EE WAS REMOVING THE UPPER RADIATOR GRILL FROM A 793B. HE HAD THE OVERHEAD CRANE IN POSITION & SECURED THE GRILL. HE STEPPED ON THE CRANE CONTROL CAUSING THE CRANE TO TROLLEY SOUTH RESULTING IN THE GRILL STRIKING HIM IN THE FACE, THEN FELL FROM THE BUMPER OF THE TRUCK TO THE GROUND. APPROX. 6 FEET.