Engine Stop Solenoid; Circuit And Its Function - Kubota U20-3 Workshop Manual

U20-3, U25-3 WSM

(2)Engine stop solenoid

1) Structure
Suicide switch
plunger
holding coil
Pull-in coil

2) Circuit and its function

The engine stop solenoid circuit is as shown at
left.
Turn the key switch to the ON position, and the
battery current flows both to the pull-in coil and
the holding coil. These coils are excited to attract
and lift the plunger.
Now the fuel injection pump is ready to get the
engine started.
Being attracted upward, the plunger pushes and
opens the contact, which discontinues the cur-
rent flow to the pull-in coil.
With the current still flowing to the holding coil,
the plunger stays in this position.
Turn the key switch to the OFF position, and the
current flow to the holding coil is also interrupted.
By the force of the return spring, the plunger
comes back to the original position. By so doing,
the fuel injection pump will be back to the
engine-off status.
Specifications
1. Rated voltage
2. Rated ampere
filter
Pull-in coil
Hold coil
3. Resistance
Pull-in coil
spring
Hold coil
plunger
oil seal
V-M-8
Electrical system (Mechanism section)
: DC12V
: 32A / DC12V
: 77A / DC12V
at 20°C
: Ω
:
Ω
Temp.