EMPLOYEE WAS INSTALLING A HYDRAULIC CYLINDER ON A CAT SCRAPER IN OUR MAINTENANCE SHOP. HE ALLEGES THAT A PRY BAR HE WAS USING TO INSTALL THE CYLINDER SLIPPED CAUSING A STRAIN ON HIS LEFT SHOULDER. THE INCIDENT WAS NOT REPORTED TILL 10/11/04. hE WAS RELEASED TO WORK WITH NO RESTRICTIONS. EE HAD SURGERY ON 2/15/05 MAKING THIS INJURY REPORTABLE.