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

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Model 139.53930DM I adjusted the chain and now door only goes up 12" (too tight?)

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The chain might be to tight but I think you should check for broken door springs or a bad drive gear. The gear is white nylon and is just in front of the motor. The chain should sag just a bit.

Posted on Sep 28, 2009

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Posted on Jan 02, 2017

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1 Answer

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If the main light flashes 10 times when the door goes back up it is a door sensor problem. You chain should sag just a little. If you tighten it too much it will click as it goes over the sprocket. You can increase the down force which is an adjustment near where all those white wires go. A 1/4 turn should be enough. Release the door from the opener and operate it by hand. It should move freely and when you have the door approximately waist high it should stay put. Neither raising nor closing.

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1 Answer

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There are two white screws on the sides that adjust the limits. Adjust the "down" screw less. You should have to turn the screw 4 full turns for eight inches. After you make this adjustment, test it without the door being hooked up to prevent damage to the door or opener if it tries to close too far.

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Sears opener wont open or close more than 12 inches


You may have put the chain back on out of "sync" with in internal up and down stops. You may have to take the chain off the motor sprocket and run the motor to make sure it is stopped in the down position ( watch the rotation of the sprocket to determine up or down position) When the motor is stopped in the down position put the chain back on with the chain Carriage in the down position. Then you can fine tune the up and down stop positions with the adjustment screws on the side.

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1 Answer

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if you changed gears, you may have chain out of sync. read instructions with gear kit on how to sync chain.

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