Motor Brush - Graco 231–034 Instructions And Parts List

Motor Brush Replacement
NOTE: Replace the brushes when they have worn to
about 1/2 inch (10 mm) in length. Check both of the
brushes. A Brush Repair Kit, part number 220–853,
and a new spring clip, part number 110–816, may be
purchased separately.
NOTE: The replacement brushes may last only half as
long as the original brushes. To maximize the life of the
brushes, operate the sprayer for at least one hour with-
out allowing the pump to stroke. See Steps 10 to 12.
WARNING
To reduce the risk of a serious injury, follow the
Pressure Relief Procedure on page 4 whenever
you are instructed to relieve the pressure.
1. Relieve the pressure.
2. Remove the shield (14). Remove the covers (A)
from both brush inspection ports. See Fig. 11.
14
A
Fig. 11
3. Push in the clip (D) to unhook it, and then pull out
the clip. See Fig. 12.
4. Loosen the screw (F). Pull away the brush's elec-
trical lead (E), leaving the motor's electrical lead
(G) in place. Remove the brush (C) and the spring
(B). See Fig. 13.
5. Inspect the motor's commutator for excessive pit-
ting, burning or gouging. A black color on the com-
mutator is normal. If the brushes seem to wear too
quickly, have the commutator resurfaced by a
qualified motor repair shop.
6. Install the new brush (C) so its electrical lead is in
the long slot (K) of the brush holder (H). Slide the
terminal of the brush's electrical lead (E) under the
washer of the screw (F). Make sure the motor's
electrical lead (G) is still connected the at the
screw. Tighten the screw (F). See Fig. 14.
7. Place the spring (B) on the brush (C) as shown in
Fig. 14.
8. Push in the clip (D) and hook it. See Fig. 14.
9. Repeat this procedure for the other side.
10. Test the brushes.
a. Remove the connecting rod pin (20) only. See
page 36.
b. Turn off the sprayer. Turn the pressure–control
knob to the minimum setting. Plug in the
sprayer.
c. Turn on the sprayer. Slowly increase the pres-
sure until the motor is at the full speed.
d. Inspect the contact area of the brush and the
commutator. The arcs should not circle around
the commutator surface.
CAUTION
Do not touch the brushes, leads, springs, or brush
holders while the sprayer is plugged in, to reduce
the risk of an electric shock and a serious injury.
11. Install the brush inspection plates, the gaskets,
and the covers.
12. Operate the sprayer for at least one hour. Then,
install the pump connecting rod pin. See page 36.
B
Fig. 12
B
C
Fig. 13
The spring must coil in
this direction.
The minimum brush
length is 1/2 inch
(10 mm)
Fig. 14
C
D
01227
D
E
F
G
01227
H
J
C
B
D
01227