Yanmar 3JH3E - Page 220

Chapter 9 Electrical
System
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3,4JH3(B)(C)E
3}
Rotor coil insulation test
Check the continuity between the slip ring and the
rotor core,
or
the shaft.
11
there
is
continuity, insulation
inside the rotor
is
defective, causing a short with the
earth circuit. Replace the rotor coil.
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--
.
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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.
~
\
. '
~:,
~~-
\
·~
t
'
'c;
Resistance value
Printed in Japan
HINSHI-H8009
~
I .
I
Approx.
0.04
0
at
2o·c
u,v-phase resistance
Approx.
0.036
o
at
2o·c
w-phase resistance
9-35
2}
Stator coil insulation test
Check the continuity between the terminals and the
stator core.
If
there
is
continuity, insulation of the sta-
tor coil
is
defective. This will 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
it. 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
9auge.
Brush
spring
strerath
255-345g
(5}
Brush wear
Check the brush length.
The brush wears very little, but replace the brush if
worn over the wear limit line printed
on
the brush.
Wear
limit
line
(brush)
mm
Maintenance standard
Wear limit
Brush length
16 9