Chapter 9 Electrical System
_4_.
_A_Jt_e_rn_a_t_o_r
___________________________
3.4JH3(B)(C)E
3) Rotor coil insulation test
Check
the
continuity between the slip ring and the
rotor core, or the shaft.
If
there is continuity, insulation
inside the rotor is defective, causing
a short with the
earth circuit. Replace the rotor coil,
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4)
Check the rear side ball bearing.
If
the rotation of the
bearing
is
heavy,
or
produces
abnormal
sounds,
replace the ball bearing.
(3} Stator
1) Stator coil continuity test
Check the continuity between each terminal of the sta-
tor
coil.
If
there is no continuity, there is a wire break
in
the stator coil. Replace the stator coil.
Resistance value
PnĀ·nred
in
Japan
HI!\SHJ.ll8009
Approx.
0.0770
at 20'C
1-phase resistance
9-27
2} Stator coil insulation test
Check the continuity between
the
terminais
and
the
stator core.
II
there is continuity, insulation of the sta-
tor coil is defective. This
wm
cause a short-circuit with
the earth core. Replace the stator coil.
(4) Brush
The
brush
is hard
and
wears
slowly,
but
when it is
worn
beyond
the allowable limit, replace
ft.
When
replacing the brush,
also
check
the
strength
of
the
brush spring.
To check, push the spring down to 2mm
(0.0787in.}
from the end surface of the brush holder, and read the
gauge.
Brush
spring
stre
rath
255-3459
{5) Brush
wear
Check the brush length.
The brush
wears
very little,
but
replace the brush lf
worn over the wear limit line printed on the brush.
/
Wear
limit
line
(brush)
mm
Maintenance standard Wear limit
Brush length
16 9
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