Service manual

G420F(FE) Service Manual Chapter 4. Engine Electrical System 139
STARTING SYSTEM
General Description
The starting motor is used to turn the engine
flywheel lfast enough to make the engine run. The
starting motor has a solenoid. When the ignition
switch is activated, voltage from the electrical
system will cause the solenoid to move the pinion
toward the flywheel ring gear of the engine. The
electrical contacts in the solenoid close the circuit
between the battery and the starting motor just
before the pinion engages the ring gear. This
causes the starting motor to rotate. This type of
motor "turn on" is a positive shift starting motor.
When the engine begins to run, the overrunning
clutch portion of the pinion drive prevents damage to
the armature caused by excessive speeds. The
clutch does this by breaking the mechanical
connection. The pinion will stay meshed with the
ring gear until the ignition switch is released. A
return spring in the overrunning clutch returns the
clutch to its rest position.
Components