door to half-open position.

When you release the door, it should stay in place.
If it almost "slams" down, the springs are not doing their job to "balance" the weight of the door itself.
The opener isn't designed to overcome the weight of the unsupported (no spring assist) door.

Over time, the springs take a "set", and might need a readjustment
The springs are under tremendous pressure loading, and can even kill someone if they do not know what they are doing!

Feb 04, 2014 | Building Materials

1 Answer

Can't reattach the door to the trolley and grinding noise, won't move

Pull straight down on the rope and release. Then you should be able to run the opener and the two halves of the trolley will click together. Sometimes you need move the door by hand to get this done. The grinding noise is most likely the drive gear stripping. Remove the cover from the motor unit and it should be obvious.

Oct 04, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Chamberlain Garage - Used Release to open garage

To make sure the trolley will engage properly pull straight down on the rope and release. Then you can either run the opener or move the door by hand. One way or the other it should connect for you.

Jun 20, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

After power failure makes noise but will not open or close

make sure that the troley is engaged with the garage door first

Jan 02, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage opener/ brand garage master 1/3 HP

trolley is not attatced to the chain, grab that red rope that is hanging down and give it a ****. run the door up until it re-locks onto they trolley

Mar 22, 2008 | Sears Craftsman LiftMaster Chamberlain...

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