EMPLOYEE HAD BEEN OPERATING A 10 YARD ENDLOADER THAT HAD A PROBLEM WITH THE ""SOFT SHIFT"". THIS CAUSED THE MACHINE TO JERK MORE THAN NORMAL WHEN SHIFTING FROM FORWARD TO REVERSE AND VICE VERSA. OVER A PERIOD OF SEVERAL DAYS, THIS CAUSED THE EMPLOYEE'S BACK TO HURT. HE SAW PHYSICIAN ON 9/15/03 AND RECEIVED OSTEOPATHIC MANIPULATIVE TREATMENT.