4-35. MAIN GENERATOR BRUSHES (cont)
Check for sticking, broken, or cracked brushes. Check for wear below 1-1/4 inches (38.1 mm). If brushes will
reach 1-1/4 inches (38.1 mm) before next inspection, replace brushes.
Work brushes up and down in brush holders to loosen carbon deposits and other foreign material. Check that
brushes move freely.
Examine brush holders (8) for signs of arcing or binding of brushes.
Check clearance between bottom of brush holder (8) and commutator. Clearance must be 1/16 to 3/32 inch (1.6
to 2.4 mm).
Brushes can be removed and replaced without removing brush holders.
Remove screw (2), lockwasher (3), and flat washer (4).
Unhook spring (5) and raise brush lever (6). Remove brush (7) from brush holder (8).
The brushes are beveled on the bottom of the long end. Install the brushes with bevel fitting the
surface of commutator.
Raise brush lever (6) and install brush (7) in brush holder (8). Hook spring (5) in notch on brush holder. Install
screw (2), lockwasher (3), and flat washer (4).
Check the thickness of the new brush in the holder for a clearance of 0.020 inch maximum inch (0.51 mm).
Brushes with side clearance in excess of 0.020 inch (0.51 mm) will rattle, chip, or break and must be replaced.