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

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Garage door went up, now won't go down

My Sears garage door went up and traveled over the limit. now it won't go down. just sits there and buzzes.

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  • student53 May 11, 2010

    Do you have the expertise to check the functionality of the limit switches. (It sounds like the upper limit switch is not registering.)

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  • 244 Answers

Take out bolt from rail that trolley is stuck against. try it now. happens sometimes

Posted on Jan 16, 2009

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Press the button for the garage door to go down and it will only travel a couple of inches and shakes. Unlatch the door and press the button and the door will catch the latch on the way down and close. ...


Most likely cause is the load limiters. Firstly, the door needs to work perfectly, when worked manually. No stops or restrictions through entire movement. Then reset the load limiters to spec and test again. Up limit is not extremely critical, but the close load limit can save lives and prevent vehicle damage.

Jul 23, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opened fine but now when I try to close it, all I hear is a buzzing sound for 3 sec., light comes on but door won't go down.


Your trolley may be jammed against the bolt just in front of the motor unit. If so, loosen the chain enough to relieve the strain on the chain and then run the opener until the door is closed. 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.

Jul 18, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman garage door opener #139.53985 The door reverses in the fully closed position. I can not decrease the down travel limit by turning the adjustment screw clockwise. Please comment regarding a...


TAKE OFF THE COVER & SEE IF THE LIMITS ARE WORKING CORRECTLY.

IF THEY ARE AND THERE IS JUST NOT ENOUGH TRAVEL YOU MAY NEED TO REMOVE THE CHAIN AND REINSTALL IT 4 OR 5 LINKS OVER THIS WILL INCREASE THE LIMIT.

HOPE THIS HELPS

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

1 Answer

Garage door bounces back open


It sounds like your door is traveling too far in the down direction. Locate the 'down limit' control on the side of the motor unit and turn this control in the opposite direction of the arrow printed on the cover. Some tweaking may be necessary.

May 13, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Our garage door travels all the way down and then reverses on it's own. What adjustment do I need to make with the tension or travel and how do I do it? We've fixed it before, but I can't find the manual.


If the door reverses when it hits the garage floor it is traveling too far. On the side of the motor unit you will find the 'down limit' control. Turn this control in the opposite direction of the arrow printed on the cover. Some tweaking will probably be necessary.

Apr 18, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My garage door seems to want to travel too far up and down. The travel adjustment screws don't seem to do anything (almost like they're at the end of their adjustment range). Door height and all is...


If you haven't you should remove the cover and watch the limit switch assembly. If it is making contact when it should but the door keeps traveling you have a bad logic board.

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

3 Answers

Can the travel limits on a Chamberlain security+ be reset?


If you are at the back of the operator looking toward the door the limit adjustment should be on the left hand side.
The adjustment closest to the door is the down limit turn that 3 turns clockwise. The adjustment screw furthest from the door is the up limit turn this screw 3 turns counterclockwise. That should get you close to factor settings. If this does not work; remove the cover on the operator sometimes the limit assy. come apart.

Oct 01, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My garage door opener travels settings out of wack ??


The 'up and down limit' adjustments are on the side of the motor unit.

Aug 28, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My door opener is new, Chamberlain, mod cg40cd, the drive will hit both limits. will not let me set the up and down limits, doesn't seem to matter whether I set the up and down to max either way??????


THE TRAVEL ADJUSTMENT IS ON THE SIDE.
YOU MAY BE ADJUSTING THE SENSITIVITY (TRAVEL LIMIT HAS NO MAX ADJ.)
BE SURE TO RESET THE SENSITIVITY ADJUSTMENT TO ABOUT 1/4

HOPE THIS HELPS

Mar 26, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My garage door opener want work


Check to see if the traveler is against the bolt on the rail.

If it is, you need to loosen the chain and adjust the up limit to keep it from reaching the bolt.

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

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