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(a)
Checking of brushes
Check the brushes and the insu-
lated
condi tion
of
brush
holders
on
the
pressure
(+)
side
of
the
brush
spr ing.
(b)
Checking of armature
1)
Check
for
short
cir-
cuit
using
a
growler
tester.
2)
Check grounding. There
should
be
no
continuity
between the commutator and
the armature shaft.
3)
Check commutator.
Check
undercut
depth
and
roughness.
(3)
Checking of Field Coil
Check for grounding.
These should be no continuity between one end
(brush) of the coil and yoke.
(In this case, the shunt coil grounding
wire will be disconnected.)
Check for disconnection.
coil (between brushes).
There must be continuity at both ends of
Check
condi tion of
installation.
If
the pole piece and coil are
loosened or damaged, replace them as yoke assembly.
(The pole piece
is caulked to the yoke.
Check the solenoid.
If the pinion fails to move out into mesh with
the ring gear, check the solenoid in the following manner.
(a)
Continuity test
Continuity must exist between the terminals (5) and (M) and be-
tween
the terminal (5) and body.
If the resistance is zero, it
means
the
solenoid
is
defective
and
must
be
replaced.
97
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