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

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Grage door open

When i open a grage door but grage door not open. motor rooling properly but chain not push the door.

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Reconnect trolley

Posted on Jan 15, 2009

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1 Answer

Craftsman 1/2 hp garage door opener motor just buzzes when the remote is pushed no movement


Check to see if the trolley is jammed against the bolt just in front of the motor unit. If so loosen the chain enough to remove the tension of the trolley. Now run the motor until the door closes. While the door is closed, locate the 'up limit' control on the side of the motor unit. Turn this control 2 full turns in the opposite direction of the arrow printed on the cover. Tighten the chain.


Jan 21, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a chamberlain 5580 operator it sounds like motors jambed


If the motor is stuck in the open position the trolley may be jammed against a bolt just in front of the motor unit. If so, loosen the chain enough that the tension is taken off the trolley and then run the opener until the door closes. While the door is closed locate the 'up limit' control on the side of the motor unit. Turn this control in the opposite direction of the arrow printed on the cover and then tighten the chain.

If the door is not in the open position you may have a bad start capacitor.

Jun 17, 2010 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Liftmaster Garage Door Won't Close


Sounds like maybe the door traveled too far and the trolley has jammed against the bolt just in front of the motor. If so, loosen the chain enough to take the tension off the chain and then run the opener until the door closes. While the door is closed locate the 'up limit' control on the side of the motor unit and turn it 2 full turns in the opposite direction of the arrow printed on the cover. Tighten the chain.

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

1 Answer

Garage door does not open or close


You have a stripped drive gear. Remove the cover from the motor unit and you will find white sawdust all over. The part number for the gear kit is 41A2817 and is available at any good door opener service company. It comes with instructions.

Feb 12, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door doesn't open and close properly


Loosen the chain enough so that you can remove it from the sprocket above the motor unit. With the door closed run the motor until the sprocket turns clockwise and stops. With everything attached replace and tighten the chain. Some adjusting of the up and down limits will probably be required.


Jan 07, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opener closes when closed


Try this: Loosen the chain enough that you can remove it from the sprocket above the motor. Now run the opener until the sprocket turns in the clockwise direction and stops. Reconnect the chain. This will get everything in sync and you will have to tweak the 'up and down limits' a bit to get it just right.

Oct 11, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Door won't close unless i push button on wall several times


You probably have a stripped gear inside opener. Take off cover and the bottom will be filled with white flakes from stripped gear

Jan 23, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

How is the chain supposed to be aligned


sync the motor. the gear kit tells you how. get motor up and position trolley near motor, assuming you left chain/cable attached to trolley). Get motor up by running motor and then pushing button again. if motor reverse, let it run and it will stop in up position.

Jan 17, 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...

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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