A cutting assembly for mounting cutting tips on a mouldboard of a motor grader has a cutter body including a forward mounting face for mounting along a rear face of the mouldboard simultaneously with a continuous blade body supported along the front face of the mouldboard. A row of sockets in the cutter body are arranged to support cutting tips respectively therein. The cutter body is configured to support the cutting tips on the mouldboard such that (i) the cutting tips are raised relative to the lower blade edge of the blade body in a normal working position of the mouldboard, and (ii) the cutting tips protrude below the lower blade edge of the blade body in a cutting position of the mouldboard in which the lower blade edge of the blade body is tilted about the tilt axis upwardly and forwardly in relation to the normal working position.