TP-6805 8/15104 Section 6 Component Testing and Adjustment
D Check the idle-adjustment screw. The screw should
not prevent the throttle plate from closing completely.
D Check the throttle linkage for any binding, dirt,
damage, or other visible problems.
D Check the fuel supply pressure and the fuel supply
system for leaks, blockages, and/or failed system
components (regulators, valves, e tc.). See
Section 6.11, Fuel Systems.
Hazardous voltage.
Can cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
areinplace.
Moving parts.
WARNING
D Observe the stepper motor operation. The stepper
motor should open the throttle while cranking, and
pull back after speed feedback is detected.
D Check for electronic governor faults. The fuel shutoff
solenoid deenergizes and the generator set shuts
down under the following conditions:
D Closed throttle
D Engine overspeed
D Broken fuel shutoff solenoid lead
D Broken stepper motor leads (erratic performance)
D Failed actuator linkage (erratic performance)
6.8.3 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.
Also see Section 5.10, Troubleshooting Engine Hunting,
20 kW Models.
Hazardous voltage.
Can cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
areinplace.
Moving parts.
WARNING
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.
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 6-15. 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 6.8.4.
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 6-18, Controller Settings.
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