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

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The door only goes up, I have tried the force adjusters turning all the way down and reset, and the traveler adjuster, doesn't solve the problem. please help me how to adjust all those 4 adjusters. thank you very much

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What is the make and model number? What does it do when you try to close it?

Posted on May 19, 2011

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We have installed the craftsman garage door opener and have continually adjusted the up and down travel limits and the door will not stay down


try adjusting the down force. the force necessary to may it reverse. it may be set too light. increase the down force and see if that helps. usually screw in back of unit. and usually labeled.

Jul 24, 2015 | Craftsman Garage Door Opener 1/2 HP Chain...

1 Answer

Door closes all the way but then opens again


you can try adjusting the down force. what it sounds like when the hits the bottom the force sensor is saying there is an obstruction and is opening back up . just turn the down force adjustment higher on the logic board. if this isn't the problem you may have to adjust the down travel control, it maybe trying to force the door down to far and causing the force sensor to open door back up. if it is trying to force door to far in travel when the door goes down when it hit bottom you will notice the chain sag or the t bar will bend. good luck.

Sep 24, 2011 | Chamberlain Liftmaster Sears Or...

1 Answer

I have a craftsman garage door opener. Model number 4184315 7D When I close the garage door it will automaticly open by it's self. There is nothing obstructing the sensor that prevents the door from...


There are two sets of adjustments. Down position and down force, If the travel is set to far in the down position the max down force setting will trip and the door goes back up.

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Adjust he down position until a slight gap is visible in the down position. Adjust slight steps until no gap is visible.

If return trips increase the down force slightly . Position adjustments are on the side, down force blue knobs on back. Note adjustment positions before beginning so if you get confused you can start over.

Hope this helps?
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Jun 23, 2017 | Kitchen Ranges

2 Answers

Door closes then goes back up


it needs adjustment, there are usually an adjustment knobs on the unit it self, (check from the owners manual)...

Jul 10, 2011 | liftmaster Chamberlain Garage Door Opener...

1 Answer

I have a new garage door opener that has the black and purple buttons to adjust the force and travel of the door ...... eveything is working well except when the door closes it goes a little to far, the...


I have a feeling the down force adjustment is set much to high. If the door is hitting the floor hard enough to bend the rail the safety should be reversing the door to the open position. Maybe this will help.

The force adjustments control the pressure used to open and close the door. A new garage door opener from the factory is set to the lowest possible force adjustment. If you have a properly balanced door, the forces required to open and close the door should be minimal.



The force adjustments are usually located on the rear of the garage door opener and/or under one of the light lenses, If your opener has two lights. If you have lights on the side of your opener, the force adjustment will be located under the right light lens. The force adjustments are labeled with an arrow indicating open or close and numbered 1 to 9, with one being the lowest force and nine the highest. The force adjustments can only turn 260 degrees, or ¾ of a complete turn. Changes to the forces should be done in 10-degree increments. Please remember that too much force will interfere with the proper operation of the safety reversal system. Do not increase the force beyond the minimum required to close the door. Do not use the force adjustments to compensate for a sticking, binding, or unbalanced door.

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

1 Answer

The garage door goes all the way down but then goes right back up - it does not close


Had similar problem. Re-program travel and force limits. Make sure that travel limit (down) does not go too far (thus excessive force). Apparently this system has a force sensor that senses if there is something in the way of the door. This is different from the safety sensor "eyes". The problem in your setup is that you have programmed the door to travel down too much and he system looses its ability to use force sensor. Adjust travel limit (down) to a little less travel and you will be fine.

Oct 22, 2010 | Chamberlain 1/2-HP Whisper Drive Belt...

1 Answer

No matter when i adjust the force the door goes down, stops briefely, them returns to open position. can't get force adjust to let it stay down.


If the door is hitting the floor and then reversing it is traveling too far in the down direction. Locate the 'down limit' on the side of the motor unit and turn it in the opposite direction of the arrow printed on the cover. Some tweaking of this control will be necessary to get the travel just right. The force adjustment affects the safety of your opener. Try to put it back where it was.

Sep 30, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My door closes but then comes right back up. It also does not come up all the way


Check your travel limit switches. There will be an adjustment for Down travel, as well as 1 for up travel. There is also an adjustment for Force or Sensitivity. Make note of the current positions before changing anything so that you can go back to original settings.

If you are sure that nothing is tripping the light beam(s) / safety sensors, slightly increase the FORCE / Sensitivity adjustment in small increments. Look at the lablel of the adjustment to see which way to turn it, or consult user manual. Small increments at a time, until the door starts to work properly.

If you can't seem to get the sensitivity set, then reset it back to the position it was, and decrease the down travel in small increments until the door goes down, and stays down.

Once the door is staying down, increase the up travel adjustment in small increments until the door stops where it should.

Run the garage door opener through a few cycles for a few minutes. Make note of where the adjustment settings are.

If your door is metal, then you are done. But if your door is wood, you will likely need to adjust the force / sensitivity adjustment when the door is dry (low humidity time of year) as well as when it is wet (rainy season). Usually the best time to adjust the force is when you are in the time of year of when it is most humid. That is when the most stress / friction is on the door hardware.

It takes a little while to get everything perfect, but it is usually hands off afterwards until changes are made to the door.

It would be a great idea to go through and do the maintenance (grease rails, lube rollers, etc) before trying to adjust the opener. It will not only prolong the life of the door and opener, but the adjustments that you make will be valid for a longer time.

Jun 29, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

The opener seems to want to continue closing the door once it hits the ground. Seems like the closing mechanism needs to be adjusted back closer the the garage door closer unit. This did not just...


Try to re-program travel and force limits. Make sure that travel limit (down) does not go too far (thus excessive force). Apparently this system has a force sensor that senses if there is something in the way of the door. This is different from the safety sensor "eyes". The problem in your setup is that you have programmed the door to travel down too much and he system looses its ability to use force sensor. Adjust travel limit (down) to a little less travel and you will be fine.

Jun 18, 2010 | Chamberlain 1/2-HP Whisper Drive Belt...

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