24-31-34 Inspection of Contact Ring and Brushes
When Brush Holder Assembly E4A-91-410-000 is removed, the contact ring can be inspected.
Check for grooving (>0,5mm) on the contact ring. If grooving (>0,5mm) is visible, the alternator
must be replaced.
Grooving (<0,5mm) caused by abrasion of carbon brushes are acceptable.
Clean the contact ring with a soft brush.
Do not use a steal brush for cleaning to avoid any damage.
Fig. 24 - 33 Contact ring
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