Kubota EA330-E4 Series Workshop Manual page 62

EA330-E4, WSM
4) Magnet Switch
The magnet switch serves as a relay to drive the
armature. It consists of a pull-in coil, a holding coil and a
plunger. It works as follows.
1. When the starter switch is set to START position, the
armature is rotated at a small amperage as the
pull-in coil (9) and the holding coil (7) attract the
plunger (6) to the left.
2. When the main circuit from the contact plate (11) to
armature is closed by the plunger (6), the armature
starts rotating at a strong torque.
At the same time, a current stops flowing into the
pull-in coil and the plunger is kept attracted by the
holding coil alone.
3. When the starter switch is released after starting the
engine, the flow of a current to the holding coil also
stops. Thus, the armature stops rotating.
(1) Joint
(2) Switch Housing
(3) Return Spring
(4) Magnetic Cover
(5) Switch Cover
(6) Plunger
(7) Holding Coil
(8) Plunger Shaft
(9) Pull-in Coil
(10) Spring
(11) Contact Plate
1-M29
ENGINE
[A] Magnet Switch
Construction
[B] Pull-in and Holding Coil
9Y1211018ENM0048US0
KiSC issued 05, 2015 A