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

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After I open my garage door, the next time I push the button the chain goes in the wrong direction past the plastic actuator and the slider comes off the bracket and drops??

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Could you post the model number and manufacturer of your opener?

Posted on Jun 17, 2009


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As you push remote door travels a shot distance stops,push button and travels short distance again and again. What is wrong?

Most common failure is internal plastic gear. If we assume that this is the failure i would suggest disconnect the travel engage latch to the non engaged position. Cycle the door and observe if there comes a time that the motor is humming and the chain or latch is not moving. Other than reversing for just a brief moment at the end of travel at no time should the motor hum as turning and the latch feature not move.

What I suspect is happening in the down direction door wants to close and as the gear rotates the gear slips . This repair is not so difficult for the DIY with some mechanic skills and tools. Lots of u-tube showing you how, Parts are available. Confirm the right part for your specific model. Purchase the gear and shaft as an assembly if you not sure about the difficulty. Part prices are all over the map. Shop around. You can buy just the gear a little more difficult to replace.


His 15 minute estimate may be a little optimistic.
Craftsman LiftMaster Garage Door Opener Won Open or Close Fix the Stripped...

Jan 10, 2016 | Building Materials

1 Answer

My garage door does not want to close but it will open with no trouble I reset it but it still does the same thing the one I have is 1/2 HP model #139.54985 can you help me?

sounds like a relay malfunctioning or mother board issue----that's if you haven't damaged any sensors or had lightning strike----usually you push the button to start it going in the up or down then you push the button to stop it then push it again to go in the opposite direction----I don't know how your operating this with a remote or on site switch so it's hard to fathom what's wrong with limited info----it's like trying to cut hair over a telephone

Mar 01, 2015 | Craftsman 1/2 HP CHain Drive Garage Door...

1 Answer

Fix my Craftsman 139.53973SRT garage door opener? When the button is pushed, the motor runs but the chain doesn't move. When I get on a ladder and try to pull the chain (help it along) it will move o

Pull the cord that releases the traveler from the door and manually raise and lower the door to make sure the door isn't binding anywhere. Then actuate the opener and watch to ensure the traveler moves along the rail. If this is all successful, you may need to adjust the sensitivity of the opener.
Good luck!

Nov 26, 2014 | Building Materials

1 Answer


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.

Mar 28, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Door will not move up or down,the drive motor just hums.

On the inside of the motor box, check to make sure the chain has not come off the gear.

Apr 05, 2010 | Chamberlain Powerdrive PD422D 1/2 HP...

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

Press button to open garage door, doesnt work

may have stripped gears. take off light panel and look inside. white powder. bad gears. repair if yu are handy, if not, buy new unit.

Jan 19, 2009 | Sears Craftsman LiftMaster Chamberlain...

5 Answers

Chamberlan 1/2 hp security + not working

sounds like it is out of you have a manual on this model

May 19, 2008 | Chamberlain Powerdrive PD422D 1/2 HP...

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