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

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Liftmaster - push button to open door, motor runs as normal but chain does not move to raise door

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Remove the cover from the motor unit and check the drive gear. It is a white nylon gear just in front of the motor and I am sure you will find it is stripped. The part number for this gear is 41A2817 and is available at any good door opener service company. It comes with instructions.

Posted on Sep 07, 2010

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With my door closed, i push door button to open and the chain and opener continues inthe closing mode. any help?


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2 Answers

Liftmaster Garage Door Won't Close


Sounds like maybe the door traveled too far and the trolley has jammed against the bolt just in front of the motor. If so, loosen the chain enough to take the tension off the chain and then run the opener until the door closes. While the door is closed locate the 'up limit' control on the side of the motor unit and turn it 2 full turns in the opposite direction of the arrow printed on the cover. Tighten the chain.

May 27, 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.

Feb 12, 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

I have a old Liftmaster Garage Door Opener. This morning when I pushed the button the motor went on but the chain didn't move to open the door. What's the story?


If you remove the cover I'm sure you will find the drive gear is stripped. It is a white nylon gear just in front of the motor. It is available at any good door opener service company and comes with instructions.

Jan 05, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door chain isnt engaged. motor is running


SOUNDS LIKE A BAD GEAR KIT

IF THE CHAIN MOVES BUT THE DOOR DOESN'T IT WOULD BE THE TROLLEY RELEASE. IF THE CHAIN DOESN'T MOVE IT WOULD BE THE GEAR KIT.
HOPE THIS HELPS

Jan 03, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

When I push the button to open my garage door, the


Remove the cover and take a look at the drive gear. It is white nylon and is just in front of the motor. It is probably stripped. It is a good time to release the door from the opener and try raising it by hand. Your door springs may be weak or possibly broken.

Oct 15, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage Door opened but will not close. I opened


I think the trolley has jammed against the bolt just in front of the motor unit. Remove the bolt and then run the door until it is closed. With the door closed locate the 'up limit' control on the side of the motor unit. Turn this 2 turns in the opposite direction of the arrow printed on the cover. Replace the bolt.

Sep 01, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Door won't close unless i push button on wall several times


You probably have a stripped gear inside opener. Take off cover and the bottom will be filled with white flakes from stripped gear

Jan 23, 2009 | Sears Craftsman LiftMaster Chamberlain...

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