EMPLOYEE WAS RUNNING MOXY HAUL TRUCK, STEERING WHEEL JERKED, JAMMED HIS RIGHT SHOULDER. EE WAS OPERATING THE MOXY ARTICULATED HAUL TRUCK MOVING WASTE MATERIAL AT PLANT 2. THE ROADS HE WAS TRAV ELING ON ARE RELATIVELY LEVEL AND THERE IS SOME HEAVY RUTTING AT THE DUMP SITE. WHILE TURNING NEAR THE DUMP SITE THE WHEEL JARRED SUDDNELY, AND EE JAMMED HIS SHOULDER AS A RESULT.