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

4 Answers

Cradtsman 1/2 hp garage door opener. Drive gear

I have a Craftsman 1/2 hp model # 139.53615SR garage door opener. Drive gear was stripped. After replacing the worm and drive gears yesterday and reattaching the chain, door would not travel all the way up, just down. I played with the travel and limit adjustments some, and now the sprocket will only turn 2 seconds forward then 2 seconds back, with or without chain attached. Any suggestions??
Thanks

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  • rhblenden Feb 09, 2010

    Thanks for the reply. Answers to your question are below.



    Does this unit have the sensor on it to stop when an object is in the way of the door?

    If so, try unpluggin it and see if it helps at all.



    Yes, that sensor must be built into the circuit board because it has the up and down force adjustment screws. I've detached the wiring harness connector from that board and it makes no difference.



    Another thing you could do is unplug the unit for a few hours. In the meantime of being unplugged, try pressing the button for a 5 full seconds, then wait half hour more and see if it resets.



    If by button you mean the remote or main door button, I tried but no luck. I'm not sure without power on what pressing that would do anyway.



    Also try adjusting the unit with the door unlatched from the chain. The adjustment sounds like it is off.



    I've had the chain unlatched ever since I started having this problem (to see if it had anything to do with door binding). The adjustment is definetely off since I started playing with it, but I'm looking at the adjustment screws with the cover off and it makes no difference where the adjustments are. Including up and down travel, and up and down force, it does the same thing. 2 seconds of travel one way, and then auto reverses travel 2 seconds the other way. I'm thinking the board may have gone bad while I was trying to get it working correctly. The motor still seems to have sufficient torque and there's no internal binding. But it's as if it's feeling a stop force each direction after a few seconds of travel. Like you said, it seems like the adjustment is off, but the adjustment screws have no bearing on what it does.

  • rhblenden Feb 11, 2010

    Here is the string with the previous suggestion. Thanks

    Cradtsman 1/2 hp garage door opener. Drive gearI have a Craftsman 1/2 hp model # 139.53615SR garage door opener. Drive gear was stripped. After replacing the worm and drive gears yesterday and reattaching the chain, door would not travel all the way up, just down. I played with the travel and limit adjustments some, and now the sprocket will MoreI have a Craftsman 1/2 hp model # 139.53615SR garage door opener. Drive gear was stripped. After replacing the worm and drive gears yesterday and reattaching the chain, door would not travel all the way up, just down. I played with the travel and limit adjustments some, and now the sprocket will only turn 2 seconds forward then 2 seconds back, with or without chain attached. Any suggestions?? Thanks

    Comments:
    Feb 09, 2010 - Thanks for the reply. Answers to your question are below.

    Does this unit have the sensor on it to stop when an object is in the way of the door?
    If so, try unpluggin it and see if it helps at all.

    Yes, that sensor must be built into the circuit board because it has the up and down force adjustment screws. I've detached the wiring harness connector from that board and it makes no difference.

    Another thing you could do is unplug the unit for a few hours. In the meantime of being unplugged, try pressing the button for a 5 full seconds, then wait half hour more and see if it resets.

    If by button you mean the remote or main door button, I tried but no luck. I'm not sure without power on what pressing that would do anyway.

    Also try adjusting the unit with the door unlatched from the chain. The adjustment sounds like it is off.

    I've had the chain unlatched ever since I started having this problem (to see if it had anything to do with door binding). The adjustment is definetely off since I started playing with it, but I'm looking at the adjustment screws with the cover off and it makes no difference where the adjustments are. Including up and down travel, and up and down force, it does the same thing. 2 seconds of travel one way, and then auto reverses travel 2 seconds the other way. I'm thinking the board may have gone bad while I was trying to get it working correctly. The motor still seems to have sufficient torque and there's no internal binding. But it's as if it's feeling a stop force each direction after a few seconds of travel. Like you said, it seems like the adjustment is off, but the adjustment screws have no bearing on what it does.

  • rhblenden Feb 13, 2010

    Thanks for your reply Rusty. So far that's the best advice, because I know exactly what you're talking about. Moving the up and down stop contacts back and forth is exactly what I was attempting when I finally gave up. The reason I gave up, and to answer your first question: no, the contacts are not even being hit when the sprocket makes it short back and forth travel. I will try your suggestion today and get back.



    Thanks again

    Randy

  • rhblenden Feb 13, 2010

    Your suggestions were very good for setting the travel limits and getting the contacts in the correct postition. However, no matter what I do, I get the same results with the 1' or so travel in each direction, door hooked up or not, contacts making or not.

    After first replacing the gears last w/e I started with good travel down and a few feet up. After some adjustments to get the up travel better, it started this. I feel at this point that either the motors binding or there's something wrong with the electronics.

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It sounds like your safety eye at the bottom of the door is either not lined up properly, blocked by something, or a wire broke off. The units should have an led to which blinks when the two units can't see each other. Try adjusting the angle. During the repair one or both could have gotten moved. When the leds go out it should work. Also check to make sure both wires on each unit are attached properly. I just had that problem with mine tonight and had to restrip the wires and reattach. Try my suggestions and let me know if you need anymore help.

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Posted on Feb 15, 2010

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Hey,
Yep that's a common problem done it myself!! When it runs for 2 seconds is it making contact with the switch to shut it off or does it stop before making it? Assuming it makes it.. since you've already taken off the chain I would slide trolley to the down (closed position) then attach door just to make sure it's in the right spot. Now pull cord to disengage door again. At the bottom of the gear shaft is a plastic clip, take it off. Now remove the gear at the bottom that the clip was holding in place. Now you will have much more control and greater range. You can spin the gear of the limit switch to move into alignment. You'll have to play with it a bit to get the hang of it,but move the down switch until it makes contact. Now the opener will know its in the down position. Next move the up travel. Remember a couple of full turns can be several inches of travel, so take it slow. There has to be enough distance between the down and open positions on the switch to allow enough travel to fully open and close.Down should be closer to the back and up closer to the front, neither should be near the very end of their range.Put the gear and clip back on and try her out. If it looks like the trolley is threatening to hit the opener you can pull the ac cord just before it does. Then you can adjust the up (hopefully w/o needing to take the gear off again) to make contact if needed. Contact me if you need more help. Thanks

Posted on Feb 12, 2010

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Does this unit have the sensor on it to stop when an object is in the way of the door? If so, try unpluggin it and see if it helps at all. Another thing you could do is unplug the unit for a few hours. In the meantime of being unplugged, try pressing the button for a 5 full seconds, then wait half hour more and see if it resets. Also try adjusting the unit with the door unlatched from the chain. The adjustment sounds like it is off.

Posted on Feb 07, 2010

  • Nate Stansfield
    Nate Stansfield Feb 14, 2010

    I believe you may have a problem with the electronics. It could be gears be jammed or a faulty motor which I have seen as well. You can test power to the motor with a voltmeter to see if the motor is getting power from the electronical board. Do check the gears to make sure they are not worn, binding, or loose.

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CK the level on the Garage Door if one side is 2 inches higher then the other side Door will not open Normal.

Posted on Feb 10, 2010

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