EE WAS OPERATING A DOZER IN THE ORE BARN. THE RIGHT SIDE COVE ON THE ENGINE CAME LOOSE AND STARTED TO HIT THE RIGHT TRACK. HE STOPPED TO ADJUST THE COVER. USED A PICK AS A PRYBAR. HE COMPLAINE D OF BACK PAIN WHILE LIFTING THE PICK. WAS EVALUATED BY A DR. & TAKEN OFF WORK.