Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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My liftmaster moter hum's and the chain drive will not move

The door arreared to be frozen to the ground before opening. It broke free and opened, but now will not respond to the opener. It only hum's for about five second's.

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  • nlsharks Jan 08, 2009

    door appeared a little frozen when opened, broke free and now motor hums but chain drive will not engage. Cannot figure out what is wrong.

  • Joseph Chapman
    Joseph Chapman May 11, 2010

    Try unplugging it @ 2 mins. and plugging back in. If that does not work, what kind of operator do you have?

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  • 98 Answers

Try opening the case and looking to see if there is a white plasic powder in the bottom of the case. if there is you will have to replace the gears #41C4220A.

Posted on Jan 11, 2009

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CHECK OUT THE MODEL 3800 BY LIFTMASTER

VERY NICE UNIT - WE INSTALL THESE WITH GREAT SUCCESS

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Hi,
There is a rope or string hanging down that releases the dog that hooks the door to the chain...if someone pulled that the door will not open. You need to pull down and back on the srting to relaese the dog and then push the door up to catch the chain...then the door will work again...

heatman101

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http://www.aaadooropeners.com/?gclid=CLH3wt628p8CFVZS2goduwSLYQ

Here is a link for a parts supplier. I don't know your model but it looks like most of the Liftmaster worm screw gears and drive gears are plastic so it's possible that one of them has cracked.

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SOUNDS LIKE A BAD GEAR KIT

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