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Lift each brush housing out of its seat and
6.
unplug the power wire (see Figure 35).
Figure 35. Brush housing removal.
Slide the brush assembly apart, clean the
7.
housings and brass sleeves with mineral spir-
its, and allow the parts to dry (see Figure 36).
Housing
Sleeve
Figure 36. Brush assembly.
Reassemble the housings with the brass
8.
sleeves and the new carbon brushes (see
Figure 36) and set aside.
Inspect commutator surface (see Figure 37).
9.
Carbon Tracking on
Commutator Surface
Figure 37. Commutator.
-32-
Power Wire
Brass
Carbon
Brush
—If the brushes have worn deep grooves in
the commutator, we recommend replacing
the motor. Typically the labor involved with
re-turning the commutator on a lathe and
then undercutting the insulator segments
far exceeds the price of a new motor.
—If the commutator only has minor wear and
black-colored carbon tracking (see Figure
37), use a fine crocus cloth to polish the
commutator where the brushes ride. DO
NOT use emery cloth or sandpaper to
clean the commutator or you will make
it out-of-round, which will cause the new
brushes to arc, overheat, and wear out
quickly.
Finish the cleaning process by using acetone
and a cotton rag to wipe off any oils or con-
taminants from the commutator.
10. Insert the power wire spade terminal into the
brush assembly between the brass sleeve
and the housing (see Figure 38).
Figure 38. Brush power lead location.
Model G0708 (Mfd. Since 12/23)
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