A wheel assembly 10 for a shaft 30 of a screening machine 1. The wheel assembly 10 comprises a disc 11A, 11B and a first and a second weight unit 12, 13. The first and the second weight units 12, 13 are arranged such that the disc 11A, 11B is in equilibrium along a longitudinal axis passing through the centre of the disc and the longitudinal axis is perpendicular to the diametrical extension of the disc. Also a screening machine comprising a wheel assembly is disclosed.
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