Graco ULTRA 500 Instructions-Parts List Manual page 22

MOTOR BRUSH REPLACEMENT
Tools Needed: CAUTION
Phillips screwdriver
Flatblade screwdriver
seconds while checking the brushes to avoid
damaging the displacement pump.
Do not run the sprayer dry for more than 30
NOTE: Replace the brushes when they have worn
to no
less
than
112
in. See STEP
1,
Fig
14.
Note that the brushes wear differently on
11.
Reinstall the brush inspection covers, gaskets, and
each side of the motor. Brush Repair Kit
220-349 is available.
screws. Reinstall the motor cover, screws and.
washers.
r w
Before doing this procedure, follow the Pressure
the risk of injection injury, injury from moving
Relief Procedure Warnlng on page 13 to reduce
pam or electric shock. Unp/ug the sprayer/
1. Remove the motor cover (14). See Fig 13.
2. Remove the screw8 (H), inspection covers (J) and
gaskets (K) on each side of the motor. See Fig 13.
3. Push down and then in on the spring clip slightly,
and then pull the clip in and 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.
Have the commutator resurfaced by a
qualified motor repair shop if the brushes
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
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.
Be sura the brush lead does not touch any part of
the armature or motor housing.
ing or gouging.
10.
Test the brushes:
a.
With the ON/OFF switch OFF. turn the
~ . ~ . . ~
~~~~ ~
pressure control knob all the way.counterclock-
wise to minimum pressure. Plug In the sprayer.
b., Turn the ONlOFF &itch 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.
the risk of electric shock and serious bodily injury.
SPRINQ ROLL/
. .
To
remove brush. push
down and In. and then
pull out spring cllp
L!!
\\STEP
Fork
muat
when lnstalllng
hook
holder
To
remove brush. push
down and In. and then
pull out spring cllp
BRUSH
LEAD