Chapter 3. Troubleshooting - Woodward EG-3P Installation And Operation Manual

Manual 82560
This chapter gives instructions for checking actuator and prime mover operation.
See appropriate manual for troubleshooting your 2301 governor system.
1. Check the load to be sure that speed changes are not the result of unusual
load variations.
2. On a diesel or gas engine, check engine operation to be sure all cylinders are
firing properly and that injectors or spark plugs are in good operating condition.
3. Check operating linkage between actuator and prime mover for misalignment,
for binding, or for excessive backlash or "play" in linkage motion.
4. Check the voltage regulator for proper action.
5. Make sure the hydraulic pressure supply to the actuator is adequate, clean,
and free of foaming. See that lines are not clogged; that the filter is seated
properly in its housing.
A 6 Vdc battery connected between posts A and B on the actuator with posts C
and D jumpered should cause the terminal shaft to go to almost maximum fuel. A
1.5 V battery across posts A and B, with posts C and D jumpered, should cause
the terminal shaft to barely leave the minimum-fuel position. If this does not
occur, further testing is required.
6. Disconnect leads from actuator terminals. Hook up circuit to actuator, as
shown in Figure 2-2, with hydraulic pressure applied as usual to the actuator
input. Terminal (output) shaft should move through its range as the
potentiometer is rotated and should take the same position each time for a
given potentiometer setting. If the output shaft positions or operates
erratically, the problem may be in the hydraulic supply.
Woodward
Chapter 3.
Troubleshooting
Actuator oil pressure may be checked with a pressure gauge installed in
the base. Another method to check actuator oil pressure is to check the
torque on the output shaft with a torque wrench. If torque is
approximately at the rated figure, it can be assumed that the oil supply
pressure is correct or the oil pump is operating correctly.
The following tests remove the engine or turbine from governor
control. Do NOT attempt the tests unless you have another means to
control the speed of the engine or turbine. Otherwise overspeed and
prime mover runaway are possible, which can cause property
damage or personal injury.
Any time the cover is removed, recheck the terminal shaft travel after
replacing the cover. The feedback linkage is attached to the subcap, and
tightening the cover and subcap changes the pivot point of the
feedback unless the same amount of pressure Is applied to the screws.
Be prepared to make an emergency shutdown when starting the
engine, turbine, or other type of prime mover, to protect against
runaway or overspeed with possible personal injury, loss of life, or
property damage.
EG-3P Actuator
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