EE WAS PULLING A FORD F700 SERVICE RUCK'S HYDRAULIC HOSE FROM THE FRONT OF THE TRUCK TO THE BACK WHEN HE FELT A POP IN HIS CHEST. THERE WAS ONLYA SMALL DEGREE OF DISCOMFORT INITIALLY SO HE REPORTED IT TO HIS SUPERVISOR BUT INDICATED IT WOULD BE O.K. AND RETURNED TO WORK. FIVE DAYS LATER THE DISCOMFORT RETURNED AND HE WAS TAKEN TO HOSPITAL TREATED FOR STRAINED RIBS.