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

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Have replaced drive gear on Craftsman GDO. Everthing engages and chain moves but door only opens 3 inches are so. Have ajusted opening cointrol on side to max and only 3 inches. When I unlatch GD from trolly, move on track but only part way does not move to end of track stay in middle of track. Please help.

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Loosen the chain enough that you can remove it from the pulley on top of the motor unit. Now with the door closed run the motor until the pulley turns in the clockwise direction and stops. Put the chain back on the pulley and tighten. You may have to tweak the up and down limits now.

Posted on Nov 14, 2009

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