TP-6881 7/15 87Section 5 Component Testing and Adjustment
5.10.3 Hunting/Surging
Hunting/surging problems thought to be caused by the
governor system are more likely to be caused by fuel
supply, engine, or carburetor problems. Check engine
speed stability using the following procedure before
testing the governor.
Hot engine and exhaust system.
Can cause severe injury or death.
Do not work on the generator set until
it cools.
WARNING
Servicing the exhaust system. Hot parts can cause
severe injury or death. Do not touch hot engine parts. The
engine and exhaust system components become extremely
hot during operation.
Hazardous voltage.
Can cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
areinplace.
Moving parts.
WARNING
Servicing the generator set when it is operating. Exposed
moving parts can cause severe injury or death. Keep
hands, feet, hair, clothing, and test leads away from the belts
and pulleys when the generator set is running. Replace
guards, screens, and covers before operating the generator
set.
1. Open the generator set line circuit breaker.
2. Start the generator set.
3. Hold the throttle linkage steady while the engine is
running. See Figure 5-15. If the engine runs at a
steady speed with no hunting or surging when the
throttle is held steady, then the hunting/surging
problems during operation are probably caused by
the governor. Proceed to Section 5.10.4.
4. Check the linkage between the stepper motor and
the carburetor. Replace any worn or damaged
components.
5. Verify that the speed control parameters have not
been modified. Reset the parameters to the
default settings if they have been modified. See
Figure 5-18, Controller Settings.
6. If the engine speed hunts or surges while the
throttle is held s teady, check the carburetor and
engine operation. Refer to the engine service
manual for engine diagnostic and service
information.
1. Carburetor
2. Electronic governor stepper motor
3. Carburetor throttle linkage
1
2
3
2
3
1
8RESV(L)
10/12RESV(L)
Figure 5-15 Stepper Motor and Carburetor
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