Fuel Stop Solenoid (Groundsmaster 3280−D) - Toro Groundsmaster 3280-D Service Manual

Fuel Stop Solenoid (Groundsmaster 3280−D)
The fuel stop solenoid used on the Groundsmaster
3280−D (diesel engine) must be energized for the diesel
engine to run. The solenoid is mounted to the injection
pump on the engine (Fig. 30).
In Place Testing
NOTE: Prior to taking small resistance readings with a
digital multimeter, short the test leads together. The me-
ter will display a small resistance value (usually 0.5
ohms or less). This resistance is due to the internal re-
sistance of the meter and test leads. Subtract this value
from the measured value of the component you are test-
ing.
1. Disconnect wire harness connector from solenoid.
2. Using a digital multimeter, touch one test lead to the
pull coil terminal and the other test lead to the fuel stop
solenoid frame (ground) (Fig. 31). The resistance of the
pull coil should be less than 1 ohm (but not zero).
3. Using a digital multimeter, touch one test lead to the
hold coil terminal and the other test lead to the fuel stop
solenoid frame (ground) (Fig. 31). The resistance of the
hold coil should be approximately 15 ohms.
4. Connect solenoid to the wiring harness.
Live testing
1. Disconnect wire harness connector from solenoid.
NOTE: The solenoid may be removed from the engine
or tested in place.
2. If the solenoid is removed from the engine, make
sure that the solenoid plunger moves freely and is free
of dirt, debris and corrosion.
NOTE: When testing run solenoid, use test leads with
at least 14 gauge wire.
3. Connect a positive (+) test lead from a 12 VDC
source to the pull coil and hold coil terminals.
4. Touch a negative (−) test lead from the 12 VDC
source to the fuel stop solenoid frame (ground) (Fig. 31).
The solenoid should engage, making an audible "click,"
and the plunger should retract.
5. Remove positive (+) voltage from the pull coil termi-
nal. The solenoid should stay engaged.
6. Remove positive (+) voltage from the hold coil termi-
nal. The solenoid should release.
7. Reconnect the wires to the solenoid.
Electrical System
2
1. Injection pump
1
1. Fuel stop solenoid
2. Pull coil terminal
Page 6 − 22
1
Figure 30
2. Fuel stop solenoid
Figure 31
3. Hold coil terminal
Groundsmaster 3280−D/3320
2
3