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

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Door dosent close.move about 1 ft then opens.gear was replaced prior.worked for 2 days.now will not close.no flashing warning lights,when door disconnected garage door ok, springs ok,disconnect chain from motor same problem,moves down counter clockwise then goes clockwise

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You may not have had the motor shaft pushed all the way back when you tightened the coupler after replacing the worm gear. Loosen the coupler up and from the front of the motor (opposite end in which the coupler is on) push the shaft back as far as it will go. Hold it there while you tighten the coupler back up and then try it.

Posted on Jul 24, 2009

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Try holding in the wall button. does it now go all the way down? if yes, leave a comment for more info.

Posted on Nov 17, 2015

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Check the down pressure adjustment according to the maual.

Posted on Nov 17, 2015

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1 Answer

Craftsman 1/2hp garage door opener works fine to open door but to close I have to hold button down. If not, door won't move and lights flash 10 times.


10 flashes mean sensors are obstructed... something is in the way of the door or they are not facing each other. Clear the obstruction or realign the door and it will work.

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Chamberlain 1/2 HP garage opener main part 41A5389-1 will not close door. Motor stops about 1 ft into travel on screw. Nothing blocking door - can easily open and close door manually. What to do?


If the main light flashes 10 times you have a door sensor problem. Make sure the small light on each sensor is on and not flashing. Tweak them if necessary. If the main light does not flash then you can try increasing the down force just a bit. This is a control on the side of the motor unit where the small gray antenna hangs. If this doesn't work you probably have a bad IR sensor which is a small printed circuit board just in front of the motor.

May 11, 2010 | Sears Craftsman LiftMaster Chamberlain...

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Liftmaster 1/2 HP Garage Door opener won't open or close. Has been working fine until I pulled out this morning. The door will move freely if I disengage from opener. Went up ladder to see chain not...


The shaft on these garage door motors are not direct drive systems. You'll have to open up the box to see what the actual problem is. I have had stuff like this happen where a gear just slipped out of place.

http://www.aaadooropeners.com/?gclid=CLH3wt628p8CFVZS2goduwSLYQ

Here is a link for a parts supplier. I don't know your model but it looks like most of the Liftmaster worm screw gears and drive gears are plastic so it's possible that one of them has cracked.

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Chamberlin Series 1100 Garage Door Opener will not move over 1 Ft


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Garage door will not close, moves 2 ft & returns


Make sure you put the black cup back onthe end of the motor shaft and that it is pressed all the way on.Make sure the RPM sensor is plugged in. If neither of these are theissue, then you probably did not have the motor shaft pushed all theway back when you tightened the coupler after replacing the wormgear. Loosen that coupler up and from the front of the motor(opposite end in which the coupler is on) push the shaft back as faras it will go. Hold it there while you tighten the coupler back upand then try it.

Nov 05, 2009 | Sears Craftsman LiftMaster Chamberlain...

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My Chamberlain 1/2 HP garage opener moves slightly down and then just humms. It will then reverse to bring the door up. I have checked and the sensors or not blocked or misaligned. The door opens and...


DOES THE LIGHT FLASH AND MAKE A CLICKING SOUND??
YOU DIDN'T MENTION IT BUT IF IT DOES THE PROBLEM IS LIKELY IN THE SAFETY EYES.


YOU COULD HAVE A BAD GEAR KIT OR SIMPLY A SENSITIVITY ADJUSTMENT THAT IS OFF.

TRY INCREASING THE DOWN SENSITIVITY ABOUT 1/8 TURN.

IF THIS DOESN'T HELP UNPLUG THE UNIT AND TAKE OF THE COVER IS YOU FIND WHITE PLASTIC POWDER THE GEARS ARE STRIPPED AND A GEAR KIT IS NEEDED.

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I just replaced the gears in the opener and now the door stays open about 2 ft. When I hit the button it closes about 1 ft. and returns to it's original position...


Loosen and then remove the chain from the sprocket above the motor. Run the opener until the sprocket has turned in the counterclockwise and stopped. Now with the door in the open position replace the chain on the sprocket and tighten. This will get you close and minor adjustments to the up and down limits may be needed.

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

2 Answers

Garage Door Wont Close Craftsman 1/2 HP (1998)


What it is is the electric beams at the door are getting blinded buy the sun or out of line. They are the two black boxes on both sides of the door about a foot from the ground. Put a piece of card board in front of them not blocking the beam dut to block the sun. All that they are is safety beams for kids so they do not get hurt. If you have to move them to the top where the sun will not hit them. Sorry to say though you can not remove them all the way. Also make sure the lite on them is not blinking if so they are out of line.

Good Luck and Please Rate FixYa!

Mar 03, 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...

2 Answers

Garage door won't close.


After replacing the worm gear and main drive gear on my Craftsman 1/2 HP garage door opener I found that my door moved about 4 inches stopped and reversed the same distance. I checked all the settings and everything seems OK. What fixed the problem was I released the two allen set screws on the end of the motor shaft and pulled tha motor shaft toward me. When I replaced the black plastic cap that looks like a pill cap top on the end of the shaft this corrected the depth setting that cap rotated through the RPM sensor. I set the limit settings (up and down) on the side of the opener and reset the force pots marked (KC) to mid range.
the door now works. I hope this helps. I also checked and eliminated the door sensors by putting a box in the beem this inhibited any movemnet at all, so I knew it wasn't the door sensors as there was at least 4 incheds of movement prior to the box and nothing with the box.

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