The invention relates to a rotary lobe pump (1) comprising a housing (2) enclosing a chamber (3), rotors (10) positioned in the chamber and at least one curved radial wearplate (13) positioned in the chamber between a rotor and a wall (4) of the housing the wearplate being removable without requiring any displacement of the rotor. The invention further relates to a radial wearplate (13) and to a method for removing said wearplate (13) from the pump (1). The wearplate (13) comprises a surrounding edge (17 - 20) with straight and curved parts and a protrusion (21) which is situated along part of the edge (17 - 20). A force is applied to the wearplate (13) to move the wearplate (13) from a first position between the rotor (10) and the wall (4), in a direction parallel to a rotor axis (14) , to a second position whereby an empty space between the rotor (10) and the wall (4) is created. During the removal process the rotor (10) remains in a static position.
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