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

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Door raises six inches and then goes back down

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Make sure one of the door springs is not broken. Also remove the cover from the motor unit and check the drive gear. It is a white nylon gear just in front of the motor and may be stripped.

Posted on Sep 07, 2010

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I have a 2004 nissan maxima, and my passenger front window goes up, but then it drop down about 3 inches


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I have a Craftsman 1/2 HP garage door opener that has been working flawlessly until yesterday. The door is closed but when I push the wall button, it raises ~ 2 inches and immediately goes back down. The...


First check the door springs. Most likely you have a broken spring. If not, remove the cover from the motor unit and check the drive gear. It is a white nylon gear just in front of the motor and is likely stripped.

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Garage door repeatedly drops after opening.


Remove the cover from the motor unit and check the drive gear.

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1997 chevy astro drivers power window goes down but will only come up about an inch at a time. with about a 5 min wait between attempts to raise it. The switch tested ok. The passenger door window works...


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1 Answer

Craftsman 1/2 HP garage opener opens only 6 inches


Remove the cover and check the drive gear. It is white nylon and is just in front of the motor. It may be stripped. Take a close look at those door springs. They can sometime appear to be okay when one is broken.

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I have an 07 Mustang GT. When you open the door, the window comes down about an inch. When you close the door, the window goes all the way up. Normal. Now, when I close the door the window wont go up. Why...


The window lowering and raising as you open and close the door is normal, it is designed that way to prevent damage to the weather stripping that seals the door glass to the body. The computer controls this action and is activated by the door switch. If the problem is only with the driver door then I would suspect a switch. If the problem is with both doors then I would suspect a computer glitch. Either way I would reccommend taking the vehicle back to the dealer to have it checked out and repaired. Is the car still under warranty?

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