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

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Motor sounds like it is running but sprocket doesnt move

I have the 1/2 HORSE POWER CHAIN DRIVE opener, the motor sounds like it's running, but the chain is not moving.

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How old is unit. sounds like gears are shot, takes $25 of parts and 2-3 hours to fix if you are handy. Take cover off, If it has white powder (Not ****), gears are shot.

Posted on Jan 15, 2009

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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.

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1 Answer

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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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Garage door opener motor runs, but the chain drive doesnt turn


If the chain is not moving and the motor is – you need a gear kit.

Unplug the unit - take of the cover – you will find white shavings inside – these confirm the diagnosis. .

Get the gear AND sprocket kit.

It’s a good DIY project but you MUST VERY CAREFULLY Follow the instructions step by step.

HOPE THIS HELPS

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1 Answer

Motor works but does not move chain on half horse sears


Clutch? need more info.. wall mount or overhead? If it's wall mounted it could be the clutch, I don't think overheads have a clutch though. The first thing I'd do is get on a ladder and see if the chain is still attached to the sprocket... good luck

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1 Answer

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you will have to find were the chain is binding look around the drive sprocket and check the chain to see if it is tight at the bottom or top this will tell you were to start looking for the problem.

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