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Operation, Maintenance


Online Inspection, Offline Inspection, Brush Replacement


Outlines the online and offline inspections to perform when replacing or performing maintenance on brushes and brush holders

Inspecting a Brush Holder

Online Inspections

It is normally not necessary to remove a brush holder for inspection prior to changing a worn brush. Watch for the following indicators of a problem:

  • Inspect for arcing from the trailing edge of the brush.

  • Inspect for discolored brush leads.

  • Use a strobe to inspect for brush photographing (imaging) on the ring.

The frequency of inspections is unit specific and ranges from every day to once per week.

Offline Inspections

When the brush holder is removed, complete these inspections to ensure that the brush holder is in proper working condition:

  • Inspect the brush holder for any signs of wear or damage as well as any excessive build up of dirt or foreign material.

  • Check for any cracking or breakage of components or welds.

  • Ensure the brush catch is holding the brush in the brush box when the brush holder is disengaged from its mount.

  • Confirm the “snap in” pressure when installing or removing the brush holder is relatively equal to the other brush holders.

  • After the brush has been removed, inspect the sides of the brush for any signs of restrictions such as scrapes or drag marks.

  • Inspect the inside of the brush box for obstructions such as box deformity, burrs, or carbon deposits. Clean the box using denatured alcohol. Remove carbon deposits using a plastic or wood object. Avoid using sharp objects or abrasive cleaners as these could damage the interior of the brush box.

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