Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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Garage door will not work

I have 1/2 hp chamberalin door opener. the worm gear and the other plastice grar wore out I replaced these 2 gears now my door open and close only 1 foot,

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  • jenandjeff3 Jan 17, 2009

    I Have the same problem, everything looks to be connected. my door only moves 6-8 inches and then goes in the opposite direction. Can somebody help this is so frustrating.

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Check to see if you plugged in the 4 wire limit assy. harness.

Posted on Jan 06, 2009

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