On most Genie screw drive openers, the motor shaft is connected to the rail screw with a coupler. This allows the motor to turn the screw, which moves the trolley to open and close the garage door.
Sometimes the coupler wears out, and the motor will turn, but the screw doesn't turn. As a result, the door does not open nor close.
This tutorial demonstrates how to replace a 30257T coupler in a Genie screw drive opener.
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