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

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Craftsman Liftmaster Plastic gear replaced about a month ago, door was working fine, one morning door only went half way up, had to manually push door up, now that is the only way door will open or shut. Also the door seems to be very heavy and drops really hard when closing manually.

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Check your door springs. One of them is most likely broken and is what caused your drive gear to strip in the beginning.

Posted on Jun 18, 2009

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With my door closed, i push door button to open and the chain and opener continues inthe closing mode. any help?


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Jan 10, 2016 | Sears Craftsman LiftMaster Chamberlain...

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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...

1 Answer

Liftmaster 1/2 HP Garage Door opener won't open or close. Has been working fine until I pulled out this morning. The door will move freely if I disengage from opener. Went up ladder to see chain not...


The shaft on these garage door motors are not direct drive systems. You'll have to open up the box to see what the actual problem is. I have had stuff like this happen where a gear just slipped out of place.

http://www.aaadooropeners.com/?gclid=CLH3wt628p8CFVZS2goduwSLYQ

Here is a link for a parts supplier. I don't know your model but it looks like most of the Liftmaster worm screw gears and drive gears are plastic so it's possible that one of them has cracked.

Feb 14, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

I have a old Liftmaster Garage Door Opener. This morning when I pushed the button the motor went on but the chain didn't move to open the door. What's the story?


If you remove the cover I'm sure you will find the drive gear is stripped. It is a white nylon gear just in front of the motor. It is available at any good door opener service company and comes with instructions.

Jan 05, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman Garage Door Opener - Gears need to be fixed


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

Liftmaster 1/2hp problem with shredding gear shift really fast


DOES THE DOOR WORK SMOOTHLY AND EASILY MANUALLY??
IF NOT THAT WILL CHEW UP YOUR GEARS.
IF THE DOOR WORKS WELL MANUALLY I AM GUESSING YOU ONLY REPLACED THE EASY GEAR.
YOU NEED TO REPLACE *BOTH* GEARS - FOLLOW THE INSTUCTIONS COMPLETELY. THE SECOND ONE IS HARD TO CHANGE BUT IF YOU DON'T THE ROUGH SURFACE OF THE HARDER WORN GEAR WILL CHEW AT THE NEW GEAR AND ..... WELL YOU HAVE SEEN THE RESULTS.
HOPE THIS HELPS


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

1 Answer

Opener goes 12"+/- and then returns


havent heard any of yu say you adjusted the down force.

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

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