EMPLOYEE WAS WORKING ON 988F LOADER. EMPLOYEE CRAWLED BETWEEN TIRE AND BODY OF MACHINE TO WELD ON HYDRAULIC TANK BRACKET, (IN AN AWKWARD POSITION), WHEN HE NOTICED HIS LEFT HAND GOING NUMB. MR I SHOWED THAT THE EMPLOYEE HAS HERNIATED DISC. (PLEASE SEE ATTACHED LETTER, GIVING MORE DETAIL.)