Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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The utomatic garage door does not work; only works manually. The motor is working because I can hear it.

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It sounds like a gear is stripped in the gearbox which will caus the mechanism not to turn.

Posted on Mar 27, 2011

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1 Answer

Avanti motor garage door only works occasionally can hear realay`s click but motor does not run


The relay contacts are worn. Replace the relay first. If the condition is the same , look at the motor's safety overload device.

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I have a Sear Hbw07777 opener and replaced the sensor. the sensor is now working but when i tried the garage door switch the drive would turn, you could just hear the motor turning! whats the problem


It sound like you have a bad drive gear. This is a white nylon gear just in front of the motor. If it is bad it will be obvious. The part number is 41A2817 and it comes with instructions.

Jan 13, 2011 | Sears Craftsman LiftMaster Chamberlain...

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Liftmaster 1/2 HP Garage Door opener won't open or close. Has been working fine until I pulled out this morning. The door will move freely if I disengage from opener. Went up ladder to see chain not...


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.

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.

Feb 14, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

I have a Sears Garage door opener (139.53800SRT)was working and then just quit working. None of the remotes or wall switch work. When I press a switch I hear a few click in the opener and then nothing. ...


The code for 5 flashes is " Motor overheated or possible RPM sensor failure. Unplug to reset." Also if the door is stuck in the open position it could be the trolley is jammed against the bolt just in front of the motor unit.

Feb 07, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My garage door hums but does not open. It had


Sounds like you have a bad start capacitor. It sits next to the motor and is about the diameter of a silver dollar and about 5 inches long. You can get one at any good door opener service company.

Feb 06, 2010 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Garage door opener won't open or close door


The drive gear is stripped. Remove the cover and you can see it just in front of the motor. It is white nylon and the part number is 41A2817. Available from Sears or any good door opener service company. It will come with instructions.

Jun 06, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a 1995 Sear garage door opener that stopped working


The trolley (the part that moves back and forth and is connected to your door) of your opener is most likely jammed against the bolt just in front of the motor unit. You can remove the bolt or loosen the chain until your unit will run. Once the door is closed find the 'up limit' on the side of the motor unit and turn it about 3 turns in the opposite direction of the arrow printed on the cover. Now replace the bolt or tighten the chain. Whichever you first did.

May 28, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

I CAN NOT PROGRAM MY BUILT IN CAR REMOTE ON MY NEW 139.53985DM


didnt try everything cause if you did, it would work! Get two people and garage door opener. One read manual from car under Garage door" or Homelink while other pushes button. When manual says if this did not work or if you have security plus or rolling code, continue with other instructions. You will need a working remote and will need to pushh learn button on motor logic board.

Dec 25, 2008 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door motor does not operate


YOU MAY HAVE A BAD MOTOR STARTING CAPACITOR OR CIRCUIT BOARD GOTO LIFTMASTER.COM AND DOWNLOAD THE FREE PDF FILE FOR A MODEL 3280 THE TROUBLESHOOTING GUIDE IN THIS MANUAL SHOULD HELP.

Nov 26, 2008 | Sears Craftsman LiftMaster Chamberlain...

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