Fuel Actuator - Toro Reelmaster 5010- H Service Manual

Fuel Actuator

The fuel actuator used on your Reelmaster must be en-
ergized by the TEC controller for the diesel engine to
run. The actuator is mounted to the injection pump on
the engine (Fig. 76).
The fuel actuator and TEC controller work together to
maintain engine speed by adjusting the fuel delivery to
the engine. A sensor in the motor/generator provides
the generator/engine speed to the TEC controller via the
CAN- bus. If there is a change in engine speed (e.g. load
conditions change, engine speed switch pressed by op-
erator), the TEC controller modifies the electrical output
to the actuator which adjusts fuel as required to maintain
engine speed.
The TEC controller monitors the operation of the fuel ac-
tuator. If the TEC controller detected a fuel actuator
problem during engine operation, the InfoCenter Dis-
play can be used to identify the fault (see Fault Codes
in the Troubleshooting section in this chapter).
NOTE: If a problem with the fuel actuator or circuit
wiring exists, the extension spring attached to the actua-
tor bracket and engine speed control lever will cause the
engine to run at high idle (3150 RPM) with the engine
mechanical governor maintaining engine speed. In this
situation, the control arm mounted engine speed switch
will not change engine speed and a fault code should be
displayed on the InfoCenter Display.
Testing
1. Park the machine on a level surface, engage the
parking brake, lower the cutting units and stop the en-
gine. Remove the key from the ignition switch. Open
hood to gain access to engine.
2. Locate fuel actuator and disconnect wire harness
connector from fuel actuator.
NOTE: The fuel actuator may be tested in place or
removed from the engine for testing.
3. If the actuator is removed from the engine, make
sure that the actuator plunger moves freely and is free
of dirt, debris and corrosion.
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.
Reelmaster 5010- H
4. Using a multimeter (ohms setting), measure resis-
tance between the two terminals in the fuel actuator con-
nector. Resistance should be from 5.0 to 5.5 ohms.
5. If actuator coil resistance is incorrect, replace fuel
actuator.
6. When testing is complete, connect wire harness con-
nector to the fuel actuator.
7. Lower and secure hood.
2
1. Injection pump
2. Fuel actuator
1
1. Fuel actuator
Page 5 - 73
3
1
Figure 76
3. Extension spring
2
Figure 77
2. Actuator connector
Electrical System