Motor Brushes
NOTE: Replace brushes when worn to about 12.5 mm
(0.5 in.). Always check both brushes. Brush Repair Kit
236–967 is available for motor brush repair.
NOTE: Replacement brushes may last only half as
long as the original ones. To maximize brush life, break
in new brushes by operating the sprayer with no load
as instructed in this procedure.
NOTE: To minimize down time, and for best sprayer
performance, check motor brushes and clean trans-
ducer (see page 28) whenever pump is repacked.
WARNING
INJECTION HAZARD
To reduce the risk of serious injury, when
instructed to relieve pressure, follow the
Pressure Relief Procedure on page 8.
1.
Unplug sprayer.
2.
Remove both inspection covers (A) and their
gaskets. See Fig.14.
7842A
Fig. 14
A
3.
Push in spring clip (F) and release hooks (G) from
brush holder (B). Pull out spring clip. See Fig. 15.
4.
Inspect commutator for excessive pitting, burning or
gouging. A black color on commutator is normal.
Have commutator resurfaced by a qualified motor
repair shop if brushes seem to wear too fast or arc
excessively. See Step 9.d., also.
5.
Repeat for other side.
6.
Place a new brush (C) in holder (B) so ramp (H)
faces spring. See Fig. 15.
7.
Holding spring clip (F) at a slight angle, slide spring
clip into brush holder and hook it over end of
holder. See Fig. 16. Pull on spring clip to be sure it
stays in place. Connect brush lead to blade con-
nector (E).
8.
Repeat for other side.
9.
Test brushes.
a.
Remove pump connecting rod pin (14).
WARNING
ELECTRIC SHOCK HAZARD
Do not touch the brushes, leads, springs
or brush holders while the sprayer is
plugged in to reduce the risk of electric
shock and serious bodily injury.
b.
With sprayer OFF, turn pressure control knob
fully counterclockwise to minimum pressure.
Plug in sprayer.
c.
Turn sprayer ON. Slowly increase pressure
until motor is at full speed.
d.
Inspect brush and commutator contact area for
excessive arcing. Arcs should not trail or circle
around commutator surface.
10.
Install brush inspection covers and gaskets.
11. Break in brushes. Operate sprayer for at least
one hour with no load. Install pump connecting rod
pin.
Fig. 15
F
G
E
D
C
B
H
1
1
Motor lead; do not disconnect
2
Minimum 12.5 mm (.5 in.)
2
03881
Fig. 16
1
G
C
E
F
