EMPLOYEE WAS GREASING THE WATER PUMP ON THE 65 TON KOMATSU HAUL TRUCK. HIS RIGHT FOOT WAS ON THE A FRAME GOING TO THE WHEEL, HIS LEFT FOOT WAS ON THE 2"" LIP ON THE RADIATOR SUPPORT BRACKET. H IS FOOT SLIPPED AND HE FELL 30"" TO THE GROUND LEVEL STRIKING HIS SHOULDER ON THE FRAME OF THE TRUCK. HE SUFFERED A CONTUSION TO THE LEFT SHOULDER.