Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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Just changed out the carraige rack and cant seem to get the travel up and down right. It either goes all the way or stops too soon. Any help?

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It sounds like you may have moved the placement of the trolley when you did this. The adjustment screws are to be adjusted 1/4 to 1/2 turn at a time. This might be the problem.

You may also have a damaged limit assembly on the inside of the unit or the metal drive shaft may need to be replaced. These are things better left to the pro's but if you can handle it and can track down the problem shoot for it. Thanks BB

Posted on Sep 03, 2010

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Posted on Jan 02, 2017

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