18 DF40/50 "K5" ('05) MODEL
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 electro-
magnet 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.
'
en
Pinion
(2)
Armature
@Magnet
@Torsion
spring
@ Shift lever
@
Stationary
cantact
CD
Movable contact
® Hold·in coil
® Pull·in coil
®l
Plunger
® Ignition switch
© Battery
@Ringgear
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