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

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Garage door opens about 2 feet and then closes in same cycle

I just changed the gears in the craftsman 1/2 horsepower opener and when I tried for the first time the door opens 2 feet and then closes right away.I tried all the adjustment screws and nothing seems to be working.Can someone please help.Thanks

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There is an issue with the limit settings. They are the three white screws you can see with the cover off. Put the door in the down position. take the small white piece off the bottom of the gear and sprocket assembly. Turn the center screw until the silver "wing" is at the bottom position. Put the white piece back on the bottom of the gear and sprocket. Adjust the up screw until the door opens fully. Check the force settings. They both should be set on 4-5.

Posted on Feb 26, 2009

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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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You say it only opens two feet?? Then closes?? If I may if you a little bit more costly option. Dont replace the gears. They used to be really good 8 years ago but the way they make the gears now there too soft and often strip out much faster. I would suggest that you do what we call a motor head change out. Take off your old chain drive motor head and buy a new one. Pretty simple. Two things though one always make sure you put the new one in with the door down. And the traveler in the down position ( The traveler is the metal thing hooked up to the chain) but far and your gear that you have it sounds to me that you dont have the gears close enough.. but 100 percent on that but a door should never close on it own. It's not safe.

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