Inspection (All Models)
Wash all metal parts except bearings, stator, and rotor. Inspect rotor slip rings and clean with 400 grit or finer polishing cloth. Hold cloth against slip rings and spin rotor to clean evenly. Avoid producing flat spots. Slip rings may be lathe turned .002" (.05 mm) undersize. Slip rings are not replaceable. Excessive damage will require rotor replacement. Inspect brushes for wear. Clean with acetone if necessary. Replace brushes if excessively worn.