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

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The belt broke

Where can i find a replacement model # 31517321

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

Posted on Jan 28, 2009

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I have a Liftmaster Garage door model 3280 and I changed the belt and when I try to open the door it only open about 2 feet from the floor.


Remove the belt and then run the opener until the sprocket on top of the motor runs in the counterclockwise direction and stops. Now with the door in the open position replace the belt. Some adjustments of the up and down limits will be necessary.

Sep 24, 2011 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

I have a Sears Crafstman Garage door wireless opener. Model 139.53615SR . The door hums but nothing happens. The chain doesn't move. The springs on the door broke last year and i replaced both of them....


My plastic gear stripped soon after a spring broke. I think the broken spring put a huge load on the opener that day and ruined the gear. Replacement wasn't too hard. It will be obvious when you remove the cover if the gear is stripped. Here are instructions:
http://tinyurl.com/gearfix
dwdfixya_1.jpg

Dec 19, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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?


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.

Aug 04, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Replace drive belt on garage door opener craftsman. What do I take apart so I can replace belt


On page 10 and 11 of your owners manual it shows how to connect the belt to the trolley. You should be able to reverse these instructions.

Jun 04, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Chain drive gear broke on my mod.1265LM. Nead price, part no., and how to replace? Thanks Dave


The drive gear part number is 41A2817 and the price for the kit is around $25.00. It comes with instructions.

Dec 21, 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...

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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

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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