The present invention relates to a filtering assembly for filtering at least one fluid flowing in particular in a hydraulic motor or device, comprising: —a filter body which comprises a vessel and a cover which are configured to engage with one another in order to enable the filter body to close, —a tube, in particular a central tube, inside the filter body extending along a longitudinal axis (X), —a removable filter cartridge which is housed in the filter body and includes an upper end plate, a lower end plate and a filter medium which extends between the upper end plate and the lower end plate, the filter cartridge having a tubular opening for surrounding the tube, characterized in that the cover has a circular rib which is formed such as to project into an inner space of the filter body, and in that the upper end plate has a circular edge which is designed to sealingly engage radially and inwardly with said circular rib of the cover.