Governor System
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Sensitivity Adjustment
Governor sensitivity is adjusted by repositioning
governor spring in holes of governor lever. If speed
surging occurs with a change in engine load, governor
is set too sensitive. If a big drop in speed occurs when
normal load is applied, governor should be set for
greater sensitivity and adjust as follows:
1. To increase sensitivity, move spring closer to
governor cross shaft.
2. To decrease sensitivity, move spring away from
governor cross shaft.
ELECTRONIC GOVERNOR
Electronic governor regulates engine speed at varying
loads. Typical electronic governor includes:
● Digital linear actuator.
● Throttle linkage.
● Linkage spring.
● Choke linkage.
● Throttle lever adapter.
● Governor Control Unit.
Digital Linear Actuator (DLA)
Energizing bi-directional digital linear actuator coils in
proper sequence, causes threaded shaft to move out
of, or back into rotor, in precise linear increments. When
power is removed, actuator shaft remains in position.
DLA must initialize (fully extend) to move throttle plate to
closed position, and partially open for starting. Correct
adjustment of DLA is critical to achieve full range of
throttle plate movement. See Adjustment.
Governor control unit (GCU) senses engine speed
by pulse voltage inputs from ignition modules. GCU
regulates engine speed by variable input voltage from a
customer-supplied potentiometer or a single pole, single
throw (SPST) switch.
NOTE: Actual speeds depend on application. Refer to
equipment manufacturer’s recommendations.
Potentiometer Specifi cations
Wiper Voltage Engine Speed (RPM)
0-1 Low Speed Endpoint
1-9 Variable Speed Endpoint
9-16 High Speed Endpoint
SPST Switch Specifi cations
Switch Position Engine Speed (RPM)
Open Low Speed Endpoint
Closed High Speed Endpoint
GCU Safety Features
In event of an engine overspeed condition, GCU will shut
down engine by grounding ignition modules.
GCU will shut down engine by grounding ignition when
power to GCU is lost.
Linkage
Throttle linkage spring will fully open throttle plate if
linkage becomes detached from DLA. This will create an
overspeed condition causing engine to shut down. DLA
shaft will have to be manually screwed back into body,
and then retracted before reassembling linkage.
Adjustment
DLA must be in fully retracted position during assembly.
Full range of throttle plate movement will not be
achieved if DLA is partially extended when assembled.
Loosen DLA mounting plate screws located on top of
actuator plate. With throttle linkage centered in U-Clip or
secured with a retaining clip at end of DLA shaft, slide
DLA bracket assembly back until throttle plate is fully
open. Torque mounting plate screws to 2.5 N·m (22 in.
lb.).
Troubleshooting
Engine Starts But Will Not Continue to Run
1. Check linkage connection between DLA and throttle
plate.
2. Verify DLA initializes when power is supplied (key
switch in start or run position).
3. Test potentiometer wiper output voltage (if
equipped).
4. Test SPST switch (if equipped).
5. Check wire harness and connections.
Engine Does Not Run At Expected Speed
1. Check to see that throttle linkage and DLA have full
range of motion having no mechanical interference.
2. Test potentiometer wiper voltage (if equipped).
3. Test SPST switch (if equipped).
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