THE INJURED AND ANOTHER EE WERE CHANGING A TRAM MOTOR ON A SHUTTLE CAR. THE NEW TRAM MOTOR WAS BROUGHT TO THE SHUTTLE CAR IN THE BUCKET OF A SCOOP AND THE EE WAS PUSHING ON THE TRAM MOTOR TO T URN IT AROUND WHEN HE FELT A SHARP PAIN IN HIS BACK. THE EE CONTINUED TO WORK HIS REGULAR JOB THRU 8-24-01 AND WENT TO A DR AFTER HIS REGULAR SHIFT DUE TO TO WORK HIS REGULAR JOB THRU 8/24/01