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

1 Answer

Doess not open

I can hear the motor runnnig but it's not pulling the chain to open the door.
Doe this means that I need a new unit or is there something I can fix myself?

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1 Answer

Motor needs a gear kit ,cost approx, $40-$50-dollars

Posted on Jun 11, 2008

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2 Answers

Electric motor hums but does not open or close garage door


If it just hums and not actually run. Then the trolley is jammed against one of the stop bolts.

Mar 26, 2014 | Garage Doors

1 Answer

Craftsman 3/4 chain drive will not open, when pressing wall switch I hear click at the unit and the programming light will flash, but it doesn't open the door, or close for that matter the motor...


The unit is for sure repairable. You should 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 it will be obvious if it is bad. If you have had electrical storms it may have gotten to your logic board. You need to pull it and check for burnt or missing traces on the printed circuit.

Aug 09, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opened fine but now when I try to close it, all I hear is a buzzing sound for 3 sec., light comes on but door won't go down.


Your trolley may be jammed against the bolt just in front of the motor unit. If so, loosen the chain enough to relieve the strain on the chain and then run the opener until the door is closed. While the door is closed locate the 'up limit' control on the side of the motor unit. Turn this control 2 full turns in the opposite direction of the arrow printed on the cover. Tighten the chain.

Jul 18, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Unit has power, went up, won't go down. Pushed re set, still nothing. Can hear unit try to engage but will not operate


Check to see if the trolley is jammed against the bolt just in front of the motor housing. If it is you need to loosen the chain enough to release the tension and then run the opener until the door is closed.While the door is closed, locate the 'up limit' control on the side of the motor unit. Turn this 2 complete turns in the opposite direction of the arrow printed on the cover. Tighten the chain.

Apr 01, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I press the button to close the door and i hear a click at the motor and nothing happens


Check to see if the trolley is jammed against the bolt just in front of the motor unit. If so, loosen the chain enough to take the strain off the chain and run the motor until the door is closed. While the door is closed locate the 'up limit' control on the side of the motor unit. Turn this 2 full turns in the opposite direction of the arrow printed on the cover. Tighten the chain.

Nov 02, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Opener opened fine from the wall and stopped


Check to see if the trolley is jammed against the bolt just in front of the motor unit. If so, loosen the chain enough to ease the tension on the trolley and run the motor 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 complete turns in the opposite direction of the arrow printed on the cover. Tighten the chain.

Jul 20, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a craftsman garage door opener model 139.53674SRT2. It was working fine and we opened it and closed it twice today with no problem. The third time we opened it, it would not close. Both led...


The led blinking 5 times is the code for "RPM sensor or motor overload." The motor has an thermal switch which opens when the motor get hot from running too much. This automatically resets itself after about 15 minutes. This problem can also be caused when the door opens too far and the trolley jams against the bolt just in front of the motor unit. To correct this you need to loosen the chain enough to eliminate the tension against the trolley and then run the motor until the door closes. While the door is closed locate the 'up limit' control on the side of the motor unit. Turn this control 2 complete turns in the opposite direction of the arrow printed on the cover. Tighten the chain.

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

2 Answers

I can hear the motor "working" but the chain is not moving and so door will not open?


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'm sure you will find it is stripped. The part number is 41A2817 and is available at any door opener service company. It comes with instructions.

Mar 15, 2010 | 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...

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