h8375 portable Fume extractor
-25-
during the life of your fume extractor, you may find
it necessary to replace the motor brushes.
Tools Needed
Qty
phillips screwdriver #2 ..................................... 1
Acetone and Cotton rag ................................... 1
Crocus Cloth (From Local Auto parts store) .... 1
Brush set ........................................................... 1
To replace the brushes:
1. unpLug the MAChine!
2. remove the eight motor cover screws and
the cover (
Figure 25).
Motor Brush
Replacement
4. inspect the commutator surface (Figure 27).
—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 (
Figure 27),
use a fine crocus cloth to polish the com-
mutator where the brushes ride.
Finish the cleaning process by using ace-
tone and a cotton rag to wipe off any oils
or contaminants from the commutator.
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.
Figure 26. Brush removal.
Figure 27. Commutator.
3. remove the brush housing retaining screws
and the brush assembly (
Figure 26).
Figure 25. Motor cover.
5. replace the brush assembly and reinstall the
screws and wire.
6. reinstall the motor cover.
Carbon tracking
Motor
Cover
