Electrical System; Starting System - Kubota WG972-E2 Workshop Manual

WG972-E2, DF972-E2, WSM

7. ELECTRICAL SYSTEM

[1] STARTING SYSTEM

■ Staeter
The starter is the electromagnetic drive type.
Type of motor
Nominal output
Nominal output
Nominal output
Direction of rotation
(1) Solenoid Switch
(2) Plunger
(3) Spring
(4) Shift Lever
(5) Brush
■ Operation of Starter
[ When key switch is turned to "START" position]
The contacts of key switch (1) close and the holding
coil (3) is connected to the battery to pull the plunger (5).
The pull-in coil (4) and the starting motor are also
connected to the battery.
The pinion (8) is pushed against the ring gear (9) with
the overrunning clutch (7) by the shift lever (6) and the
magnetic switch is closed.
[ When the solenoid switch is closed]
The current from the battery flows through the
solenoid switch (2) to the starting motor.
The pinion (8), which is pushed against the ring gear
(9) and rotated along the spline, meshes with the ring
gear to crank the engine.
The engine starts and increases its speed.
While the pinion spins faster than the armature, the
overrunning clutch (7) allows the pinion to spin
independently from the armature.
The pull-in coil (4) is short-circuited through the
solenoid switch (2) and the key switch (1).
[ When the key switch is released]
The current from the battery flows to the holding coil
(3) through the pull-in coil (4) to diminish the magnetism
between them.
The plunger (5) is pushed by the spring to pull in the
pinion.
(1) Key Switch
(2) Solenoid Switch
(3) Holding Coil
(4) Pull-in Coil
(5) Plunger
M-23
GASOLINE / LPG ENGINE
DC, Series-wound, Electromagnetic
drive
12V
1.0 kW
30 seconds (Do not rotate continuously
for longer periods.)
Clockwise as viewed fromo pinion side
(6) Commutator
(7) Armature
(8) Field Coil
(9) Overrunning Clutch
W1017019
(6) Shift Lever
(7) Overrunning Clutch
(8) Pinion
(9) Ring Gear
W1017282
KiSC issued 01, 2006 A