Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC
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Posted on Jan 02, 2017
if youcan hear the motor turning when you hit the remote or wall button the plastic gear in the oprator has been ripped and if you take the cover off you will see all of the whote plastic dust that has come from the gear being shreded. You can replace this gear. you do not have to buy a new operator. it is very easy to replace this gear. I can't tell you were to buy one because I buy all my stuff from a dealer.
Posted on Jun 11, 2009
Formula what? they have over forty different types. though sounds something like either limit switches may be faulty. Is this door new? Are there any odd noises from the motor?
Posted on Mar 22, 2009
wI have never heard of this problem. you have to hold the button on your wall in to close the door. no way this is not right something wrong with your board insid the opener. get help from a pro. I would love to see this been doing this for 20 years never heard of this.
Posted on Jun 20, 2009
The motor will probably need rewinding.
Professional job. Don't forget to take the condensor with the motor.
Or alternatively, if money isn't a problem,, get somebody out to look at it.
There ya go:)
Posted on Jul 27, 2009
The shaft on these garage door motors are not direct drive systems. You'll have to open up the box to see what the actual problem is. I have had stuff like this happen where a gear just slipped out of place.
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.
Posted on Feb 14, 2010
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