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7-7
ELECTRICAL SYSTEM
STARTER MOT OR INSPECTION
CARBON BRUSHES
When the brushes are worn, the motor
will be
unable to produce sufficient torque, and the engine
will be difficult to turn over. To prevent this,
Ly*
4
, ,
periodically, inspect the length of the brushes,
-%.$.-'
replacing them when they are toe short or chipping.
I
Service Limit
6 mm
(0,2
in)
I
COMMUTATOR
If the commutator surface is dirty, starting per-
formance decreases. Polish the commutator with
#400
or similar fine emery paper when
it
is dirty.
After polishing
it,
wipe the commutator with
a
clean dry cloth.
Measure the commutator under
cut
.
ARMATURE
cot
L
Using a pocket tester, check the coil for open and
ground by placing probe pins
on each commutator
segment and rotor core (to test for ground) and on
any two segments a t
various places
(to test
for
open), with
the
brushes lifted off the commutator
surface.
If the coil
is found to be open-circuited or ground-
ed replace the
armature.
Continuous use of a
defective armature
will
cause
the
starter motor to
suddenly fail.
Service Limit
1
I
09900-25002
i
Pocket
tester
-
0.2 mrn
10.OQ8 in)
SEGMENT
MICA
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