57Service Manual – SC900 34 - Scrub System, Disc
10. Remove the terminal screw (J) from the brush wire.
11. Pull the brush (F) outward and remove it from the
brush holder (G).
12. While holding the coil spring out of the way, insert the
new brush into the brush holder. Note that the brush
wire is away from the phenolic base.
13. Re-secure the brush wire to the contact with the screw
(J).
14. After replacing all 4 brushes, retract the brushes away
from the center so the end cap can be placed back over
the commutator without damaging them. In the picture
to the right, note how the brush is retracted far enough
for the coil spring to be pressing against the side of the
brush. This will hold the brush retracted, but can easily
be pushed forward later.
15. Before replacing the end cap, inspect the interior
of the motor:
• Inspect the commutator for missing or
damaged bars. Replace the motor if any of
the bars are missing.
• Inspect the rotor bearing for wear. Replace
the motor if worn.
• Inspect the permanent magnets for metallic
debris and clean off as needed.
16. Place the wave washer (L) in the bearing
pocket (E). Use a Rare Earth magnet (K) on the
opposite side of the cap to hold the washer in
place. (A less powerful magnet can be used, but
a Rare Earth magnet is powerful enough to hold
itself in place.)
17. After reinstalling the end cap, reach in through
the air vents in the motor housing and push
inward on the brushes until you hear them “click”
against the commutator.
Permanent
Magnet
Commutator
Bearing
Rotor
Windings
K
L
E
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