THE ARTICULATED TRUCK WAS HAULING DIRT WHEN THE FRONT PIN ON THE RIGHT STEERING CYLINDER CAME OUT & THE TRUCK TURNED SHARP TO THE LEFT ROLLING THE BOX OVER & WENT OVER AN 8' EMBANKMENT. THE DR IVER SUSTAINED SOME CUTS ON HIS LEFT ARM AND ELBOW AREA FROM THE GLASS OF THE DRIVER'S DOOR. THECAB DID STAY UPRIGHT.