Checking The Starter Motor
Fragment manuala — str. 343
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ELECTRIC STARTER
EAS24790
CHECKING THE STARTER MOTOR Pocket tester
1. Check: 90890-03112
• Commutator Analog pocket tester
Dirt → Clean with 600 grit sandpaper. YU-03112-C
2. Measure:
• Commutator diameter “1”
Out of specification → Replace the starter Armature coil
Commutator resistance “1”
motor.
0.024–0.030 Ω at 20 °C (68 °F)
Limit Insulation resistance “2”
23.5 mm (0.93 in) Above 1 MΩ at 20 °C (68 °F)
b. If any resistance is out of specification, re-
place the starter motor.
3. Measure:
• Mica undercut “a”
Out of specification → Scrape the mica to the ▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
proper measurement with a hacksaw blade 5. Measure:
that has been grounded to fit the commutator. • Brush length “a”
Out of specification → Replace the brushes
Mica undercut (depth) as a set.
1.50 mm (0.06 in)
Limit
NOTE: 3.65 mm (0.14 in)
The mica of the commutator must be undercut to
ensure proper operation of the commutator.
6. Measure:
• Brush spring force
4. Measure: Out of specification → Replace the brush
• Armature assembly resistances (commutator springs as a set.
and insulation)
Out of specification → Replace the starter Brush spring force
motor. 5.28–7.92 N (19.01–28.51 oz)
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(538–808 gf)
a. Measure the armature assembly resistances
with the pocket tester.
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