WHILE SHOVING WITH A D11R DOZER, A ROCK ROLLED UNDER THE BLADE & THE LEFT TRACK ROLLED ONTO THE ROCK. THE DOZER SLID OFF OF THE ROCK, CAUSING A SUDDEN FORWARD MOTION TO THE EE, RESULTING IN AN INJURY TO HIS LEFT SHOULDER & NECK. THE EE CONTINUED TO WORK WITH NO MEDICAL TREATMENT UNTIL 4/5/04 - AT THIS TIME INCIDENT BECAME REPORTABLE.