EE REPORTED TO HIS FOREMAN THAT THERE WAS A POTENTIAL PROBLEM WITH THE GIRTH GEAR ON #3 KILN. FIRE WAS NOTICED & EXTINGUISHERS UTILIZED TO PUT OUT FIRE, BUT AFTER FIRE WAS NOT EXTINGUISHED IN 30 MIN, THE LOCAL FIRE DEPT WAS CALLED. THE FIRE DEPT PUT OUT THE FIRE WITH FIRE EXTINGUISHERS.