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

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Liftmaster belt driven door opener made in 1995

I recently had to change the large plastic gear which required me to take the belt off my liftmaster door opener. I replaced the gear and put the belt back on. I adjusted the belt spring back to where it was (I marked it before I took it off). Now the door will not go all the way down or up unless I help it ever so slightly.

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You need to adjust the limit settings. There are two white screws on the side of the opener. One adjusts the down limit and the other adjusts the up limit. One full turn adjusts the door approx two inches, so turn the screws in small increments and see how much more to adjust.

Posted on Mar 06, 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?

Shop for sears craftsman liftmaste... on Google

Garage Door Opener Gear...
Sears Parts D... Liftmaster 41C4220A Ge...
Preferred Do... Chamberlain/l... Sprocket, Gea...
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    Liftmaster Gear And Sprocket Kit 41c4220a Chamberlain ...

    Searsmore info. + -. Chamberlain LiftMaster 41C4220A Gear & Sprocket Assembly Kit. $31.40 ... Chamberlain Sears Craftsman Liftmaster 41A2817 Gear Kit. $27.65 ...

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

1 Answer

41a4315 7a parts

The gears are all the same with the exception of the belt drive units that have a different top sprocket , you can find the part # on the internet simply by putting in the model # of your opener and identifying whether you have a belt drive or chain drive machine , you can also find the part on Ebay by putting sears/liftmaster or chamberlain sprocket gear assembly in the description ....All 3 of those models are made by Liftmaster being the main Brand ! Liftmaster manufactures the sears craftsmen for Sears and also goes under the chamberlain brand name that k mart and Home depot and Lowes sells ! Liftmaster is the worlds largest manufacturer of garage door openers and all 3 machines are interchangeable with their parts ! Hope this helps you Sincerely Glenn

Sep 01, 2014 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Motor runs but door won't open. checked chain, seems to be ok


The problem is not the chain, it is the plastic gear in the unit of the liftmaster Garage Door 1/2 Hp.The plastic gear is not engaging, although it sounds like it is working.

You will have to replace it with a new one, then the liftmaster Garage Door 1/2 Hp will be able to open up once again.

Once you open and remove the old gear, Be sure to thread the screws in all the parts before you install them. Pre-threading them once would really help. Secondly, label the wires on the back of the opener before lowering it to the ladder, so you can put them back in their proper place.

Hope this was helpful.

Jun 27, 2011 | liftmaster Garage Door 1/2 Hp

2 Answers

Sears Craftsman LiftMaster Chamberlain Garage 13953664SRT worm gear stripped who do I replace it

If you buy the gear kit part number 41A2817 it comes with instructions. It is available at any good door opener service company.

Jan 11, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a Liftmaster formula1 garage door operator, belt drive. It just ate the main plastic drive gear. This operator has been in operation for 15 years with no problems. Any ideas?



Unplug the unit - take of the cover - you will find white shavings inside - these confirm the Get the gear AND sprocket kit.


Oct 17, 2010 | liftmaster Chamberlain Garage Door Opener...

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.

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

Need to change plastic 3" diameter gear that is driven by the worm drive gear

The part number for the gear kit is 41A2817. It comes with instructions and is available at any good door opener service company.

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

1 Answer

Recently changed gear and now door will not close

The opener clicking 10 times when the door reverses is a door sensor problem. You may have knocked a wire loose on the back of the motor unit or accidently bumped one of your door sensors. Make sure the small light on each sensor is lit and not flickering. Tweak them a bit to get them properly pointed at one another.

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

2 Answers

I have Chamberlain LiftMaster 1255R garage door opener. The electric eye does not lit and the opener unit flashes 5 times and then off. Do you know what the problem may be?

My garagedoor opener is not working.
I open the box and found the plastic gear worn out.
I have Liftmaster 1255R.
Do I need to replace the whole box or replace the worn gears?

Jul 08, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Chamberlain Liftmaster 1246R won't open/close

if youcan hear the motor turning when you hit the remote or wall button the plastic gear in the oprator has been ripped and if you take the cover off you will see all of the whote plastic dust that has come from the gear being shreded. You can replace this gear. you do not have to buy a new operator. it is very easy to replace this gear. I can't tell you were to buy one because I buy all my stuff from a dealer.

Jun 09, 2009 | liftmaster Chamberlain Garage Door Opener...

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