Hitachi 231580 - Manual (Page 19)

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Motor Brushes
NOTE: Replace brushes when worn to about 0.5 in.
(12.5 mm). Always check both brushes. Brush Repair
Kit 236967, which includes spring clip 112766, is
available for motors manufactured by Pacific Scientific.
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 for at least
one hour with no load (remove the pump connecting
rod pin).
WARNING
INJECTION HAZARD
To reduce the risk of serious injury,
whenever you are instructed to relieve
pressure, follow the Pressure Relief
Procedure on page 9.
1. Remove both inspection covers (A) and their
gaskets. See Fig 14.
Fig. 14
A
04653
2. Push in the spring clip (F) and release its hook (G)
from the brush holder (B). Pull out the spring clip.
See Fig 15.
3. Slide off the brush lead terminal (E) off the blade
connector. Remove the old brush (C). See Fig 15.
Fig. 15
F
G
E
D
C
B
H
1
1
Motor lead; do not disconnect
2 Minimum 0.5” (12.5 mm)
03881
3 Included in Brush Repair
Kit 236967
3
2
4. Inspect the commutator for excessive pitting,
burning or gouging. A black color on the commuta-
tor is normal. Have the commutator resurfaced by
a qualified motor repair shop if the brushes seem
to wear too fast or arc excessively. See Step 9.d.,
also.
5. Repeat for the other side.
NOTE: The motor brushes on the other side are
upside down.
6. Place a new brush (C) in the holder (B) so the
ramp (H) faces the spring. See Fig. 16.
Fig. 16 03881
1
G
C
E
F
7. Holding the spring clip (F) at a slight angle, slide
the spring clip into the brush holder and hook it
over the end of the holder. See Fig. 16. Pull on the
spring clip to be sure it stays in place. Connect the
brush lead to the blade connector (E).
8. Repeat for the other side.