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

1 Answer

Door opens alittle then closes but not back all the way

Ok let me try to tell you the problem I'll push door button to open door door opens about 18 inches then reverses maybe back 8 inches.So I'll push botton again samething happens over and over never closeing or opening all the way so you have to keep pushing button to get it back closed.This a 1/2 hp door opener Thanks for any help you could give.

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  • carris427 Jan 05, 2009

    Hi again thanks for info alittle more about problem this was working fine then just started.I did before lube door and by hand works nice spring feels and looks good.Like I said I push door button door opens 18 inches stops so I push again door will close 6 inches then reverse and go another 6 inches never closing or opening.Then everytime you try to open or close just does samething over and over and like I said was working fine before.To get it to close back down push botton and it goes down then tryes to reverse before getting to bottom so push botton and it stops and then push again goes alittle further down keep doing that until its closed all the way.Like a said this was working fine day before a few days ago I adjusted the down travel alittle and lubed door other then that seemed ok.Thanks for any help

  • carris427 Jan 05, 2009

    Hay guys one other thing this does this with or without door hooked to it.Thanks

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If you have a Chraftsman/Liftmaster:
1.Check to see if the door is running correctly.
A. Run the door down and pull the emergency release. See if the door will run easily by itself.
1. If it runs hard by hand try lubricating the rollers and hinges with silicone spray or some form of lubricant (not WD 40)
2. If the door is heavy and falls back to the ground, you probably have a spring issue (either broken or needs more tension) in this case call a professional door repair company in your area.
B. If the door runs fine then check the up and down force on your operator (the box that hangs from the ceiling and reads Craftsman). If the light(s) on your operator go from 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.
C. If this does not solve your problem the top bushing could be going out of your operator. Open the case and see if a lot of black filings are on the top of the big gear. If so the gear assy. will have to be replaced part # 41C4220A

Posted on Jan 04, 2009

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Anytime a door opens and/or closes by itself I look for a smashed wire between the motor unit and the wall button.

If the wire is smashed the insulation becomes so thin that power will leak thru the insulation and activate the door.

Loosen the staples with a small screwdriver and slide the wire about ½ inch to move any areas of thin insulation away from the staples.

The second thing would be a bad wall button or a remote with a sticking button.
Or a remote in someone’s purse that gets the button pushed by other stuff in the purse.

The test is to disconnect the push button wires at the power unit. If the self operation stops you have located the problem. If you reconnect the wires and disconnect the wire at the wall button this will tell you if the problem is the wire or the button.

This can also interfere with remote controls

HOPE THIS HELPS

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