Electrical Maintenance 8-8
Inspecting and Diagnosing Components
Brushes
1. Inspect the brush assembly. The original brush set may be reused if the brushes are 4.8 mm or longer and if the brushes are
not oil soaked, cracked, or show evidence of grooves on the sides of the brushes caused by vibration.
2. Check the brushes with a continuity tester.
Brush Test
1. Remove and replace the O-ring in the bearing bore of the rear housing if needed.
2. Inspect the rear housing for a cracked or broken casting, stripped threads, or evidence of severe wear in the bearing bore due
to a worn rear bearing.
Front Housing
1. Inspect the front housing for cracks. Check the condition of the threads of the adjusting boss.
2. Check the bore in the mounting boss. Discard housing if bore shows signs of elongation (oval or out of roundness).
Stator Lead Connection
1. Diode Plate
2. Stator
3. Three (3) Leads
Brush Test
Continuity:
From A to B
From C to D
No Continuity:
From A or
B to C or D
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