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

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Motor works but does not move chain on half horse sears

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Clutch? need more info.. wall mount or overhead? If it's wall mounted it could be the clutch, I don't think overheads have a clutch though. The first thing I'd do is get on a ladder and see if the chain is still attached to the sprocket... good luck

Posted on Feb 18, 2009

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Garage opener went up and the stopped mid way.. motor is humming but nothing moving.. sears 1/2 horse model 2000. Thanks John


Tries unplug,replug it back like about an hour latter.The unit now should be resetting itself,should work again.Still have same problems later,the motor should be check out and fix.

Dec 17, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My opener is a 1/2 horse lift master professional chain drive . The door will not close unless you hold the closer button in. From the remote it will only move a few inches and then reverse. The door works...


If the main light flashes 10 times when the door reverses it is a door sensor problem. If not, you probably have a bad RPM sensor board which is a small printed circuit board just in front of the motor.

Jun 28, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a Sears Craftsman 1/2 horse garage door opener. When I push the button, I can hear it hum, but the chain won't move and it seems the sprocket is frozen?


If your door is stuck in the open position you will find the trolley is jammed against a bolt just in front of the motor unit. Remove that bolt and run the opener until the door closes. Now locate the 'up limit' control on the side of the motor unit and turn it 2 times in the opposite direction of the arrow printed on the cover. Replace the bolt.

Sep 03, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

How do you reprogram a sears garage door keyped half horse maybe 10 years old


On the rear of your motor unit just to the left of all those white wires you will find the smart/learn button. Press and immediately release this and then key in your new four digit PIN and press enter on your keypad..

Aug 24, 2009 | Sears Craftsman LiftMaster Chamberlain...

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My garage door opener moves about 8" then reverses direction before touching the limits


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 most likely stripped. You can purchase a new one at Sears or any good door opener company. It comes with instructions.

May 31, 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

How is the chain supposed to be aligned


sync the motor. the gear kit tells you how. get motor up and position trolley near motor, assuming you left chain/cable attached to trolley). Get motor up by running motor and then pushing button again. if motor reverse, let it run and it will stop in up position.

Jan 17, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Motor sounds like it is running but sprocket doesnt move


how old is unit. sounds like gears are shot, takes $25 of parts and 2-3 hours to fix if you are handy. Take cover off, If it has white powder (Not ****), gears are shot.

Jan 14, 2009 | Sears Craftsman LiftMaster Chamberlain...

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