EE WAS REMOVING A TRANSMISSION PUMP ON A 773B HAULER IN A SLIGHTLY ENCLOSED AREA. THE PUMP UNEXPECTEDLY BROKE FREE AND STRUCK HIM IN THE LEFT THIGH. INITIALLY HE REFUSED MEDICAL TREATMENT BUT THREE WEEKS LATER HIS LEG WAS SORE AND HE REQUESTED TO GO TO THE DOCTOR. DR RELEASED HIM TO REGULAR DUTY BUT PUT HIM ON LIGHT DUTY AFTER SECOND FOLLOW UP.