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

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The motor is running but the chain isn't moving. Any suggestions?

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Remove the cover from the motor unit and check the drive gear. I'm sure you will find what looks like white sawdust all over and the gear will be stripped. The part number is 41A2817 and is available from Sears or any good door opener service company. It comes with instructions.

Posted on Aug 07, 2010

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Posted on Jan 02, 2017

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If the motor runs and the chain does not then you have stripped the gears and will need to replace them. If the motor runs, the chain moves but the door does not move then the trolley is not attached or needs to be replaced. Thanks BB

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1 Answer

Garage door chain isnt engaged. motor is running


SOUNDS LIKE A BAD GEAR KIT

IF THE CHAIN MOVES BUT THE DOOR DOESN'T IT WOULD BE THE TROLLEY RELEASE. IF THE CHAIN DOESN'T MOVE IT WOULD BE THE GEAR KIT.
HOPE THIS HELPS

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1 Answer

Motor runs but chain does not move?


Check the chain drive sprocket to see if it moves when the motor runs. If not, there may be a sheared key between the shaft and sprocket or the teeth on the sprocket are badly worn off. Hope this helps!

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Just got MCC4516F chainsaw.Used it for 30 mins. Stopped working. Chain brake does not engage or release. Chain does not move. Motor runs but will not engage to make blade move. Seems like chain brake...


You have obviously jammed or broken the chain on the inside of the motor. Take it to be repaired, or try reparing yourself by opening up the engine casing yourself.

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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.

Apr 20, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Craftsman Garage Door Opener Won't Open


When mine did this, it was because the nylon gears that drive the chain had stripped. My wife had to live without the opener for a week or more, but I was able to find a new gear kit online and replace the damaged gears. It wasn't difficult.
The other option is to buy a new opener.

Dec 03, 2008 | Sears Craftsman LiftMaster Chamberlain...

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