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

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My garage door works intermitedly. At times it will go all the way up, sometimes it goes half way, sometimes only a foot or two. Can this be fixed?

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Check the door springs to make sure one of them isn't broken. Next remove the cover from the motor unit and check the drive gear. It is white nylon and may be going bad. It will be obvious if it is.

Posted on May 25, 2011

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Posted on Jan 02, 2017

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My craftsman 1/2 hp garage door goes up only about


Release the door from the opener and operate the door by hand. Check the weight of the door. If it is heavy check the door springs. One could be broken. Also take another look at the gear you replaced. Did you use the lubricant on the gear? If not the gear will not last.

Mar 02, 2010 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

My older Craftsman garage door opener comes down about 6" & then goes back up. I just replaced all the rollers o& the opener worked fine. Then I tightened the chain on the opener & it worked ok...


If the main light flashes 10 times when the door goes back up it is a door sensor problem. You chain should sag just a little. If you tighten it too much it will click as it goes over the sprocket. You can increase the down force which is an adjustment near where all those white wires go. A 1/4 turn should be enough. Release the door from the opener and operate it by hand. It should move freely and when you have the door approximately waist high it should stay put. Neither raising nor closing.

Jan 11, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Worked great the past 2 years. Now, garage door


Remove the cover and take a look at the drive gear. It is white nylon and is just in front of the motor. Most likely stripped.

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

1 Answer

Door goes up about a foot and stops


The sensors have nothing to do with your door opening. First thing to check are the door springs. One may be broken. Next remove the cover and check the drive gear. It is a white nylon gear just in front of the motor. It may be stripped.

Jun 30, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My garage door bucks like a bronco


You have a door problem. The reason the door is reversing to the open position is because when it bucks the safety senses something wrong. Release the door from the opener and operate it by hand. You should find something.

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

1 Answer

Liftmaster Remote garage door openers work intermittently.


check to see if your ant. is up inside of the cover it's a little black wire that hangs outside of the operator shiould be about 6 inch.

Jun 02, 2009 | liftmaster Chamberlain Garage Door Opener...

1 Answer

Garage door closing


HAVE YOU ADJUSTED THE SENSITIVITY??

ALSO SPRAY THE SPRING WITH A LITTLE WD-40 SOMETIMES THEY BIND AS THE DOOR CLOSES.

Mar 29, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door works sometimes and sometimes it won't


Spray some silicone in the tracks...this should help...it sounds like an alignment problem

I’m happy to assist further over the phone at https://www.6ya.com/expert/robert_aad3edb7dfa380b9

Mar 12, 2009 | Sears Craftsman LiftMaster Chamberlain...

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