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

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Pulling mechanisim seems to be jammed

The pulling mechanism which attaches to the garage door moves a couple inches then stops....even with the door not attached. The motor still runs. Motor will not stop until I manually move the mechanism to either end. It seems to be sticking on the track, but I don't know why.

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You have a stripped gear on opener. Take off cover and the bottom will be covered in white shavings. Replace with gear and sprocket assembly

Posted on Jan 18, 2009

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Garage door opener?


Limit switches may need adjusting. If it is a roll up type door, check the coil spring. It is usually mounted on the header above the door frame and will have shafts going out to the right and left with pulleys and cables attached at the outside edges attached to the door itself. The spring is what gives the mechanism the strength to lift the door. If the spring breaks, the motor will not have the power to lift the door completely.

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Garage door moves few inches and stops, springs are fine, sensros are fine.


If it is not blinking when it stops, then the capacitor is blown. Replace the capacitor and it should resolve the problem.

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Check the spring above the door, mine would go up a couple of inches and we found that the spring had broke.

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The torsion springs might need adjustment.

Pull emergency release, and manually lift door to half-open position.

When you release the door, it should stay in place.
If it almost "slams" down, the springs are not doing their job to "balance" the weight of the door itself.
The opener isn't designed to overcome the weight of the unsupported (no spring assist) door.

Over time, the springs take a "set", and might need a readjustment
THIS IS A JOB FOR PROFESSIONALS!!!
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Do you have the users manual of the system with you?Read it and follow the calibration instructions,it may take some trial and error to go through it,buts thats how we do it when we install a new or used garage access system.But of course you have to have some one to work with you cause you might be adjusting some pins or rollers,just an advice.

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First of all I have a question. If you cannot get it to close how do you know it will go up just fine?

All your symptoms and the things you have checked still point to the trolley being jammed against the stop bolt. The fact it will not move even an inch says jammed trolley or the up and down limits are completely misadjusted. Remove the cover from the motor unit and look at the limit switch assembly. Make sure the up and down contacts are not both contacting the center contact.

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listen this door does not sound very strong may need replaced, but a quick fix is go to local lowes or hardware store if door is 10ft wide or less add a piece of 1 inch by 1 inch steel angel the width of door to problem section if it is over 10 ft wide ask help for a u bar strut to brace garage door this will be screwed to inside of door to give extra stability...

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Okay...upon further inspection, my left spring has broken in two. Going to call around for some quotes to replace the spring. Thanks for the suggestions.

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