Arrival time of 1130am. Replace gearbox on a dks barrier arm. Adjusted the limits so they stop at level and 90°. Ran it about 40 times no more issue as it used to do it every other time. Got adjustments to have opening position stop at the 6 o'clock position and no extra travel. The extra travel could be result of gate having no counter balance or motor mount and bushings wearing down. Its no traveling extra anymore now that the play in the gearbox are gone. Departure at 240pm.