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

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My belt broke on my model 139.655000 sears robust automatic garage door opener. I have misplaced the belt and don't know the length of the belt to buy a replacement. Do you know the belt i need?

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The part number for this belt is STD303310 and is available from Sears for $4.49. I would almost bet you that any good door opener service company in the yellow pages would have one on the shelf.

Posted on Aug 04, 2010

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Posted on Jan 02, 2017

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Craftsmen garage door opener 139.53919 door spring split in two and garage door will not open


Have someone out to fix the spring.
DON"T fix it yourself. These things are very dangerous and can cut off fingers or worse. Just Google replacing garage door springs to read up and the danger replacing these can be.
Have someone who know what they are doing fix it.

Jan 14, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a Sears Craftsman Garage Door Opener Model 139.53919. There was a loud bang that sounded as if something had crashed into it and now the door wont open at all.


Spring broke.
Have someone out to fix it.
These things are dangerous and can cut off fingers.
If you think you can do it yourself - DON'T!

Jan 14, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

The cable broke and I need to replace the cable. Don't know where to purchase the cable.


The chain and cable are an assembly and will be available at Sears or any good door opener service company.

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

1 Answer

Chamberline 1/2 hp belt drive opener that stops opening


It sure sounds like a broken spring. Sometimes the break can be difficult to see. How heavy is the door to lift manually. This will give you a good idea.

Jun 15, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage Door shakes when going up.


It isn't your door opener it is your door. Check the springs and the rollers.

Jun 06, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My Liftmaster garage opener won't go up, only down. It's not bound mechanically. I just replaced the shaft assembly because the old one broke. But since I've done that the garage only goes down, it won't...


BE SURE YOU HAVE THE CHAIN/BELT INSTALLED PROPERLY.
IF THE DRIVE IS AT OR NEAR THE UP LIMIT SWITCH THE DOOR CAN'T GO UP.
LOOSEN & REMOVE THE CHAIN/BELT.
TRY RUNNING THE OPENER TO BOTH LIMITS - JUST TO SEE IF IT WORKS.
RUN THE OPENER TO THE DOWN LIMIT.
MOVE THE TROLLEY TO THE CLOSED POSITION - RECONNECT CHAIN/BELT.
HOPE THIS HELPS

Mar 31, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

The belt broke


what is this model number off. the belt. go to auto supply store

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

1 Answer

Garage door close but motor keeps running


The close setting limit switch needs adjusted. Once it is adjusted it should work just fine.

Dec 24, 2008 | Sears Craftsman LiftMaster Chamberlain...

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