Yanmar 3JH3E - 3-3 Removal

Chapter 9 Electrical System
3. Starter Motor
______________________________ 3,4]H3(BXC)E
3-2.2 The Engagement Mechanism
This type utilizes electromagnetic force. The pinion is
engaged with the ring gear by means of the torsion spring
and shift lever.
The plunger is shifted by the attracting
force, and depresses the pinion. When the pinion does not
strike the ring gear, smooth engagement occurs,
and
then the contacts close to start the motor.
Also, when the pinion strikes the ring gear teeth, it com-
presses the torsion spring and closes the contacts. When
the current flows through the motor and the armature
Pinion
starts rotating, the pinion is depressed strongly on the ring
gear and rotated by means
of the torsion spring pressure
and the helical spline's force. Then, the pinion teeth are
arranged
in engagement with the ring gear teeth. When
the key start switch
is turned OFF, the magnetic switch is
demagnetized, and the pinion is returned by the torsion
spring force. Simultaneously, the contacts open
to stop
motor operation.
In Fig. 2, engagement between the pin•
ion and ring gear is illustrated.
CD
@ (3)
Fig.
2. Engagement of Pinion ;nd Ring Gear
Ring Gear
2
1. Pinion
2. Armature
3. Magnet
4, Torsion Spring
5. Shift !ever
6. Stationary Contactor
7. Movable Contactor
11
S. Shunt Coit (Holding Goi!)
9. Series Coil (Attracting Coil)
10. Plunger
11. Key Start Switch
12 Battery
13. Riug Gear
Fig. 3. Schematic Layout of Planetary Gear Starter's Electricaf Circuit
3~3 Removal
(1) Disconnect the battery's negative or 8 side cable at
the battery.
(2) Disconnect the battery's posilive
or © cable and the
main harness' feed wire from the
magnetic switch of
the starter.
Printed in japan
HINSHI-H8009
(3) Disconnect 0 cable at the starter.
(4) Remove the starter retaining bolts and lockwashers.
Then, withdraw the
starter.
9-9