4-8 ELECTRICAL
STARTER ENGAGEMENT MECHANISM
A solenoid (electromagnetic force) type starter switch, utilizing a torsion spring and shift lever, engages the
pinion gear to the flywheel.
When the ignition key is turned to “START”, current flows through the switch winding creating an electromag-
net pulling the plunger in.
The shift lever, attached to the plunger, then pushes the pinion up into engagement with the flywheel. Plunger
and shift lever movement also compresses the torsion spring, which applies pressure against the shift lever
and pinion gear to maintain positive engagement.
Final plunger movement closes the starter switch contacts, which allows current to flow through the starter
motor windings, rotating the starter motor armature, pinion gear and flywheel.
When the ignition key is released from start, current flow to the switch is shut off and electromagnetic force
ceases. The torsion spring then pulls the plunger out, disengaging the pinion gear from the flywheel through
the shift lever.
Movement of the plunger also opens the switch contacts, stopping current flow to the starter motor windings,
shutting off the starter motor.
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11
8
9
10
6
2
4
5
1
13
3
7
1. Pinion
2. Armature
3. Magnet
4. Torsion spring
5. Shift lever
6. Stationary cantact
7. Movable contact
8. Hold-in coil
9. Pull-in coil
10. Plunger
11. Ignition switch
12. Battery
13. Ring gear
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