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

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Garage door opens about one foot and remains there.

Garage door opens 1 foot and stops. Reclicking will bring it back down. Cannot open beyond 1 foot.....

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Check the door springs. You could have a broken spring. Also remove the cover and check the drive gear. It is a white nylon gear just in front of the motor. It is possibly stripped. This is a good time to release the door from the opener and operate it by hand to see just how heavy it has become.

Posted on Jun 29, 2009

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Found that the nylon drive gear is wearing down and shavings were
sticking in the gear, cleaned out gear and now works fine.

Posted on Feb 15, 2010

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2 Answers

How do you stop the door leaving a foot open at the bottom?


To stop the door in a partially open position, the button on the wall switch or remote should be pulsed when the door is opening from the fully closed position.

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1/2 horse garage door opener doesn,t open all the way. I need about a foot more lift. The tried a trolley stops before the stop limit..Therre is no interference. I Tried adjusting the up limit to no...


You said you adjusted the up limit already. Is it adjusted as far as possible? Usually the screw will become harder to turn. You mention a new door and spring but is the opener the same? My guess is you have a new opener as well and it is out of sync with the trolley. Try turning the up limit back and see if the trolley will stop shorter. If it does, loosen the chain or belt so that you can remove if from the opener's drive gear. Bring the trolley to your stop limit and put the chain/belt back on the gear. Adjust the chain/gear tension and try door operation again. If it was a sync problem, the door should close closer to your limit. Adjust up and down travel as necessary to fine tune it. This worked for me so good luck.

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

1 Answer

Craftsman garage door had a stripped gear so I


if the stops are not wrong.
they tell it how far to go up and down.

then I think the safety sensor is misaligned.
make sure the light on one side is pointed at the receiver on the other. maybe it is dirty or blocked.

good luck!

Jan 10, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

The garage door will go down to the floor and then stop and come back up on its own. also at times will only go down to remain open 3-4 inches


Sounds like you need to recalibrate the stop point. If its coming back up the sensors may be off alingment (make sure the lights green/amber are solid and not flickering) or the door may sense an object that isn there and reverse. You can google Chamberlain powerdrive door opener manual and dwnload it for programing instructions.

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If the main light is flashing 10 times when the door reverses it is a door sensor problem. One may have been bumped so that they no longer point at one another. Make sure the small light on each sensor is lit and not flickering. If this isn't the case you might need to increase the down force a little. The control is on the back panel near where all those white wires go. Increase it about 1/4 turn and try.

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

1 Answer

Worked great the past 2 years. Now, garage door


Remove the cover and take a look at the drive gear. It is white nylon and is just in front of the motor. Most likely stripped.

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

1 Answer

My garage door bucks like a bronco


You have a door problem. The reason the door is reversing to the open position is because when it bucks the safety senses something wrong. Release the door from the opener and operate it by hand. You should find something.

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

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there are little knobs on the back for adjusting up and down turn them up and you should take care of your problem.

Feb 19, 2009 | Sears Craftsman LiftMaster Chamberlain...

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Quantam #3212 garage door opener stops beabout 1 foot from top


There are two limit adjustments on the opener. usually the screw show which way to turn if the door needs to be lowered more or raised more. Turn them only about a1/4 turn with each adjustment.

Jan 11, 2009 | Sears Craftsman LiftMaster Chamberlain...

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