Graco ULTRA 1000 Instructions-Parts List Manual page 22

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MOTOR BRUSH REPLACEMENT
Tools Needed:
Phillips screwdriver
Flatblade screwdriver
NOTE:
Replace the brushes when they have worn
to no less than 1/2 in. See STEP 1, Fig 14.
Note that the brushes wear differentlv on
each side of the motor. Brush Repai; Kit
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 of the motor. See Fig 13.
3. Push down and then in on the spring clip, and t h & i
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.
ing or gouging.
7. Place a new brush in the holder so the lead is at the
the terminal screw so the terminal is Darallel with
top of the holder. Place the. brush lead terminal on
the brush holder. Tighten the terminai 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 armeture or motor housing.
Be sure the brush lead does not touch any part of
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 switch
ON
and slowly in-
full speed.
crease the pressure until the motor comes up to
10. Test the brushes:
c. Inspect the brush and commutator contact area
for excessive arcing. Arcs should not "treil" or
circle around the commutator surface.
Do not touch the brushes, leads, springs or brush
WARNING
the risk of electric shock and serious bodily injury.
holders while the sprayer is plugged in to reduce
FIR 13
..
BR
/I
/.
STEP 3
-Fork muat hook
holder when
lnetalllng
4 1 \
1 - 1 0 remove brush
then pull out
pueh down and In,
sprlng cllp
Fig 14
CAUTION
Do not run the sprayer dry for more than 30
seconds while checking the brushes
to
avoid
damaging the displacement pump.
11. Reinstall the brush inspection covers, gaskets, and
screws.
Reinstall
the motor cover. screws and
washers.
22
307-785