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Why won't my garage door opener gear and chain move when the motor is engaged?

Craftsman door opener 139.536735RT. Motor is working but won't open or close the door. I can manually open and close the door. Lights are working. Gear and chain won't move when motor is engaged.

1 Answer from this member:
Manage My Life
by Manage My Life
February 7th, 2008
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