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

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Opener goes 12"+/- and then returns

I have an older Sears model 139.53210 that when you either push the remote or the button it travels about 12" and then stops and returns. It did have one roller that came out of the track (which I did put back into the track) and when that happened the worm gear wore the plastic teeth off the plastic gear (not the worm gear). Went to Sears and got the replacement parts, installed them and now have the travel problem. I have tried to adjust the all the adjustments and nothing works.

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  • Anonymous Jan 22, 2009

    Same exact situation. I think the chain has streched over the years and now has too much slack in it when it starts to push the door down. the chain buckles for a second and then reverses to full open position. Works properly 2 out of 3 times, however 1 out of the 3 times the door starts and returns to the full open position.

  • Anonymous Jan 22, 2009

    Sounds like the same problem here. It is just the trolley for me not the weight of the door causing the problem. I first had it where it was going all the way down and reversing and then coming up to the top and slamming to a stop. I adjusted it so it didn't have that problem at the top but it was still reversing. Then it was cycling down and popping up about 12".

    Now it is just doing the 12" movement thing.

    On the inside of the unit the travel distance is not being affected by the little sled like piece in the middle of the up and down travel screws - the little sled moves but nothing contacts the arms causing it to stop, so I am not sure what the problem is.

    It is not the sensors and not the door though.

  • Anonymous Jan 23, 2009

    Same issue as above. I have tried adjusting down force. The up and down force was already set on "5" (which seems high compared to what I have seen on the internet). But I adjusted it up and down and it had no (noticeable) effect.

  • boygeren Jan 23, 2009

    I have replaced the RPM sensor adjusted the up force and down force (Marty), checked the nylon bushings and gears and it still goes down about 8 inches, then up again 8 inches. I am not getting any flashing codes (5 or 10) that would lead me to believe that it is a safety sensor problem. Tiem to buy another?

  • bdurfee Jan 24, 2009

    I have the same problem.... I replaced all the worn gears and checked all the settings. As I try and close the door, it travels about 12" and stops and goes back up. I can't figure out what causes that. If the door is closed it opens perfectly fine. It only happens when the door is trying to close.


  • LENA_ST Jan 26, 2009


  • bgreens Jan 26, 2009

    Same as the others. The drive gear was stripped, we replaced that and the door keeps cycling up and down 8" each time we press the button. We adjusted all the adjustments (including the down force) at one point or another and none of the adjustments changed the situation. Not making any difference. Sounds like we all have the same problem. What else can we check?

  • offline2 Jan 28, 2009

    I share the frustration.  Replaced the gear and as well as the rest of the kit and now it travels two feet stops and reverses



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Havent heard any of yu say you adjusted the down force.

Posted on Jan 22, 2009


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1 Answer

What does the purple button light flashing on 1/2 horsepower craftsman garage door opener

I think the adjustment mode is on.

For example, that's from Craftsman manual:

Setting the Force
The force setting button is located on the left panel of the motor unit. The force setting measures the amount of force required to open and close the door.
1. Locate the purple button on the left panel of the motor unit (Figure 1).
2. Push the purple button twice to enter the opener into Force Adjustment Mode (Figure 2). The LED (Indicator Light) will flash quickly.
3. Push the remote control or control console (Figure 3). The door will travel to the DOWN (close) position.


Actually, you should just read carefully your garage door opener unit's manual.

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Sounds like your door sensors are out of alignment or have gone bad. They each have a small light that should be on and not flickering for them to work properly. Tweak them a bit to get them aligned and check. If you can't get both lights to come on you either have bad wiring to them or a sensor that has gone bad.

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You have to sync the remotes to the new code. For older remotes, you can open the remote and match the pin settings.

For newer remotes there's a button that you push in the back of the opener that sets in program mode (for Chamberlain). When you push the remote button, it will acknowledge the remote is programmed.

If this doesn't help, comment back on your particular model and we'll help you with the solution.

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Sears garage door opener

I just found the solution for my 'ancient' Sears garage door opener, model # 139.655000, and I figured I'd share it.

There's a separate radio module, wired to the main opener. This module is small, has a short wire/antenna, and plugs directly into an outlet.

There's a manual open/close button on this module (I didn't realize this until I got up on a ladder). This button is also a removable cover; underneath it is a "smart actuate" button -- this is your learn button.

What I did was: unplug the radio module. Pry off the cover. Plug the radio module back in. Hold down the button on the remote. Press the "smart actuate" button. This programmed my remote successfully!

Jul 09, 2008 | Sears Craftsman LiftMaster Chamberlain...

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