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

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Door will not open with or without motor

My craftsman door will not open it will not open manually when you release motor it does not disconnect and the plastic piece by the arm looks like a pin is missing. and in the track a small black piece travels up and down the track without the arm.

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  • 18 Answers

It sounds like that missing pin is your problem, the trolley attached to the arm with the pin. Its hard to diagnose, but call in a Door Opener guy and he can probably fix it in a few seconds for free. Otherwise, try and find the pin or something like it to fix the arm in place and see if you can MANUALLY operate the door that way. BTW, Disconnect from power before you try and experiment.

Posted on Feb 19, 2009

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I have no access to my garage and the handle to open it manually is not installed. the keypad and openers need to be reprogrammed but we have no access to the motor unit inside the garage. We are totally...


It is not fixable without access to the motor unit. There is a way to open the door but it involves drilling a hold and using a long tool to reach the manual release. A door opener technician can do this job.

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

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I just installed a new 'rack' to my Craftsman Garage door opener on the screw drive rail system. It now goes up and won't go down. How do I adjust the up / down limits to get it going?


You will need to release the door from the opener and then open the door manually and make a mark on the t-rail where the trolley is. Then remove the t-rail from the motor unit and manually run the rack to the mark on the t-rail. Now run the motor until it runs and stops in the up position. Reassemble all the pieces. This will get everything back into sync.

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

3 Answers

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

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

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My garage door opener only opens the door 1-2 feet high and then stops. What could be the problem?


My guess is that you have a broken spring. Look at the springs and see if you can see a gap in one of them. If you pull the release and you can't open the door without struggling then you definately have something wrong. The opener is trying to heft weight that it is not designed for and is stopping itself to prevent damage.

Oct 21, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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Hello, You should have a cord in the middle if the track up high to release the door from the motor bracket. i would release it and confirm that the door will raise and lower with you pushing it. Then if the door feels free I would lower the door manual and go over the the inside button and press it to see if the motor will run without the pressure of the door. This will at least pinpoint where your problem is. The door itself could just be in a bind within the tracks so by releasing it from the motor that might free it up.

I hope this helps you and have a great weekend.

Jun 07, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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Unplug the unit and remove the cover, usually eight screws, if you see a lot of white dust in the cover check the nylon drive/worm gear, they will need to be replaced.

Apr 10, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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with the door down, disconnect with the emergency release, see if the motor operates
with no load...if the the track moves you probably have something obstructing the door
ie; a broken spring, door locks, etc ... the chain should be adjusted for just a little
**** mid way down the rail (1/4") if it still doesn't move ... call sears.

Mar 14, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Sears Craftsman 1/2hp Garage Door Opener


Thats one of the symptoms of a lightning strike or a power surge. Without actually being there I would suggest replacing the back-board. But as with lightning strikes and power surges sometimes other electronic components could have been damaged as well.

Jun 29, 2008 | Sears Craftsman LiftMaster Chamberlain...

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