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

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Door won't open or close

I just installed a new sprocket for an older Craftsmen Garage door opener. The installation went well, but now I can't adjust the door so it can open or close. It just goes for around a foot, and stops (both ways). All adjustments that I have made don't seem to work.

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  • kwangchan Jan 03, 2009

    I got liftmaster 1/4hp, chain drive, model 1240

    I changed the new sprocket gear set. the installation went well but adjustment was hard. please advise me.

    when I push the button, the door goes down 2' then goes up 2' then stops. It moves and stops well before it comes into contact with the limit switches. I checked security sensors and I tried to adjust force and limit but I couldn't find the problems

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Check the connection on your limit assy. Many times people forget to reconnect this.

Posted on Jan 03, 2009

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1 Answer

Broken sprocket coupler


Could be. Yet you may only need to adjust the springs and not replace them.. In case you have roll up/ sectional garage door, it should be quite easy you need to release the traveler from the rail so you can open and close the door manually/by hand then, while open the door on the knee level leave the door. If it falls down the springs need adjustment.
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If the door falls/ closes down not enough tension on springs, if door opens up too much tension on springs. If door acts funny.like close when close to the floor and jump up when its futher more open, it means that you don't have the matching springs for the weight of your garage.

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Does it make a noise? Did it run before you changed the springs? Did you replace springs on opener or on the door? What adjustment screws are you looking for? Do you think they went out of adjustment when you changed the springs?

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HI, AFTER REPLACEING PLASTIC GEARS IN SAERS GARAGE DOOR O[ENER, OPENER WILL NOT GO THROUGH COMPLETE CYCLE. WHEN BUTTON PUSHED TO OPEN, OPENER GOES INTO CLOSE CYCLE AND HITS STOP BOLT. ATTEMPTED TO ADJUST...


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

Craftsman 1/3 hp garage door opener I bought a new one - my father installed it and the door will open half way - that is it.. then when you go to close it - it closes and then opens half way...


I hate to say this but it sounds like your father did not follow the instructions when he installed the opener. Try following these instructions.

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.



Nov 25, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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It sounds like your chain needs adjusting. Try this.

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 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

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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

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You can fix this by loosening the chain enough that you can lift it off the sprocket. Then run the opener until the sprocket turns counterclockwise and stops. Now with the door in the open position replace the chain. This will get the chain running the right direction. You will have to adjust the open and close limits along with the force adjustments but that will all be covered in your owners manual.

May 27, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opener (chain) motor runs in reverse. Trolley slides forward trying to close door, even though it is closed, instead of sliding toward motor to open door. Happened out of the blue - was


Loosen the chain enough that you can remove it from the sprocket. Run the opener until the sprocket turns counterclockwise and stops. With the door in the open position replace the chain. You will probably need to adjust your open and close limits per your owners manual.

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

1 Answer

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do not understand what you mean by can't reprogram openers, How old, Dip switches inside. Security plus. Need more info.

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