Description & Operation
Starter motor features a small permanent magnets mounted inside the field frame and a planetary gear reduction mechanism between armature and drive. Drive housing encloses the shift lever, shift lever mechanism, and solenoid plunger to protect them from exposer to ice, dirt, and other elements.
When voltage is applied to solenoid, voltage is applied to solenoid windings which causes movement of solenoid plunger and shift lever, causing drive pinion to engage the flywheel and close solenoid switch contacts. See Fig 1. When solenoid switch contacts close, starter motor energizes and cranks the engine. As the engine starts, the pinion overrun clutch protects the armature from excessive speed until the ignition switch is opened and the plunger return spring disengages the pinion.
Starters with the PG designation have a pinion that is driven by a gear reduction system. These starters should not be dissembled for any reason. They are serviceable only by complete replacement. Ensure replacement starters are the same size as original starters. See Figure, Figure and Figure .