Fuel Shut Down Solenoid; Purpose; Location; How It Works - Toro 22317 Service Manual

4-PAW DIESEL/ELECTRICAL

Fuel Shut Down Solenoid

Purpose

When the ignition switch is in the START position, the
fuel shut down solenoid pulls the speed control plate on
the injection pump to allow fuel to the engine. When the
ignition switch is in the OFF position, the fuel shut down
solenoid moves the speed control plate on the injection
pump to stop fuel flow to the engine.

Location

The fuel shut down solenoid is located on the left side of
the engine (Fig. 2061).
6/5-12
Fig. 2061

How It Works

The fuel shut down solenoid has a coil wrapped around
and iron core. Whenever 12 volts is applied to the coil,
it becomes a magnet. The magnet pulls the linkage rod
in. This moves the speed control plate on the injection
pump (Fig. 2062).
The fuel shut off solenoid must be continuously
energized to keep the engine running.
The fuel shut off solenoid has two circuits. The first is
the Pull Coil, energized when the ignition switch is in
the START position. Since the power to this coil is lost
when the ignition switch is released to RUN, there is a
second circuit called the Hold Coil. The Hold Coil will be
IMG-0167
energized as long as the ignition switch is in the RUN
position.
Fig. 2062
Toro Wheeled CUL Service Manual
IMG-0560a