Hitachi 231580 - Manual (Page 20)

20 308715
Motor Brushes
9. Test the brushes.
a. Remove the pump connecting rod pin (17).
See Fig. 18, page 21.
b. With the sprayer OFF, turn the pressure con-
trol knob fully counterclockwise to minimum
pressure. Plug in the sprayer.
c. Turn the sprayer ON. Slowly increase the
pressure until the motor is at full speed.
d. Inspect the brush and commutator contact area
for excessive arcing. Arcs should not trail or
circle around the commutator surface.
WARNING
MOVING PARTS 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 injury.
10. Install the brush inspection covers and gaskets.
11. Break in the brushes. Operate the sprayer for at
least one hour with no load. Install the pump
connecting rod pin. See Fig. 18, page 21.