24-30-34 Inspection of Contact Ring and Brushes
When brush holder assembly E4A-91-300-000 is removed the contact ring can be inspected.
Check for grooving (>0,5mm) on the contact ring. If grooving (>0,5mm) are 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.
The diameter of the contact ring has to be 15mm (+0 / -2mm).
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