EE CLAIMS THAT HE BEGAN HAVING LOWER BACK PAINS AFTER HE GOT HOME AFTER HE HAD DRIVEN A 1998 CASE FRONT END LOADER MODEL 621B ALL DAY. HE CONTINUED TO OPERATE THIS MACHINE DAILY UNTIL 4-3-02 W HEN THE PAIN BECAME UNBEARABLE. HE WAS TREATED TAT PRO MED CLINIC AND RESTRICTED FROM DUTY UNTIL 4/8/02 AT WHICH TIME HE WAS RELEASED TO FULL DUTY.