Abstract: The present machine shed sliding door operator utilizes a gear and motor arrangement which rides back and forth with the machine shed sliding door when the sliding door is flopped back and forth against the shed by wind. The gear and motor arrangement slides in a stationary frame rigidly affixed in an upper corner of the door frame and continuously brings pressure to bear on a gear rack set in the door. A continuous meshing pressure on the gear rack by the gear arrangement is created by coil springs continuously pushing the gear arrangement against the gear rack.