Graco ULTRA 1000 Instructions-Parts List Manual page 22

MOTOR BRUSH REPLACEMENT
Tools Needed:
Phillips screwdriver
Flatblade screwdriver
NOTE:
Replace the brushes when they have worn
to no less than 112 in. See STEP 1, Fig 14.
each side of the motor. Brush Repair Kit
Note that the brushes wear differently on
220-349 is available.
1. Remove the motor cover (14). See Fig 13.
2.
Remove the screws
(HI,
inspection covers (J) and
gaskets (K) on each side o f the motor. See Fig
13.
3. Push down and then in on the spring clip, and then
pull the clip out of the brush holder. Refer to STEP
3,
Fig 14. Keep the spring clip.
4. Loosen the brush lead terminal screw and remove
the lead.
5.
Remove and discard the brush.
6. Inspect the commutator for excessive pitting, burn-
NOTE:
A black color on the commutator is normal.
qualified motor repair shop if the brushes
Have the commutator resurfaced by a
seem to be wearing too fast.
7. Place a new brush in the holder
so the lead is at the
top of the holder. Place the brush lead terminal on
ing or gouging.
the terminal screw so the terminal is parallel with
the brush holder. Tighten the terminal screw. See
STEP 1, Fig 14.
8. With the spring roll touching the brush, push the
forked end of the spring clip into the brush holder.
the end of the holder, push the clip up or down until
See STEP 2, Fig 14. When the fork passes through
the fork hooks the end of the holder. See STEP 3,
Fig 14.
9. Position the brush lead as shown in STEP 3,
Fig 14.
the armature or motor housing.
Be sure the brush lead does not touch any part of
a. With the ON/OFF switch OFF, turn the
wise to minimum pressure. Plug in the sprayer.
pressure control knob all the way counterclock-
b. Turn the ON/OFF switch
ON
and slowly in-
full speed.
crease the pressure until the motor comes up to
c. Inspect the brush and commutator contact area
for excessive arcing. Arcs should not "trail" or
circle around the commutator surface.
10. Test the brushes:
Fig 13
A H O L D E R 1 I
1 .
TOP OF
\
-ENDOFMOTOR
STEP 1
STEP 3
Fork
must
hook
To rsmove brush
push down and In.
Fig 14
CAUTION
Do not run the sprayer dry for more then
30
seconds while checking the brushes to avoid
damaging the displacement pump.
11. Reinstall the brush inspection covers, gaskets, and
washers.
screws. Reinstall the. motor cover, screws and
i
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307-7s