INJURED, ALONG WITH OTHER CO-WORKERS PULLED DISCHARGE BEARING COVER AWAY HANGING ON CHAIN FALL.LIFTED BEARING. MADE INSPECTION(VISUAL). PUT BEARING BACK AND ROLLED TO BOTTOM. BEARING ROLLED QU ICKLY AND INJURED HAD HOLD OF EYE BOLT WITH SHACKLE WHEN HAND WAS PINCHED BETWEEN BEARING AND CAP DURRING ROTATION.