Install an electrical contact brush

TM 9- 2920- 224- 34&P

ASSEMBLY OF THE GENERATOR - CONTINUED

0010 00

e. Install an electrical contact brush (7) into each of six holders (10) as in step d.

Sand brushes for initial seating as follows:

1) Use a strip of sandpaper (11) cut to width of commutator and long enough to cover entire commutator

surface with a slight overlap.

2) Use brush spring lifter hooked in brush lead (12) to raise a brush and slide one end of sandpaper strip

between brush (7) and commutator (13) with grit side toward brush.

3) Fasten sandpaper (11) end to commutator (13) with a piece of tape (14). Rotate electrical end bell (3)

clockwise until sandpaper strip completely covers commutator. Cut off trailing end of sandpaper so a gap

of 1/16 to 1/8 inch will remain between ends of strip. Do not tape trailing end of strip to anything.

4) Rotate electrical end bell (3) clockwise five revolutions.

5) Remove brushes (7) one at a time and inspect brush seat areas of both brush elements for satisfactory

seating. Put each brush back in its holder (10) before removing next brush.

6) If additional seating is required, repeat step (4) with all brushes in place.

7) When all brushes show satisfactory seating, leave last brush (7) out of holder (10) while removing

sandpaper strip. Rotate end bell assembly (3) counterclockwise and lift untaped end of sandpaper strip

(11) away from commutator (13) just after it has passed beneath empty brush holder (10). This method of

removal will prevent distortion of edges on newly formed brush seats.

WARNING

Compressed air used for cleaning purposes will not

exceed 30 psi. Use only with effective chip guarding and

personal protective equipment (goggles/shield, gloves,

etc.).

8) Install brush left out for removal of sandpaper. Remove all sanding dust from commutator and brushes

with compressed air.

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