Abstract: A lubricator for large diameter open gearing utilizes a header having a series of orifices which direct streams of oil onto a deflector plate which produces a spray directed at the teeth of a drive pinion in close proximity to the point of first engagement on the approach side of the pitch point. Air turbulence generated by movement of the gear teeth is prevented from affecting the spray pattern by utilizing a collector for excess lubricant as a baffle and by utilizing the deflector plate to block the movement of air. Uniformity of spray pattern from the orifices is enhanced by providing a pressure relief valve remote from the feed points of the header.