Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

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M otor hums but door does not open

Motor hums but garage door does not open

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

Posted on May 07, 2014

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Posted on Jan 02, 2017

lobsterman72
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SOURCE: Sears Craftsman 1/2hp Garage Door Opener

Thats one of the symptoms of a lightning strike or a power surge. Without actually being there I would suggest replacing the back-board. But as with lightning strikes and power surges sometimes other electronic components could have been damaged as well.

Posted on Jul 01, 2008

  • 6 Answers

SOURCE: Craftsman Garage Door Opener Won't Open

When mine did this, it was because the nylon gears that drive the chain had stripped. My wife had to live without the opener for a week or more, but I was able to find a new gear kit online and replace the damaged gears. It wasn't difficult.
The other option is to buy a new opener.

Posted on Dec 07, 2008

  • 4 Answers

SOURCE: wayne dalton garage door is humming but wont open

Likely the plastic gears are worn out. Unplug the unit from power source, remove the cover, look at the gears. If worn, it will be obvious from the shavings from the gears. You can buy the gear kit on EBAY for a little as $20 depending on the manufacturer and model. Before removing the chain drive, lock a pair of vice grips on the chain and metal chain rail to keep the chain from turning from its current position. The gears can be replaced without removing the opener. Even if you have to remove the opener, it is a simple task. Most have four bolts that need to be removed and it will be in you hands.

Posted on Jan 15, 2009

  • 118 Answers

SOURCE: motor runs but door does not open

you have a stripped gear on your opener. Replace gear and sprocket kit

Posted on Feb 08, 2009

  • 3197 Answers

SOURCE: 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.

Posted on Jun 07, 2009

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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

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

Liftmaster door opener, motor hums but chain and door does not move. Any ideas? Thanks


If the motor is running but the chain isn't moving you have a stripped drive gear. Remove the cover from the motor unit and check. It should be obvious.

Jan 08, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Liftmaster - motor hums, doesn't turn. Removed


My neighbor guy, who knows a lot about stuff, told me to get a new one.
Good solution.

Jul 18, 2009 | 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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