EA$2<1
1\l1
CHECKING THE STARTER MOTOR
1. Check:
• Commutator
Dirt
-t
Clean with
600
grit sandpaper.
2. Measure:
• Mica undercut "a"
Out
of
specification
-t
Scrape the mica to t
he
proper measurement with a hacksaw blade
that has been grounded to fit the commutator.
Mica
undercut
(dep
th
)
0.70
mm
(0.03 in)
TIP
~~~~~~~~~~~~~~~
The mica of the commutator must be undercut to
ensure proper operation
of
the commutator.
I
•
• •
•
3. Measure:
• Armature assembly resistances (commutator
and insulation)
Out
of
specification
-t
Replace the starter
motor.
TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT
a. Measure the armature assembly resistances
with the digital circuit tester.
Digi
tal
circuit
tester
90890-03174
Mod
el
88
Mult
imeter
with
tacho
m-
eter
YU-A1927
Armature
coil
resi
stance
0.
0050
- <
>.0
150
n
In
su
lation
resistance
Above
1 Mn
at
20 °C (68 °F)
b. If any resistance is
ou
t
of
specification, re-
place the starter motor.
ELECTRIC STARTER
2
'
,
•.
:
~
1
1. Commutator resistance
2. Insul
at
ion resistance
Iii!'!
~
.o
••••••••••••••••••••••••••••••••
4. Measure:
• Brush length "a"
Out
of
specification
-t
Replace t
he
brush
ho
lder set.
Brush
overall
length
12.0
mm
(0.47 in)
Limi
t
6.50
mm
(0.26
in
)
5. Measure:
• Brush spring force
a
Out
of
specification
-t
Replace the brush
ho
lder set.
5-37
Brush
spring
force
6.03-6.52
N (615-665 gf,
21.71
-23
.47
oz)
6.
Check:
• Gear teeth
Damage/wear
-t
Replace the starter mo
to
r.
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