THE EE HAD MADE SEVERAL ROUNDS WITH HIS 777B HAULER WITH NO MECHANICAL PROBLEMS. AT 9:00 AM THE HAULER LOST ITS RETARDER AND THE EE LOST CONTROLOF THE HAULER. HAULER ROLLED 4 TIMES INTO A VALL EY FIELD. EE SUFFERED A FRACTURE OF THE LEFT THIGH AND NECK INJURIES.