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Garage door won't open but, motor hums. What's the problem

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1 Answer

M otor hums but door does not open


If the motor is running and the chain or belt isn't moving, you have a broken gear in the opener.

Mar 26, 2014 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Motor hums but does not open garage door


Either the opener trolley is disengaged or you have a broken gear/sprocket assy.

Mar 26, 2014 | Sears LiftMaster Building Materials

1 Answer

The garage door hums for a few seconds and then stops, the door won't go up or down.


Make sure the trolley isn't jammed against the bolt just in front of the motor.

Oct 29, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My 41A4315-7a Garage door opener Motor does not engage. It just hum sfor a second then stops. I checked the internal gears and they seem fine. The door buzzes for a second then stops. Any Ideas.


If the door is not stuck in the open position and just hums you could have a bad start capacitor. It is alongside the motor and has 4 wires going to it.

Dec 15, 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...

3 Answers

Motor hums but door doesn't move. If I disconnect door and give chain a horizontal poke, it will move. When I reconnect door it returns to humming, without movement.


Remove the cover from the motor unit and you will find the drive gear has stripped. White sawdust all over. The part number for the gear kit is 41A2817 and it comes with instructions. It is available at any good door opener service company.

Feb 04, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Motor hums but door will not open


Remove the cover and check the drive gear. It is white nylon and is just in front of the motor. The part number is 41A2817 and is available from Sears or any good door opener service company. It comes with instructions.

Jun 07, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Motor hums but nothing happens


I just had the same problem. Extreme cold, garage door stops working, motor hums, same here. I opened up the my garage door opener(after unplugging it), and found that the wormwheel had a wear spot on it. This is the gear that allows the motor to raise and lower the garage door. Any way, after the wife "sugested" that the door was too heavy to lift, I went and bought a new garage door lifter. But if you are handy dandy with tools, I have seen the wormwheel for sale here. http://www.aaaremotes.com/gearsprocask.html It's the plastic wheel that went bad on me. If I would have found this before buying the garage door opener, I would have got the sprocket assembly. I hope this helps!

Jan 10, 2009 | Sears Craftsman LiftMaster Chamberlain...

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