If conductive particles short the areas around the commutator risers, what maintenance action is typically required?

• A. replacement of brushes
• B. removal of the armature
• C. rewinding the armature
• D. cleaning the housing

Answer: (B)

When conductive particles short around the commutator risers, you need to access and clean the interior of the armature to remove the debris and inspect for damage. Removing the armature lets you reach into the commutator slots, physically clean out particles, check for insulation wear, and verify that there aren’t damaged bars or risers. Cleaning the housing alone won’t reach the inside where the shorts are happening, and simply replacing brushes doesn’t address debris lodged around the risers. Rewinding the armature is only needed if the windings or commutator segments are damaged after inspection. So the standard maintenance action is to remove the armature to thoroughly clean and inspect the commutator area.