CHECKING THE STARTER MOTOR
1. Check:
• Commutator
If dirty -> Clean with 600 grit sandpaper.
2. Measure:
• Mica undercut "a"
If out of specification -> Scrape the mica to the proper measurement with a hacksaw blade that has been
grounded to fit the commutator.
1. Check:
• Commutator
If dirty -> Clean with 600 grit sandpaper.
2. Measure:
• Mica undercut "a"
If out of specification -> Scrape the mica to the proper measurement with a hacksaw blade that has been
grounded to fit the commutator.
The mica of the commutator must be undercut to ensure proper operation of the commutator.
3. Measure:
• Armature assembly resistances (commutator and insulation)
If out of specification -> Replace the starter motor.
a. Measure the armature assembly resistances with the pocket tester.
• Armature assembly resistances (commutator and insulation)
If out of specification -> Replace the starter motor.
a. Measure the armature assembly resistances with the pocket tester.
b. If any resistance is out of specification, replace the starter motor.
4. Measure:
• Brush length "a"
If out of specification -> Replace the brush set assembly.
• Brush length "a"
If out of specification -> Replace the brush set assembly.
5. Measure:
Brush spring force
If out of specification -> Replace the brush set assembly.
Brush spring force
If out of specification -> Replace the brush set assembly.
6. Check:
• Gear teeth
If Damaged/Worn -> Replace the starter motor.
7. Check:
• Bearing
If Damaged/Worn -> Replace the starter motor.
• Gear teeth
If Damaged/Worn -> Replace the starter motor.
7. Check:
• Bearing
If Damaged/Worn -> Replace the starter motor.
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