INJURED UNLOADED SYN-GAP AND DROVE AWAY FROM PUMP ZONE, BUT RETURNED TO SPOT THE LOAD FOR HIS PARTNER. IN DOING SO, HE APPROACHED THE WORKING FRONT END LOADER FROM THE REAR. THE PARTNER SOUNDE D HIS AIR HORN AND THE FRONT END LOADER OPERATORSTOPPED. THE MAN ATTEMPTED TO PUSH AWAY FROM THETIRE, MAY HAVE SLIPPED AND CONTACTED THE TIRE.