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

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Adjustment how do i adjust how high and how low the door whats easyesest way

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  • marty metzger May 11, 2010

    which model. how old. turn travel adjustments on side of motor for newer units (past 30 yrs), Adjustment may be on bottom by light bulb on OLD units or inside cover.

  • marty metzger May 11, 2010

    what brand

  • marty metzger May 11, 2010

    Well friend, how do I change engine in car. It would help if you told me make, age. Different brands do this very different ways.

  • Joseph Chapman
    Joseph Chapman May 11, 2010

    WE can not help you if you don't give us more information.

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ON THE SIDE OF THE UNIT THERE ARE 2 SCREWS.

THIS IS A VERY FINE ADJUSTMENT TURN ABOUT 1/4 TURN AT A TIME AND RUN THE DOOR.
OPEN YOU WANT EVEN WITH HEADER CLOSE YOU WANT AS TIGHT TO THE FLOOR AS IT WILL GO WITHOUT REVERSING-THIS HELPS IT SENSE ANY OBSTRUCTION THAT MAY BE THERE. (BICYCLE, CAT ETC,)

HOPE THIS HELPS

Posted on May 27, 2010

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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

Do you know how to get the adjustment controls back to the original factory settings?


The controls on every opener are adjusted to the condition of the door it is opening. The force adjustments should be set at minimum and then adjusted so that the door operates consistently. Do not set them too high as it affects the safety of the system.

Oct 17, 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

I have a new Sears 315mhz garage door opener and the door fails to reverse when an object is placed under the door


It sounds like the force adjustment may be set too high. Check this:

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.



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

1 Answer

Track rail bends when closing the door


I think you need to take the cover off the motor unit and watch the limit switch assembly in operation. Takes only a few seconds to see how it works and see if it is damaged in some way. You need to turn the down limit adjustment in the opposite direction of the arrow printed on the cover to stop the door sooner. I think the down force adjustment on the rear of the motor unit is out of adjustment also. This adjustment affects the safety of the opener and should only be adjusted high enough to consistently close the door.

Oct 08, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door is going down too far


Use a flat blade screw driver to adjust these limits by inserting it in the holes as labeled . Start gradually adjusting and stopping the travel if needed by pushing the open/close control as per usual.

Aug 02, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

After opening, my automatic garage door creeps back down a bit


There is a sensitivity switch for both directions, open and close. If you access the garage door opener in the ceiling, you will see two adjustment screws for calibrating these. I would highly recommend following the instructions in your manual, as these are life safety adjustments! Your sensitivity for closing the door is adjusted to the positive. You just need to back it off a little. Place a 2x4 on the floor of the garage where the door comes down. and when the door hits the 2x4, it should automatically come back up. If not, you adjusted it too far. Hope this helps. and remember, check the manual for your specific adjustment procedures.

Mar 13, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

GARAGE DOOR OPENER


Refer to your owners manual to adjust the travel limits to stop the door opening too high

Apr 30, 2008 | Sears Craftsman LiftMaster Chamberlain...

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