13.8
ELECTRICAL
STARTER MOTOR STATIC TESTING
1. Remove starter motor and disassemble. (See page 9.14 for
exploded view) Mark end covers and housing for proper
reassembly.
2. Remove pinion retaining snap ring, spring and pinion
gear.
3. Remove brush end bushing dust cover.
4. Remove housing through bolts.
5. Slide brush end frame off end of starter.
NOTE: The electrical input post must stay with the
field coil housing.
6. Slide positive brush springs to the side, pull brushes out of
their guides and remove brush plate.
7. Clean and inspect starter components.
NOTE: Some cleaning solvents may damage the
insulation in the starter. Care should be exercised
when selecting an appropriate solvent. The brushes
must slide freely in their holders. If the commutator
needs cleaning, use only an electrical contact
cleaner and/or a non-metallic grit sandpaper.
Replace brush assembly when worn to 5/16, (.8 cm)
or less.
STARTER HOUSING AND FIELD COIL
INSPECTION
1. Using a digital multitester, measure resistance between
starter input terminal and insulated brushes. The reading
should be.3 ohms or less.
2. Measure resistance between insulated brushes and field
coil housing. The reading should be infinite.
3. Inspect insulated brush wire and field coil insulation for
damage. Repair or replace components as required.
ARMATURE TESTING
1. Using a digital multitester, measure resistance between
each of the segments of the commutator. The reading
should indicate.3 ohms or less.
2. Measure resistance between commutator and armature
shaft. Reading should be infinity.
3. Place armature in a growler. With the growler on, position
a hacksaw blade lengthwise 1/8, (.03 cm) above armature
coil laminates. Rotate armature 360_. If hacksaw blade is
drawn to the armature on any pole, the armature is shorted
and must be replaced.
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