Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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Garage door will not open

Hello, My garage door will not open. It makes noise and it seems like the red release cord is stuck. Before this happened the door opened by itself one day. I closed it and it seemed ok for a few days and now it is stuck closed.

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Remove the cover and check the drive gear. It is white nylon and is just in front of the motor. It is most likely stripped.

Posted on May 18, 2009

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Posted on Jan 02, 2017

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Liftmaster Professional 1/2 HP spindle not turning


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Have a Craftsman 1/2 HP Garage Door Opener, been working fine. Now when you start it you hear the motor running as normal but the chain doesnt move?


You must ensure the drive chain is engaged to the door puller.
Sometimes the emergency release if pulled (red cord) the drive and the coupling come separated.
Make sure the pin is back in place (pull release cord and make sure pin springs back in).
The run an open close cycle, it should pick up the drive again.


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Many thanks

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IF THE BELT IS MOVING - THE DOOR HAS BEEN RELEASED FROM THE TROLLEY.

PULL THE RED ROPE AND MAKE SURE IT LOCKS ONTO THE INNER TROLLEY.

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