The invention relates to a support device for a mobile crane with at least one support cylinder which can be extended and retracted in the vertical direction, the bottom end of which is provided with a spherical cap which, in the support position, is articulated in a spherical seat of a support plate, the spherical cap in a T-slot -Rail running rail of the support plate is guided displaceably transversely to the longitudinal axis of the support cylinder in order to move the support plate between a support and transport position relative to the support cylinder, characterized in that at least one plastic element is introduced at least in sections in the running rail to allow for the vertical play of the dome to reduce within the T-slot of the track.
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