The present invention relates to an operating method (E) of a hydraulic machine, said hydraulic machine comprising: a housing having a first surface, and a member movable relative to the housing, said member having a second surface in contact with the first surface , the method (E) comprising a step (E1) of setting the member in motion relative to the housing so that a sliding speed of the first surface relative to the second surface is less than 0.5 meters per second, preferably less than 0.3 meters per second, for example less than 0.15 meters per second, said step (E1) of setting in motion being implemented over a time period of setting in motion of which a duration is equal to at least 25% of the duration of a total time period of operation of the hydraulic machine, the first surface and / or the second surface comprising a texturing. Figure for the abstract: Fig. 9
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