What was found
(CAN) PUMP WAS SENT FOR OVERHAUL. INTERNAL INSPECTION REVEALED THAT THE ARMATURE HAD BEEN MODIFIED BY REDUCING THE ARMATURE SHAFT SIZE AND SUBSTITUTING THE ORIGINAL BEARING WITH A COMMERCIAL BEARING THAT HAD THE SAME OUTSIDE DIAMETER, BUT A SMALLER INSIDE DIAMETER,TO ACCOMODATE THE REDUCED SHAFT SIZE. AS THIS WAS THE ONLY MAJOR PROBLEM WITH THIS UNIT, THE ARMATURE WAS REPLACED, THE UNIT O/H AND RETURNED TO SERVICE.