Motor Brush Replacement - Graco 235-699 Instructions Manual

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MOTOR BRUSH REPLACEMENT
NOTE
1: Replacethe brushes when they have worn to
lessthan1/2in(13mm).RefertoFig17.
Note thatthe brushes weardifferentlyon
each side ofthe motor, so check them both.
Brush Repair Kit 235-727 is available.
r " w A R N ' N G
1
To reduce the risk of serious lnjuty, follow
the
Pressure Relief Procedure Warning on page 19
before doing this procedure. Unplug the sprayeri
1. Remove both inspection covers (A) grid their gas-
kets. See Fig 16.
2.
3.
4.
the brush holder. Pull out the spring clip. See
Fig
Push in the spring clip and release its hooks from
17.
Loosen the brush lead terminal screw. Pull the
brush lead away, but leave the motor lead termi-
nal in place. Remove and discard the brush. See
Fig 17.
Inspect the cornmutator for excessive pitting,
tator is normal. Have the cornmutator resurfaced
burning or gouging. A black color on the'commu-
by a qualified motor repair shop
if
the brushes
seem to wear too fast or arc excessively.
5.
Repeat for the other side.
CAUTION
When installing the brushes, follow all steps
carefully. Improper installation damages parts
beyond use.
6.
7.
8.
9.
to the fan-end ofthe motor. Slide the terminal under
Place a new brush in the holder so the lead is closer
the terminal screw washer. Ensure the motor lead is
still connected at the screw. See Fig 17.
Holding the spring/cllp at'a slight angle, slide the
the end of the holder. See Fig 18. Pull on the
spring/clip Into the brush holder and hook
it
over
spring/clip to be sure
it
stays in place. Be sure the
brush lead is tucked under the spring/cllp tab.
Repeat for the other side.
Test the brushes.
a. Wlth the sprayer
OFF,
turn the pressure control
sure. Plug in the sprayer.
knob fully counterclockwise to minimum pres-
b. Turn the sprayer
ON.
Slowly increase the pres-
sure until the motor is at f u l l speed.
c. Inspectthe brush and commutator contact area
for excessive arcing.
Arcs
should not "trail" or
circle around the commutator surface.
WARNING
I c
Do not run the sprayer dry for more than
30 sec-
onds while checking the brushes to avoid dam-
aging the displacement pump packings.
I O . Install the brush inspection covers and gaskets.
HOOK,
TERMINAL SCREW
BRUSH
LEAD'
/
Fig 17
Fig
18
20
308-248