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

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Unable to allign inner and outer trolley on a Craftsman garage door opener

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  • mcorp Mar 05, 2009

    I tried to open door and motor began to hum, however door did not open...I pulled the manual release and it now seems that the inner trolley and outer trolley have seperated and I can not line them back up to engage.

  • Vince Heuser May 11, 2010

    I need more info to assist

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  • 112 Answers

You probably have a stripped gear. Take the cover off the opener and the bottom will be filled with white shavings and the gear will be missing teeth. You can repair with a liftmaster gear and sprocket kit.

Posted on Mar 06, 2009

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1 Answer

Garage door opener trolley keeps shearing off. Had it replaced a year ago, and I noticed that it is making a grinding noise and I can see it is halfway sheared off again.


issue with counterbalance springs. when you release trolley, door should balance at half way open. if i rises all the way on its own, or falls closed, then the springs are an issue and motor and trolley are working very hard in one direction or the other.

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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.


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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.

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

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The inner and outer trolley will not reconnect


If the rope is pulled down and back toward the motor unit the trolley latches in the released position. To unlatch the trolley pull straight down on the rope and release. The two halves should now click together.

Feb 28, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Door can be opened manually when the trolley has


You can adjust the length of the arm between the trolley and door so that it is in a vertical position when the door is closed. This will prevent your problem.

Oct 03, 2009 | 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

Garage door opens 1 foot, then stops.


It sure sounds like you have a broken door spring. While you are at it remove the cover and take a good look at the drive gear. It is white nylon and is just in front of the motor. Might be stripped and unable to take the weight of the door.

Jun 24, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Opening theGarage door manually


two problems. why aren't inner and outter trolley connecting. did you leave rope is disconnect position. Second problem is door springs do not seem balanced. you should be able to lift door halve way up and let go. it should pretty much stay there; go up or down slowly ok. fly up or crash down; need to adjust springs/cables or maybe wrong springs.

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

1 Answer

Sears garage door opener, chain adjustment


Loosen the inner nut on the trolley. (That is the lock nut). Then tighten the outer nut on the trolley to increase tension. The outer nut on the trolley is closest to the garage door. The chain tension should be 1/2 inch off the rail at midspan. (The chain is fastened to a threaded bolt on to the trolley. The threaded bolt has an inner and outer nut). Hope this helps.

Dec 24, 2008 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman garage door opener


IF THE BELT IS MOVING - THE DOOR HAS BEEN RELEASED FROM THE TROLLEY.

PULL THE RED ROPE AND MAKE SURE IT LOCKS ONTO THE INNER TROLLEY.

Oct 18, 2008 | Sears Craftsman LiftMaster Chamberlain...

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