Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+ Logo
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Anonymous Posted on May 15, 2010

Motor will just slightly activate and than stopmoving slightly each time but will not move door open or close. The chains and cable are not bound up. I unhooked the chain assembly and the motor sprocket still will not move

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  • Master 3,197 Answers
  • Posted on May 17, 2010
Anonymous
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Remove the cover from the motor unit and check the drive gear. It is a white nylon gear just in front of the motor and may be stripped.

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