THE DRIVER WAS ATTEMPTING TO PULL OUT A METAL GRATE FROM THE ROLL FEED DUMPING STATION. THE GRATE WAS APPROX. 20"" X 36"". WHILE PULLING THE GRATE OUT, IT CAUGHT ON THE EDGE AND THE DRIVER FELT PAIN IN HIS LEFT SHOULDER. HE WAS DIAGNOSED WITH A STRAIN AND IS RECEIVING OCCUPATIONAL THERAPY. HE WAS NOT GIVEN RESTRICTIONS TO PREVENT HIM FROM DOING HIS REGULAR JOB.