The invention relates to mechanical engineering, in particular to a mechanical gear transmissions, and may be used advantageously in the drive rotation for rotating tower crane metal and cargo. The technical result of the claimed device is the elimination of oil leak from the gear by applying a two-stage sealing assembly circuit driven shaft seal. Reducer rotation mechanism tower crane comprises a housing 1, lead 2 and the driven rollers 14 to the sun gears 3 and 16, the driven shaft 14 is mounted on the upper 18 and lower 19 mounts and the carrier 11 with mounted on axles 10 dvuhventsovymi pinion gear 7. The applied step scheme sealing driven shaft seal assembly 14 providing for the installation of one cuff 20 to the lower bearing 19 of the driven shaft 14 and the dual cuff 21 - 19 under said support.
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