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

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I have a Sears Craftsman door opener which would not open the door more than a foot off the ground. I turned the adjusting dial for the open(Up) from pos 1 to about pos 3 and the door worked fine...until today. Now the lights come on and the motor runs but the chain drive dooes not move.

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Stripped gears. repair if yu are handy or replace entire unit

Posted on Jan 22, 2009


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Replaced a garage door opener (motor only) will only go downward a foot then back to the up position...tried the force button and the spring adjustment. why wont it work

Try this.

Loosen the chain enough so that you can remove it from the sprocket above the motor unit. With the door closed run the motor until the sprocket turns clockwise and stops. With everything attached replace and tighten the chain. Some adjusting of the up and down limits will probably be required.

Oct 08, 2011 | Sears Craftsman LiftMaster Chamberlain...

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Craftsman 1/s HP 315 MHz garage door opener (Model 139-18470DM). The temperature here is currently 34 degrees celsius with the windchill. When trying to close the garage door from the main switch, the...

Check for some obstacle in the path of the light beam sensor that (should) be installed across the width of the door opening about 3-4 inches off the ground.

Jan 30, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My i/2 hp crafstman chain drive opener stops about a foot from the floor i got it up and noticed the chain was sagging about a foot below the bar how dow I tighten the chain

The adjustment for the chain is on the trolley. That is the part the chain and the door are connected to. Your chain is sagging entirely too much. Have you done any other work to this opener?

Oct 30, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Sears auto garage door opener not opening and closing properly

there are little knobs on the back for adjusting up and down turn them up and you should take care of your problem.

Feb 19, 2009 | Sears Craftsman LiftMaster Chamberlain...

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There are two limit adjustments on the opener. usually the screw show which way to turn if the door needs to be lowered more or raised more. Turn them only about a1/4 turn with each adjustment.

Jan 11, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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Check the connection on your limit assy. Many times people forget to reconnect this.

Jan 02, 2009 | Sears Craftsman LiftMaster Chamberlain...

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Sears sells RAIL EXTENDER KITS for most of thir GDO'S, mostly for residential applications. Go to, type GARAGE DOOR OPENERS in the SEARCH box. The first item that comes up is a 10 foot long GDO extension , item #00953727000, mfr model #53727.

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