Abstract: A planetary hydraulic motor comprises a housing (1) with a stator gear (2), the housing accommodating a shaft (3) having fixedly secured thereon a gear (4), a ring rotor (11) disposed eccentrically relative to the shaft (3) and two cover cups (5 and 6). The shaft (3) has a sealing assembly in the form of a thrust ring (7) secured in the cover cup (5) and a sleeve (8) having a cylindrical projection adjoining by the end face thereof the working surface of the thrust ring (7). Mounted on the outer surface of the cylindrical projection of the sleeve (8) is a ring element (20) fabricated from an elastic material. Provided in the sleeve (8) essentially under the ring (20) are passages (21) adapted to communicate a section of the inner surface of the ring (20) with the atmosphere.