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

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

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

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  • Anonymous Sep 20, 2008

    I have the same problem!

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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.

Posted on Sep 25, 2008

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SOURCE: Garage door drive stuck un up position

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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1 Answer

I have Chamberlain 1160 Lift-Master farage opener. Currently the trolley stuck in the upped position agains the bolt and does not go back. When I try to close the door, the motor is humming twice, then...


Loosen the chain to remove the strain from it and run the motor until the door closes. While the door is closed locate the 'up limit' on the side of the motor unit and turn this control 2 complete turns in the opposite direction of the arrow printed on the cover. Now you can tighten the chain.

Oct 25, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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Don't tighten the chain. It sounds like you have either a broken door spring or the drive gear in the motor unit is going bad. Release the opener from the door and operate it by hand. It should be easy enough to raise that your wife can do it with no problems and it should stay put when released about waist to shoulder high.

Jul 27, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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.

Apr 06, 2010 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

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Is the door stuck in the open position? If so the trolley is probably jammed against the bolt just in front of the motor unit. Loosen the chain enough to free the trolley and then run the opener until the door is closed. While the door is closed locate the 'up limit' on the side of the motor unit and turn this control 2 complete turns in the opposite direction of the arrow printed on the cover. Tighten the chain.

Apr 03, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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...

1 Answer

When I push the button to open my garage door, the


Remove the cover and take a look at the drive gear. It is white nylon and is just in front of the motor. It is probably stripped. It is a good time to release the door from the opener and try raising it by hand. Your door springs may be weak or possibly broken.

Oct 15, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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.

Sep 03, 2009 | Sears Craftsman LiftMaster Chamberlain...

3 Answers

Garage door drive stuck un up position


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.

Jan 23, 2008 | Sears Craftsman LiftMaster Chamberlain...

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