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

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Craftsman GDO Will not close

I recently replaced the gear assembly in my craftsman 1/2 horsepower GDO, and now the door will open but when trying to close it only closes about 6 inches or runs 3 seconds and then reverses direction. Help please!!

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  • Anonymous Jan 20, 2008

    Motor will not complete the down cycle. Comes up fine until it hits limit switch and tries to reverse and will act as if a sensor is interupting Light blinks and shuts off.

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2 Answers

I have tried adjusting the sensors to no avail. I have tried taking the chain off and it still will not cycle . Is there possibly something wrong with the installation of the Worm Gear ?

Posted on Jan 20, 2008

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  • Master
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Readjust the sensor controls on the side of the unit

Posted on Jan 10, 2008

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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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Jan 10, 2016 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My 20 yr. old Craftsman 1/2HP chain drive GDO (139.18590) will click and hum for a second but the door doesn't move when I press a remote or wall console. The door moves freely manually and I checked the...


If your door is stuck in the open position the trolley is most likely jammed against the bolt just in front of the motor unit. You should be able to loosen the chain enough that it releases the pressure on the trolley and then close the door. While the door is closed, locate the 'up limit' control which is on the side of the motor unit. Turn this control 2 full turns in the opposite direction of the arrow printed on the cover and then tighten the chain.

Feb 21, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My Liftmaster GDO makes a clicking sound and won't open


See if the trolley is jammed against the bolt just in front of the motor unit. If so remove the bolt and then run the opener until the door is closed. While the door is closed locate the 'up limit' control which is on the side of the motor unit. Turn this control 2 complete turns in the opposite direction of the arrow printed on the cover. Remember to replace the bolt.

Jan 09, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a 1/2 hp Craftsman GDO. It intermittently works. When it does not work, to get the door to open or close, I need to push the remote button several times to open or close it all the way. At times it...


On the rear of the motor unit you will find the up and down force adjustments. Increase these just about 1/4 turn and try. Make sure the tracks have not been lubricated at some time with grease. With the cold weather the grease becomes thick. The tracks should never be greased.

Jan 07, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opener is malfunctioning


It sounds like the gear and sprocket assembly has gone bad. This would cause the symptoms you have.

Sep 16, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman GDO - Remotes not working


I think this is an easier way to program. Press and hold the button on the remote and then press and immediately release the smart/learn button on the rear of the motor unit. Do this for each remote you have.

Jul 28, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Garage door opener won't open or close door


The drive gear is stripped. Remove the cover and you can see it just in front of the motor. It is white nylon and the part number is 41A2817. Available from Sears or any good door opener service company. It will come with instructions.

Jun 06, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Door opens and then closes wright away


I figured out that when I replaced the gears, I damaged the RPM sensor. It was easy to swap out the old for the new and now it works fine.

Feb 26, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opens about 2 feet and then closes in same cycle


There is an issue with the limit settings. They are the three white screws you can see with the cover off. Put the door in the down position. take the small white piece off the bottom of the gear and sprocket assembly. Turn the center screw until the silver "wing" is at the bottom position. Put the white piece back on the bottom of the gear and sprocket. Adjust the up screw until the door opens fully. Check the force settings. They both should be set on 4-5.

Feb 26, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman GDO, Model 139.53600. moves 4inches up/ down


Find the increase travel adjustment screw and turn it clockwise 1/4 to 1/2 turn.

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

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