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

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My mother in laws garage door opener runs but the sprocket is not moving is there a shear pin or something that could be broken?

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The drive gear is stripped. It is a white nylon gear and is just in front of the motor.

Posted on Dec 31, 2010

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1 Answer

What is broken on my garage door opener? chain moves fine when in manual mode but grinds/clicks when door is engaged


to tell if you have a stripped gear. take the cover off you should see a lot of white power in it. depending on the age of your opener buy or have both the gear and sprocket replaced.

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3) The front chain drive sprocket SHAFT has sheared. (basically, meaning that the shaft has broken into two parts as it couldn't handle the drive power (torque) being delivered through it to the chain drive) With the motor on, listen for grinding noises internally
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1 Answer

Sears Garage door opener #41A3625, chain sprocket hanging on the bar. I went to open the door this morning it was frozen and it didnt open. i went out to see why and i saw the chain hanginging, and the...


It sounds like the shaft for the sprocket and drive gear has broken or been sheared off. The part number for this assembly is 41C4220A and is available from Sears parts or any good local door opener company. It comes with instructions if you want to do it yourself.

Jan 03, 2012 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opener: motor runs but chain doesnt move.


Depends on your mechanical ability. The drive gear is stripped. The part number is 41A2817 and is available at any door opener service company. It comes with instructions.

Jan 31, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftman door opener brand new wont work?


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

Jul 04, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman opener motor works, but chain does not move.


If the motor is working but the chain does not move you must remove the cover on the motor and check to see that the chain is on the sprocket. If the chain is on the sprocket and the sprocket is not moving but the motor shaft is moving then the sprocket must be retightened onto the motor shaft.

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