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

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.

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 3,197 Answers

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.

Posted on Sep 30, 2010

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

4 Answers

Door opens itselv after closing


most likely the down stop is set to low, the door hits ground and reverses. so either change the down stop position or increase the down force so it will not reverse upon contact.

Dec 06, 2015 | Building Materials

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.

sears-craftsman-41a5021-2-tp_3035774187492923427f-dmbde0w01a5yu2mfdv43xlfn-4-0.jpg
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?
getimage-dmbde0w01a5yu2mfdv43xlfn-4-2.jpg

Jun 23, 2017 | Kitchen Ranges

1 Answer

Door comes down and goes right back up. then the lite blinks 4 times with a click noise. the safety eyes also are not on


It sounds like you need to adjust your down limit switch and/or perhaps your motor force settings. If the limit switch is not in the sweet spot along the rail it can be triggering too soon or not in time. In your case it could be too far down the rail and thus not stopping/slowing the motor in time. Your door is then being pushed against the floor too hard. Your safety/return force is goes way over limit and tells the opener to go back. While closing your door look at your rail and if its bending when the door hits the ground, this is definitely happening. After finding the sweet spot for your down limit switch, you can readjust your return/safety force per your opener manual.

Jan 03, 2011 | Chamberlain 12HP Power Drive Chain Drive...

1 Answer

The garage door goes up one foot and stops..its a liftmaster professional half horsepower


Disconnect the opener from the door. Operate the opener. It should go back and forth smoothly.
Lift the door. It should go up and down without any problems.
After checking those things, there is a "up force" and "down force" adjustment on the opener, try increasing the "up force" by turning the adjustment in the direction of MORE force.

Dec 06, 2010 | liftmaster Chamberlain Garage Door Opener...

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

My Craftsman 1/2 Hp garage door opener doesn't stop going down despite (quite forcefully!) applying pressure in the opposite direction. It would buckle (and did) if I don't let it continue unhindered...do...


YOU NEED TO ADJUST THE DOWN FORCE.

YOU WANT TO TURN IT COUNTER CLOCKWISE TO THE STOP (THIS ADJUSTMENT IS ONLY ABOUT 3/4 TURN FROM MIN. TO MAX.). THEN TRY THE DOOR IF IT REVERSES TURN IT ABOUT 1/16TH TURN CLOCKWISE. CONTINUE THIS VERY MINOR INCRAMENT ADJUSTMENT UNTIL THE DOOR CLOSES WITHOUT REVERSING. THEN GO 1/16TH TURN FURTHER.

YOU SHOULD BE ABLE TO STOP THE DOOR AND REVERSE IT BY GRABBING THE BOTTOM OF THE DOOR AS IT GOES DOWN AND LIFTING SLIGHTLY. IF YOU CAN'T GET THE DOOR TO BOTH CLOSE AND REVERSE WITH MODERATE PRESSURE YOU MAY NEED ADJUSTMENT TO THE DOOR / SPRING / ETC.
- I DO NOT RECOMMEND ADJUSTING THE DOOR YOURSELF - CALL IN A PRO FOR THAT.

IF THE ADJUSTMENT IS SUCCESFUL ADJUST THE OPEN SENSITIVITY / FORCE IN THE SAME MANNER.

HOPE THIS HELPS

Jun 28, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Our automatic garage door opener does not fucntion well in very cold temperatures (below 32 F). It will not close all of the way and will stop or will stop about half way down and return to the up position...


There is no adjustment for temperature. Make sure the tracks have not been greased. This sometimes causes a problem when it congeals from cold weather. There is no reason to ever lubricate the rails. You can try increasing the down force. It is a control on the rear of the motor unit near where all those white wires go. Increase it a 1/4 turn and try.

Jan 12, 2010 | 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

Craftsman chain drive opener won't stay down


Check the down limit:
If the light bulb(s) on your operator are on the front and/or back, the limit adjustment screw is on the left side of the operator (looking from the back of the operator and facing the garage door).. If the lights are on the sides of the operator then the limit adjustment screw is on the left side (looking from the back of the operator and facing the garage door).

Check the up and down force: 
On your operator (the box that hangs from the ceiling). If the light bulb(s) on your operator are on the front and/or back, the force adjustment screw is on the back of the operator. If the lights are on the sides of the operator then the force adjustment screw is on the right side (looking from the back of the operator and facing the garage door). Turn the light blue adjustment screw with the up arrow to a higher number.


Jan 31, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Installed new worm gear, but now i cant get the door down


Check to see if the 4 wire harness is hooked up from the limit assy.

Jan 09, 2009 | Sears Craftsman LiftMaster Chamberlain...

Not finding what you are looking for?
Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+ Logo

210 people viewed this question

Ask a Question

Usually answered in minutes!

Top Sears Building Materials Experts

Mike

Level 3 Expert

4336 Answers

Cindy Wells

Level 3 Expert

5100 Answers

Brad Brown

Level 3 Expert

15557 Answers

Are you a Sears Building Material Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...