EE HAD JUST SWITCHED SLURRY INJECTION PUMPS. WHEN EE WAS REMOVING A TORQUE ELIMINATOR FROM THE SUCTION VALVE OF 2 AND 4 INJECTION PUMPS, HE FELT A PULL IN HIS LEFT SHOULDER. MEDICAL SENT EE TO OUR LADY OF THE LAKE ASCENSION FOR TREATMENT. INITIALLY, THIS INJURY WAS CLASSIFIED AS A FIRST AID -- RECLASSIFIED TO RESTRICTED 4/14/03.