THE CRUSHER WAS STOPPED BECAUSE OF A ROCK STUCK IN THE TAIL PULLEY. EMPLOYEE HELPED PRY THE ROCK FROM THE PULLEY AND THEN RESUMED OPERATING THE LOADER UNTIL THE END OF HIS SHIFT. HE NOTICED SO ME STIFFNESS THAT NIGHT AND STATES HE HAD PAIN ON WAKING THE NEXT MORNING. AFTER TWO HOURS OF WORK THE PAIN WAS SO BAD HE COULDN'T CONTINUE & WAS TAKEN FOR MEDICAL EVALUATION.