Mobile turner for compost heaps with a vehicle chassis and a turning roller rotating around a horizontal transverse axis, which is provided on the circumference with one or more throwing shovels for receiving and throwing up the compost heaps, with at least one wear part on at least one of the contact surfaces of the throwing shovels with the compost material by means of at least one Screw is detachably attached, characterized in that one screw end is countersunk in the tightened state within the wear part.
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