WHILE MOUNTING A CATERPILLAR D-10 DOZER, THE OPERATOR'S RIGHT FOOT SLIPPED OFF THE STEP ON THE TILT CYLINDER, CAUSING HIM TO FALL STRIKING HIS LEFT SIDE ON THE TILT CYLINDER AND TRACK BEFORE H ITTING THE GROUND. THE EMPLOYEE WORKED UNTIL 11/9/02. HE BEGAN LOST TIME ON 11/11/02.