CHECKING CARBON BRUSH
If the brush become excessively worn, its contact pressure with the slip ring changes and causes a roughened surface on the slip ring, resulting in irregular generator performance.
Check the brush every 500 hours or if generator performance is irregular.
If the brush is 0.2 in.(5 mm) long or less, replace it with a new one.
(a)Remove the brush cover.
(b)Disconnect the wire connector and remove the brush.
(c)Carefully note the brush direction and relative position with the slip ring when installing new brush.
BRUSH
HOLDER 
15 to 5 mm
(0.6" to 0.2")
BRUSH
BRUSH
HOLDER
FLANGE BOLT
SCREW
BRUSH
COVER
