EE WAS INSTALLING AN INSERT BEARING ON THE ROD END OF A STEERING CYLINDER OF A CAT 988F LOADER. HE WAS USING A PIN TO HAMMER THE BEARING INTO THE ROD END. HE STRUCK THE PIN WITH A 20 LB SLEDGE HAMMER. A METAL FRAGMENT CAME OFF THE PIN AND STRUCK HIM IN THE LEFT THIGH. HE WAS EXAMINED BY SUPERVISOR. A SMALL LACERATION WAS OBSERVED WITH SOME REDDENING. HE WAS ADMINISTERED 1ST AID AND