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

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Liftmaster - motor hums, doesn't turn. Removed

Liftmaster - motor hums, doesn't turn then kicks out. Removed chain from drive sprocket to eliminate door mechanism. Motor still hums only then kicks out.
I think it's a bad motor. Does the capacitor help start the motor?
Jon

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

Posted on Jul 19, 2009

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Posted on Jan 02, 2017

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1 Answer

My Lift Master garage door will not close. It makes the closing noise but the door does not slide down. Whcan I talk to to fix this?


Sounds like you have a chain drive garage door opener and you hear a humming sound when you push the wall console. The motor is running but the chain does not move. You need to replace the gear & sprocket assembly.

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My Craftsman garage door opener is not working - I opened the inside of the opener and motor is humming but gears are like jammed....when I prod the gears with a screw driver they do spin for about 3...


I had the same problem. In my case the bushing for the main drive gear was worn out. This is just below the sprocket that connects to the chain.
What you should do is remove the chain and see if that sprocket shaft is loose in the bushing. The motor should turn without the chain on.
If this is the case check the plastic gears within the case. If there all chewed up and the bushing is shot you most likely need to replace the unit. If the gear's are still good you can replace the bushing.
I'm not sure how much Sears would charge to rebuild it but it is very possible it would be cheeper then buying a new one

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I have a Sears Crafstman Garage door wireless opener. Model 139.53615SR . The door hums but nothing happens. The chain doesn't move. The springs on the door broke last year and i replaced both of them....


My plastic gear stripped soon after a spring broke. I think the broken spring put a huge load on the opener that day and ruined the gear. Replacement wasn't too hard. It will be obvious when you remove the cover if the gear is stripped. Here are instructions:
http://tinyurl.com/gearfix
dwdfixya_1.jpg

Dec 19, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

How do I tighten sagging garage door chain?


I think you have more problems than just a sagging chain. It is most likely sagging because the bronze bushing at the gear and sprocket assembly is bad. It lets the sprocket lean forward and loosens the chain. You will also need to remove the cover from the motor unit and check the drive gear. It is a white gear just in front of the motor and is most likely stripped.

Jul 13, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door does not open or close


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

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1 Answer

Craftman door opener brand new wont work?


Sounds like the drive gear is stripped. Remove the cover and take a look. It is white nylon and is just in front of the motor.

Jul 04, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman opener motor works, but chain does not move.


If the motor is working but the chain does not move you must remove the cover on the motor and check to see that the chain is on the sprocket. If the chain is on the sprocket and the sprocket is not moving but the motor shaft is moving then the sprocket must be retightened onto the motor shaft.

Apr 20, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opener motor runs, but the chain drive doesnt turn


If the chain is not moving and the motor is – you need a gear kit.

Unplug the unit - take of the cover – you will find white shavings inside – these confirm the diagnosis. .

Get the gear AND sprocket kit.

It’s a good DIY project but you MUST VERY CAREFULLY Follow the instructions step by step.

HOPE THIS HELPS

Mar 13, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Lift-master chain drive garage door stuck at the protection bolt


you will have to find were the chain is binding look around the drive sprocket and check the chain to see if it is tight at the bottom or top this will tell you were to start looking for the problem.

Sep 19, 2008 | Sears Craftsman LiftMaster Chamberlain...

3 Answers

Garage door drive stuck un up position


I found the chain extremely tight on the sproket. The mechanism had stalled hard against the stop bolt. I loosened the chain tensioner and the motor operated properly. Reset the limit adjustment so the mechanism stops a couple of inches from the stop bolt. Door is working fine now.

Jan 23, 2008 | Sears Craftsman LiftMaster Chamberlain...

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