Ring Gear

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External or internal gear with which the swing pinion on the revolving upper-structure meshes to provide swing motion.

Source: API RP 2D, Operation and Maintenance of Offshore Cranes, Seventh Edition, December 2014. Global Standards

See swing gear (also known as bull gear).

Source: API RP 2D, Operation and Maintenance of Offshore Cranes, Sixth Edition, May 2007. Global Standards

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