EE WAS WORKING ON REMOVAL OF #75 SUPPORT SHAFT. WHILE HANDING OUT A 3/4 TONE COMEALONG TO HIS PARTNER, EE LIFTED HIS HEAD AND BUMPED HIS HARD HAT ON #53 SUPORT SHAFT SOUTH WHEEL. HE WAS EVALUA TED BY A PHYSICIAN ON 5-2-02 AND WAS REFERRED TO A CHIROPRACTOR.