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

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Garage door wont open,moto running ,chain not moving

3m ago sevice tech tightend chain for noisy door opening and closing as part of routine maintenance
3 days ago door will open 3rd or a half and after coaxing the remote it would open fully
today it wont open
its a sears model 139.53646srt1
120 v
5 amps
60 hz
lt in 96
thank you all for helping the lay public -

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Call service man back and try adjusting up force

Posted on Jan 15, 2009

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Garage door moves few inches and stops, springs are fine, sensros are fine.


If it is not blinking when it stops, then the capacitor is blown. Replace the capacitor and it should resolve the problem.

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Sounds like you have a chain drive garage door opener and you hear a humming sound when you push the wall console. The motor is running but the chain does not move. You need to replace the gear & sprocket assembly.

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

1 Answer

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FIRST YOU NEED TO RESET THE CHAIN .

Unplug power
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Adjust the chain tension.

If it still moves 6-8 inches and flashes 5 times. the problem is in the rpm sensor.

Full diagnostics are in the owners manual - FREE at
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1 Answer

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trolley is not attatced to the chain, grab that red rope that is hanging down and give it a ****. run the door up until it re-locks onto they trolley

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