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

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I have a craftsman 3/4 garage opener. When it is traveling down it will contuniue past the adjusted stopping point and keep going untill it runs out of track and then travel back up.. It seems to only have this problem when the weather is below 50 degrees.. Help!!!

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It sounds like your door is traveling just a bit too far in the down direction. Locate the 'down limit' adjustment on the side of your motor unit and turn this control a bit in the opposite direction of the arrow printed on the cover. Some tweaking will then be necessary to get it just right.

Posted on Oct 13, 2010

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1 Answer

Chain tight against stop bolt and will not close


Take the stop bolt out and run the garage door down.
Adjust your up travel limit so it spent open up so far.
Replace the stop bolt and nut.

Aug 25, 2014 | 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

Garage door doesn't open and close properly


Loosen the chain enough so that you can remove it from the sprocket above the motor unit. With the door closed run the motor until the sprocket turns clockwise and stops. With everything attached replace and tighten the chain. Some adjusting of the up and down limits will probably be required.


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

1 Answer

It will only travel down a short distance then reverse


With the door in the open position loosen the chain enough so that you can remove it from the sprocket above the motor. Now run the motor until the sprocket has turned counterclockwise and stopped. With the door still open and everything attached replace the chain on the sprocket and tighten. Do not overtighten. This will get everything back into sync and some adjustments of the up and down limits may be necessary. Be sure to set that down pressure control back where it was as it affects the safety of the opener.

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

1 Answer

Craftsman 1/2HP Door Opener won't stay closed


Loosen the chain and run the opener until the sprocket runs in the counter clockwise direction and stops. Now with the door in the open position replace the chain. This will get everything back into sync but I hope you remembered where all those controls were. You need to put them back in their original positions.

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

1 Answer

Door will not stay closed


Remove the cover and take a look at the limit switch assembly. It pretty much snaps together and it sounds like a part has come loose.

Jun 03, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman 1/2hp garage door opener does not go down to floor


I'm no expert, but on a previous door opener I had (don't know the brand), the side adjusting screw basically adjusted a limit switch, which was located inside the plastic housing (where the motor is). I was able to remove the housing, figure out which limit switch was actually being contacted "too soon" on the way down and adjusted it while watching it.

Just a suggestion, you might take a look.

just keep your hands out of the way of the chain and sprocket if you do take the housing off. .

Mar 03, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Sears Craftsman 3/4


Open up the caseand look at the travel assy. Sometimes the limit (up or down) do fall off the assy. Just snap it back on.

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

3 Answers

Garage door won't close


your door travel screw is set to go too far on the downward travel. you need to set the down travel. It is set to go too far down. find the screw adjustment on the unit that says close and back off the screw a full turn until door stops short of floor. then start turning screw other way until door just touvhes floor.

Feb 24, 2008 | Sears Craftsman LiftMaster Chamberlain...

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