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

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Garage door opener does not work correctly

I have a craftsman half horse power garage door opener that only opens six to twelve inches most of the time, and some time i works great. the make and mdl# Sears craftsman 1/2 hp md-139.53672SRT
Can you help?


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  • jz-ct Feb 23, 2008

    Same problem- both doors only open appx. half-way. The issue started with one door and the second door began having the same problem about 4-weeks after the first. Tried the limits and travel adjustments without and luck. I asked Sears but the only suggestion they had was to send a repair crew out at big $'s. It will probably be cheaper to buy a new (different brand) opener. Any help would be appreciated.

  • Anonymous Dec 19, 2008

    I'm having the same problem door opening halfway need help.

  • bigallf Dec 19, 2008

    Does anyone have any idea why the garage doors only open a few inches or in other cases only halfway.

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Make sure the door springs on the door are ok.Unhook the opener from the track by pulling the red handle rope on the track,make sure the door moves up and down freely.There is a up-force adjustment on the end of the opener that the small wires run to,you will see 2 slotted adjuster screws,find the one labeled up force,turn it clockwise a little bit(1/16th of a turn).Also there is a plastic gear inside the case that gets dry,unplug the opener,remove the 8 screws that hold the case on and lube it with a lithium grease,see if it is worn badly while you have the case off.

Posted on Aug 12, 2009

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