Woodward EG-3P User manual

Installation and Operation Manual
EG-3P Actuator
including EG-1P, EG-3P with compensation,
EG-3P oil motor, and EG-3P oil pump
Manual 82560 (Revision L)

WARNING—DANGER OF DEATH OR PERSONAL INJURY
WARNING—FOLLOW INSTRUCTIONS
Read this entire manual and all other publications pertaining to the work to be performed
before installing, operating, or servicing this equipment. Practice all plant and safety
instructions and precautions. Failure to follow instructions can cause personal injury and/or
property damage.
WARNING—OUT-OF-DATE PUBLICATION
This publication may have been revised or updated since this copy was produced. To verify
that you have the latest revision, be sure to check the Woodward website:
www.woodward.com/pubs/current.pdf
The revision level is shown at the bottom of the front cover after the publication number. The
latest version of most publications is available at:
www.woodward.com/publications
If your publication is not there, please contact your customer service representative to get
the latest copy.
WARNING—OVERSPEED PROTECTION
The engine, turbine, or other type of prime mover should be equipped with an overspeed
shutdown device to protect against runaway or damage to the prime mover with possible
personal injury, loss of life, or property damage.
The overspeed shutdown device must be totally independent of the prime mover control
system. An overtemperature or overpressure shutdown device may also be needed for
safety, as appropriate.
WARNING—PROPER USE
Any unauthorized modifications to or use of this equipment outside its specified
mechanical, electrical, or other operating limits may cause personal injury and/or property
damage, including damage to the equipment. Any such unauthorized modifications: (i)
constitute "misuse" and/or "negligence" within the meaning of the product warranty
thereby excluding warranty coverage for any resulting damage, and (ii) invalidate product
certifications or listings.
CAUTION—POSSIBLE DAMAGE TO EQUIPMENT OR PROPERTY
CAUTION—BATTERY CHARGING
To prevent damage to a control system that uses an alternator or battery-charging device, make
sure the charging device is turned off before disconnecting the battery from the system.
CAUTION—ELECTROSTATIC DISCHARGE
Electronic controls contain static-sensitive parts. Observe the following precautions to
prevent damage to these parts.
• Discharge body static before handling the control (with power to the control turned off,
contact a grounded surface and maintain contact while handling the control).
• Avoid all plastic, vinyl, and Styrofoam (except antistatic versions) around printed circuit
boards.
• Do not touch the components or conductors on a printed circuit board with your hands
or with conductive devices.
IMPORTANT DEFINITIONS
• A WARNING indicates a potentially hazardous situation which, if not avoided, could result in
death or serious injury.
• A CAUTION indicates a potentially hazardous situation which, if not avoided, could result in
damage to equipment or property.
• A NOTE provides other helpful information that does not fall under the warning or caution
categories.
Revisions—Text changes are indicated by a black line alongside the text.
Woodward Governor Company reserves the right to update any portion of this publication at any time. Information
provided by Woodward Governor Company is believed to be correct and reliable. However, no responsibility is
assumed by Woodward Governor Company unless otherwise expressly undertaken.
© Woodward 1983
All Rights Reserved

Manual 82560 EG-3P Actuator
Woodward i
Contents
CHAPTER 1. GENERAL INFORMATION...........................................................1
2301 Electric Governor...........................................................................................1
Proportional Actuators for 2301 Electric Controls..................................................1
EG-3P Actuator ......................................................................................................2
EG-3P Actuator (with Compensation)....................................................................5
CHAPTER 2. INSTALLATION..........................................................................9
Introduction.............................................................................................................9
Factory Adjustments.............................................................................................10
CHAPTER 3. TROUBLESHOOTING...............................................................14
CHAPTER 4. REPLACEMENT PARTS ...........................................................15
CHAPTER 5. SERVICE OPTIONS .................................................................22
Product Service Options.......................................................................................22
Returning Equipment for Repair...........................................................................23
Replacement Parts...............................................................................................24
How to Contact Woodward...................................................................................24
Engineering Services ...........................................................................................25
Technical Assistance............................................................................................26
Illustrations and Tables
Figure 1-1. EG-3P Schematic ................................................................................4
Figure 1-2. EG-3PC Schematic..............................................................................6
Figure 1-3. Needle Valve Location.........................................................................7
Figure 1-4. Parts for Compensation.......................................................................8
Figure 2-1. Recommended Actuator Output Shaft Travel Adjustment ..................9
Figure 2-2. Actuator Test Circuit ..........................................................................11
Figure 4-1a. Exploded View (EG-3P with Gear Pump)........................................16
Figure 4-1b. Exploded View (EG-3P with Oil Motor)............................................17
Figure 4-2. Plug Location for Oil Pump................................................................18
Figure 4-3. Outline Drawing (EG-3P with Gear Pump)........................................19
Figure 4-4. Outline Drawing (EG-3P with Oil Motor)............................................20
Figure 4-5. Outline Drawing (EG-3P with Oil Pump)............................................21
Table 1-1. Typical Governor Oil Pressure vs Useful Work Output ........................3

EG-3P Actuator Manual 82560
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Manual 82560 EG-3P Actuator
Woodward 1
Chapter 1.
General Information
2301 Electric Governor
The 2301 electric governor is one in which its actuator output (terminal) shaft
position is directly proportional to the input signal from its electric control unit. It
can be used in an isochronous (constant speed) mode for single engine
operation or when paralleled with similar units on an isolated bus. It can also be
used in the droop mode for paralleling dissimilar units or operating on an infinite
bus. The 2301 governor is used in the same type of service as many other
governor models. It is particularly well suited, when used with some types of
proportional actuators, to engines operated in tandem to drive a common load. In
such installations, one electric control is used to furnish the same input signal to
the proportional actuator on each engine. Since each actuator receives the same
current, their output shafts take the same position and give each engine the
same amount of fuel.
The 2301 electric governor consists of an electric control unit, a speed setting
potentiometer, and a hydraulic actuator. The electric control receives the input
signals to the governor; its output serves as the input signal to the actuator. The
actuator output controls the flow of energy medium to the prime mover. The
speed setting potentiometer, used to adjust speed setting, provides one of the
inputs to the electric control.
The operation of the 2301 type governor is different and distinct from other
electric governors. The steady-state output of the electric control is a level of
voltage determined by the actuator terminal shaft position required to maintain a
particular load on the prime mover. The voltage is always the same polarity. This
type of control unit requires an actuator in which the output shaft takes a position
proportional to the voltage of the input signal.
In contrast, the electric control unit of the EG series electric governor emits a
nominally zero signal during conditions of on-speed, steady-state operation, and
larger voltage signal only during off-speed or load-changing periods. In this type
of system, the direction of actuator operation depends on signal polarity.
As is the case with any type governor, the prime mover should be equipped with
a separate overspeed device to prevent runaway if a failure should render the
governor inoperative.
Proportional Actuators for 2301 Electric Controls
Among the proportional actuators used with the 2301 electric controls are:
EGB-2P Actuator
This is a proportional actuator that has a mechanical-hydraulic backup governor
section as well as an electric-signal-operated governor section. It must be driven
directly from the prime mover for speed sense to the flyweights and operation of
the governor oil pressure pump. The EGB-2P actuator has a stalled work
capacity of 2.5 ft-lb (3.4 J) at a 32° output shaft travel. Useful work capacity is
about 2/3 of stalled capacity.

EG-3P Actuator Manual 82560
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EG-3P Actuator
This actuator has no mechanical-hydraulic backup governor. Some models
require a drive for an internal oil pump, but the rotation need not be proportional
to prime mover speed. These models can be mounted external to the prime
mover and driven by an electric motor or other device if no drive pad has been
furnished on the prime mover. Other models have an oil motor built into the
actuator. These units require pressure oil from an external source to operate the
oil motor and provide the working pressure needed by the actuator.
The EG-3P has 4.5 ft-lb (6.1 J) of stalled work capacity, a useful work capacity of
3 ft-lb (4 J), and a maximum 42° output shaft travel. Torque rating is 6.0 lb-ft (8.1
Nxm).
2301 Actuator
The simplest of the proportional actuators, the 2301 actuator does not require a
drive of any kind, since there is no flyweight backup governor or pressure pump
contained in it. Hydraulic pressure fluid must be supplied from an external
source, such as the prime mover’s fuel oil or lubricating oil supply. Accepting fluid
pressures within a 15–100 psi (103–690 kPa) range, the 2301 actuator will
supply 0.166 ft-lb (0.225 J) of stalled work capacity for each 10 psi (69 kPa)
hydraulic pressure input (useful work is about 2/3 of stalled capacity), through an
angular output shaft travel of 30°. Torque is 0.32 lb-ft (0.43 Nxm) per each 10 psi
(69 kPa) input.
In applications involving unattended cold starting, an EG-type actuator is
recommended unless fuel oil with its low viscosity is available as the pressure
source for the 2301 actuator. Most lubricating oils are suitable for controlling the
2301 actuator when oil is at operating temperature. Viscosity of hydraulic fluid
above 1000 SSU during cold start will temporarily cause the actuator to operate
erratically.
This manual describes the EG-3P actuator, which may be used with any of the
2301 electric controls. Other manuals describe the other actuators and the
electric controls available to operate proportional actuators.
EG-3P Actuator
Description
The essential element of the EG-3P actuator is an electro-hydraulic transducer
which controls oil flow to and from the power piston through the action of a
polarized solenoid. The position of the terminal shaft on the EG-3P actuator is
proportional to the input current to the solenoid coil controlling the hydraulic pilot
valve plunger.
The EG-3P actuator has a stalled work capacity of 4.5 ft-lb (6.1 J) at 400 psi
(2758 kPa), a useful work capacity of 3 ft-lb (4 J), and a stalled torque rating of
6.0 lb-ft (8.1 Nxm) transmitted through an output shaft rotation of 42°.
Table 1-1 shows a list of typical governor oil pressures versus useful work
output. The output is proportional to the pressure input, and applies to the oil
motor model only. The oil pump model operates at 400 psi (2758 kPa) for 3 ft-lb
(4 J) of useful work output.

Manual 82560 EG-3P Actuator
Woodward 3
Actuator Operating Useful
Oil Pressure Work Output
400 psi (2758 kPa) 3.00 ft-lb (4.07 J)
300 psi (2068 kPa) 2.25 ft-lb (3.05 J)
200 psi (1379 kPa) 1.50 ft-lb (2.03 J)
100 psi (690 kPa) 1.00 ft-lb (1.36 J)
Table 1-1. Typical Governor Oil Pressure vs Useful Work Output
For emergency start-ups, Woodward recommends an oil sump to furnish
immediate oil to the actuator.
The EG-3P actuator normally goes to minimum fuel if the electric signal is
interrupted. Oil for the EG-3P actuator is taken from the engine lubricating
system or from a separate sump (not furnished by Woodward).
An EG-3P actuator can be furnished with or without a drive shaft. The drive shaft
of a unit fitted with such a shaft can be driven by the prime mover or some other
means to provide relative rotation between the pilot valve plunger and bushing
and to rotate the oil pump gears. The drive shaft should rotate between 1200 and
3600 rpm. It can rotate in one direction only. The direction of rotation is
determined by the placement of plugs in the oil passages in the actuator base
and case. A relief valve is incorporated within the actuator to maintain the
operating oil pressure at approximately 350 psi (2413 kPa) above supply
pressure.
An EG-3P actuator not fitted with a drive shaft is equipped with an oil motor.
Actuators with oil motors do not have oil pumps. Oil under pressure must be
supplied to provide working pressure for the actuator and to operate the oil motor
which rotates the pilot valve bushing. Oil supply to the Oil Motor is restricted by
an orifice. The size of the orifice depends upon the pressure supplying the unit
on the following scale:
Supply Pressure Orifice Diameter
80 to 99 psi (552 to 687 kPa): 0.076” (1.93 mm) dia.
100 to 175 psi (688 to 1210 kPa): 0.062” (1.57 mm) dia.
176 to 300 psi (1211 to 2071 kPa): 0.055” (1.40 mm) dia.
301 to 500 psi (2072 to 3448 kPa): 0.047” (1.19 mm) dia.
The orifice size is supplied inside most of the actuators at the time of purchase
and is matched to the specified supply pressure.
Some actuators are designed to have a separate supply line to the oil motor and
in these instances the orifice is placed in the connection to the oil motor rather
than in an internal oil passage.
Work output of the EG-3P actuator equipped with an oil motor depends upon the
pressure of the oil supplied to the actuator. With a 400 psi (2758 kPa) supply
pressure, the actuator output would be 4.5 ft-lb (6.1 J).
Operation
Oil from the external source enters the suction side of the oil pump. The pump
gears carry the oil to the pressure side of the pump, first filling the oil passages
and then increasing the hydraulic pressure. When the pressure becomes great
enough to overcome the relief valve spring force and push the relief valve
plunger down to uncover the bypass hole, the oil recirculates through the pump.

EG-3P Actuator Manual 82560
4 Woodward
The movement of two opposing pistons rotates the actuator terminal shaft. The
prime mover fuel (or steam) linkage is attached to the terminal shaft.
Pressure oil from the pump is supplied directly to the underside of the loading
piston. Pressure in this hydraulic circuit always tends to turn the terminal shaft in
the “decrease fuel” direction.
Since the linkage that connects the loading piston to the terminal shaft is shorter
than the linkage that connects the power piston to the terminal shaft, the loading
piston cannot move up unless the power piston moves down. The power piston
moves down only when the oil trapped beneath it escapes to sump.
The flow of oil to and from the power piston is controlled by the pilot valve
plunger. With the pilot valve plunger centered, no oil flows to or from the power
piston. The pilot valve plunger is centered when its control land exactly covers
the control port in the pilot valve bushing.
The greater of two forces moves the pilot valve plunger up or down. When the
forces are equal, the plunger does not move.
Figure 1-1. EG-3P Schematic

Manual 82560 EG-3P Actuator
Woodward 5
The pilot valve plunger is connected to a permanent magnet that is spring-
suspended in the field of a two-coil solenoid. The output signal from the electric
control box is applied to the solenoid coils and produces a force, proportional to
current in the coils, which tends always to move the magnet—and pilot valve
plunger—down.
A spring force tends always to move the pilot valve plunger and magnet up. The
centering spring sits atop the case in which the solenoid coils are located. It
exerts a constant upward force on the pilot valve plunger. The restoring spring
exerts a downward force on the pilot valve plunger. The downward force from the
restoring spring depends upon the position of the restoring lever. The restoring
lever moves up to decrease the restoring spring force as the terminal shaft
rotates in the “increase” fuel (or steam) direction. The resultant force from the
combined output of the centering spring and restoring spring is a force that is
always urging the pilot valve plunger in the “up” direction; this resultant force
increases as the terminal shaft moves in the “increase” fuel (or steam) direction.
With the unit running on-speed under steady-state conditions, the resultant
spring force and force from the current in the solenoid coils are equal but
opposite.
Assume the unit is running on-speed under steady-state conditions. The pilot
valve plunger is centered. A decrease in voltage input to the solenoid coils—due
to a decrease in speed setting or a decrease in load—decreases the force
tending to lower the pilot valve plunger. Consequently, the unchanged spring
force is now greater and lifts the plunger above center. As oil escapes from
under the power piston, the terminal shaft rotates in the “decrease” fuel (or
steam) direction. When the terminal shaft has rotated far enough to satisfy the
new fuel requirement, the increase in restoring spring force will “equal” the
decrease in downward force from the current in the solenoid coils, and the pilot
valve plunger will be re-centered by the again equal but opposite forces acting
upon it.
Were the voltage signal input to the solenoid coils increased—due to an increase
in load or an increase in speed setting—similar but opposite reactions would
occur. The now greater downward force from the solenoid coils would move the
pilot valve plunger down. The power piston and restoring lever would be moved
up, decreasing the downward force of the restoring spring. When the terminal
shaft would have rotated far enough to satisfy the new fuel requirement, the
decrease in restoring spring force would “equal” the increase in downward force
from the current in the solenoid coils and the pilot valve plunger would be re-
centered by the again equal but opposite forces acting upon it.
EG-3P Actuator (with Compensation)
Description
Many EG-3P actuators operate with oil supplied directly from the prime mover.
Certain multi-viscosity motor oils require a compensation system within the
actuator to provide needed stability.
The EG-3 proportional actuator can be supplied from the factory with a
compensation system. The compensation system will supply extra hydraulic
pressure to the pilot valve plunger to assist the plunger’s return to a normal,
centered position following a fuel change. Figure 1-2 is a schematic of the
compensation system.

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6 Woodward
Figure 1-2. EG-3PC Schematic
Buffer System
With a fuel change, the new position taken by the loading piston changes the
pressure of the compensation oil, temporarily. The new pressure causes a
pressure difference across the compensation land and this assists in re-
centering the plunger. The buffer piston is also displaced by the pressure
difference and this energy is stored in the buffer springs. As the engine returns to
speed, the pressure difference stored by the buffer system is dissipated through
the needle valve.
EG-1P and EG-1PC
The EG-1 P and EG-1 PC (with compensation) actuators offer reduced work
output and faster response time than the EG-3 units. The quick response
variation is built in both the oil pump and oil motor model.

Manual 82560 EG-3P Actuator
Woodward 7
All adjustment, maintenance and other information contained in this manual is
equally applicable to the EG-1 model. Many parts are interchangeable. Since
part designations in this manual are reference numbers, not actual part numbers,
parts for the EG-1 may be ordered from this manual as well as parts for the
EG-3P and EG-3PC actuators.
Needle Valve Adjustment
The needle valve is factory set at two turns out from closed. If instability is
experienced during operation with cold multi-viscosity oils the needle valve can
be turned in until stability is obtained. The actuator should not be run at a needle
valve opening of less than one turn out from closed as response would not be
acceptable. A wider needle valve opening provides quicker actuator response
but less stability. This adjustment must be made at startup, before engine oil
warms up. See Figure 1-3 for the needle valve location.
Figure 1-3. Needle Valve Location

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8 Woodward
Parts
Six additional parts are added to the base for the EG-proportional-compensated
actuator. The configuration of the base is also slightly changed. The additional
parts are shown in Figure 1-4. A needle valve with O-ring is added to the case.
Ref. No. Part Name............................. Quantity
82560-107 Snap Ring...........................................1
82560-108 Buffer Plug..........................................1
82560-109 O-ring..................................................1
82560-110 Buffer Spring.......................................2
82560-111 Buffer Piston.......................................1
82560-112 O-ring..................................................1
82560-113 Needle Valve ......................................1
Figure 1-4. Parts for Compensation
NOTE
If the unit will not be activated within three months of delivery, place an
adequate desiccant in the packing to help keep the actuator free of rust
formation.

Manual 82560 EG-3P Actuator
Woodward 9
Chapter 2.
Installation
Introduction
Take care to mount the actuator “square” with the engine (or turbine) linkage.
If the actuator is one driven by the engine or some other source, a gasket should
be placed between the base and the base mounting pad. The gasket must not
block the two drain holes adjacent to the centering pilot of the base (see Figure
4-3).
NOTE
Seal the oil supply hole in the base with a gasket when it is not being used.
See Figure 4-5, Note 2.
Oil draining through the drive shaft bore must flow freely to sump. The splined
drive shaft must fit into the drive with a free, slip fit; no tightness is permitted. The
actuator must drop onto the mounting pad of its own weight without applying
force.
Horizontal mounting configurations are provided with a drain in the cover (Figure
4-1 parts 83 and 84). Drain through the base is plugged.
Jumper wire connections C and D of the mating connector to the actuator (see
Figures 4-3 and 4-4).
Linkage Attachments
Adjustment of the fuel linkage must provide for control of fuel from “OFF” to
“FULL FUEL” within the limits of the 42° of actuator output shaft travel. It must
also provide for approximately 28° output shaft travel between “NO LOAD” and
“FULL LOAD,” (See Figure 2-1).
The engine linkage must be free of binding and without backlash. If there is a
collapsible member in the linkage, be sure it does not yield each time the
actuator moves the linkage rapidly.
Figure 2-1. Recommended Actuator Output Shaft Travel Adjustment

EG-3P Actuator Manual 82560
10 Woodward
NOTE
Maximum work capacity over full governor travel of 42° is *. See Figure 2-1
for recommended governor output travel. In special applications, min and
max prime mover stops may be outside the governor stops.
*—See Table 1-1 for values.
WARNING—MINIMUM/MAXIMUM FUEL POSITIONS
Be sure to allow sufficient overtravel at each end of the output shaft so that
the actuator can shut down the prime mover and also give maximum fuel
when required.
Shaft Driven Oil Supply
A 3/8” (~9.5 mm) OD tubing oil line must be connected from the oil supply to
either of two 1/8” (~3.2 mm) pipe tapped inlet holes in the actuator case. A
minimum of 5 psi (34 kPa) oil pressure is required at the actuator end of the line.
If a separate sump is used (rather than engine lubricating oil), the lift head must
not exceed 12” (30 cm) and a foot valve should be used.
Oil Motor Oil Supply
A 3/8” (~9.5 mm) OD tubing oil line must be connected to the inlet hole in the
case. See Figure 4-4. Some actuators require an additional 3/8” (~9.5 mm)
supply through an appropriate orifice directly to the oil motor.
Oil Supply Filtration
Shaft-driven oil-pump models require a 20 to 25 µm (nominal) filter in the oil-
supply line. This fitter is omitted in units supplied directly from the motor through
the base.
Oil motor models require a 10 to 15 µm (nominal) filter in the oil supply line.
To avoid possible damage to the actuator the units must not be run with the filter
off or bypassed.
Factory Adjustments
NOTE
Make the following adjustments on a bench with the proper equipment. All
adjustments are preset at the factory to the proper specification for your part
number.

Manual 82560 EG-3P Actuator
Woodward 11
Pilot Valve Centering
Refer to Figure 4-1b (oil motor model), for the item numbers used in the following
information. Initial adjustment consists of physically centering the magnet (74)
between the coils of the transducer (100) when the control land on the pilot valve
plunger (81) is centered over the control port in the pilot valve bushing (26). This
minimizes the effect of temperature drift when changes occur in the operating
temperature of the actuator.
Figure 2-2. Actuator Test Circuit
CAUTION—CENTERING SPRINGS
Bottom the centering screw (71) very gently to prevent damage to the
centering springs in the coil cover.
Center the pilot valve plunger as follows:
1. Connect the test circuit to the terminal block on the actuator as shown in
Figure 6. Set the test switch to OFF.
2. Install and secure the protractor over the terminal shaft. Install the actuator
terminal lever for use as an indicator. Rotate the terminal shaft over its full
range of travel. Note or mark the minimum and maximum shaft positions on
the protractor. The total terminal shaft travel should be 42 to 45 degrees.
NOTE
The magnet is centered at the factory and seldom needs to be readjusted.
Do not change this adjustment unless thoroughly familiar with the
adjustment procedure.
3. Insert a 7/64 inch Allen wrench through the clearance hole in the center of the
cover, through the hollow center of the adjustable spring seat (70), and
engage the centering screw (71). Turn the centering screw CW until it bottoms
GENTLY, then CCW 1 3/4 to 2 turns to establish an initial starting position.
NOTE
For an oil pump unit, drive the unit on the test stand at any speed between
1200 to 3600 rpm.
For an oil motor unit, mount it on the test stand, turn on the oil supply and
allow a few minutes for the actuator to warm up to operating temperature.
Make certain the oil motor is operating by observing if the splined end of the
pilot valve bushing is rotating.

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12 Woodward
4. Set the test switch to CENTER and adjust the potentiometer for 400 mA on
the milliammeter. Set the test switch to OFF.
5. Insert a 1/8 inch Allen wrench through the clearance hole in the center of
the cover, and engage the adjustable spring seat. Center the terminal shaft
at the approximate mid point of its travel. Turn the spring seat CW to move
the terminal shaft in the increase fuel direction or CCW to move the terminal
shaft in the decrease fuel direction. Note the exact position of the terminal
shaft for future reference.
6. Set the test to CENTER and observe the terminal shaft for rotation. If
necessary, readjust the potentiometer for 400 mA.
If the terminal shaft remains stationary, when shifting from 0 to 400 mA, the
pilot valve plunger is centered and no further centering adjustments are
required.
If the terminal shaft moves to another position when switching from OFF to
CENTER, note the direction of movement and then set the test switch to
OFF.
7. If the terminal shaft moves in the increase fuel direction, turn the pilot valve
centering screw CW a small amount using the 7/64 inch Allen wrench. If the
terminal shaft movement was in the decrease fuel direction, turn the
centering screw CCW.
Note the new position of the terminal shaft for reference if further adjustment
is required.
8. Repeat steps 6 and 7 until no movement of the terminal shaft occurs when
the test switch is moved from OFF to CENTER.
9. Set the test switch to OFF and turn the potentiometer fully CCW (decrease).
Terminal Shaft Travel
1. Remove cover (6 on Figure 4-1b) for access to feedback bracket (47).
NOTE
Fasten sub cap (8) to case (22) with shorter screws.
2. Set the test switch to normal.
3. Adjust the potentiometer to 20 mA.
CAUTION—USE 1/8 INCH WRENCH ONLY
Check carefully that the Allen wrench being used to set the adjustable
spring seat is 1/8 inch. Should an undersized Allen wrench be used, the
centering adjustment could be changed, putting the actuator completely out
of adjustment. DO NOT USE AN UNDERSIZE WRENCH.
4. Using a 1/8 inch Allen wrench, turn the ad just-able spring seat CCW until
the actuator terminal lever is at its minimum fuel position, then turn the seat
CW until the shaft moves 2° to 3° from its minimum fuel position towards
maximum fuel position.

Manual 82560 EG-3P Actuator
Woodward 13
5. Adjust the potentiometer for 160 mA. The terminal shaft should move an
additional 36 (±1/2) degrees in the increase fuel direction.
NOTE
To increase terminal shaft travel, move the feedback bracket pivot pin (47)
towards the terminal shaft.
6. Repeat the adjustments at minimum and maximum current alternately, until
no further adjustment is required at either point and 36 (±1/2) degrees
rotation is obtained.
7. Replace the cover.
8. Recheck the range and if adjustment is required, adjust spring seat (70)
through the vent hole in the cover. Use a 1/8 inch Allen wrench to make this
adjustment.
9. Disconnect the test circuit and the oil supply line if used. Remove the
protractor.
Control Box
Set the gain and reset controls on the control box at their mid-positions and the
speed setting potentiometer at minimum speed. Start the engine using the speed
setting potentiometer to bring the speed to the speed-no-load level.
WARNING—EMERGENCY STOP
Be ready to manually overcome the actuator output shaft in case the speed
setting potentiometer is connected to call for maximum rather than minimum
speed.
Stability is achieved through adjustment of the reset-droop and the gain controls.
After achieving stability turn the gain control clockwise until unstable. Now
readjust the reset-droop control until stability is achieved again. The objective is
to have the gain control as far clockwise as possible while still maintaining stable
operation.
In units designated EGB-3PC, a needle valve is present in the case (see Figure
4-3). The needle valve normally operates at two turns out from closed. If stability
cannot be obtained at this setting close the valve slightly. The needle valve must
be set at least one turn out from closed to provide satisfactory operation. Now
readjust the reset-droop control until stability is achieved again. The objective is
to have the gain control as far clockwise as possible while still maintaining stable
operation.
The shaft-driven EG-3P actuator (most often used) requires about 3/4 volt to
move the terminal shaft from the minimum stop. Six or seven volts are required
to move the terminal shaft to maximum stop. Some EG-3P actuators require less
voltage for full travel.

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14 Woodward
Chapter 3.
Troubleshooting
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.
NOTE
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.
WARNING—EMERGENCY STOP
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.
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.
CAUTION—RECHECK TERMINAL SHAFT TRAVEL
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.
WARNING—START-UP
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.

Manual 82560 EG-3P Actuator
Woodward 15
Chapter 4.
Replacement Parts
When requesting additional information concerning governor operation or when
ordering parts, the following information must accompany the request:
• Governor serial number (shown on nameplate)
• Manual number (this is manual 82560)
• Part reference number, name of part, or description of part
Parts for Figures 4-1a and 4-1b
Ref. No. Part Name .............................Quantity
82560-1 Screw, # 1/4 - 28 vent........................1
82560-2 Washer, -.265 ID copper....................1
82560-3–5 Not used
82560-6 Cover .................................................1
82560-7 Gasket (cover-spacer-case)...............2
82560-8 Adapter spacer assembly...................1
82560-9 Drive screw........................................2
82560-10 Nameplate..........................................1
82560-11 Needle bearing...................................2
82560-12 Oil seal...............................................2
82560-13 Dowel pin ...........................................2
82560-14 Connector gasket...............................1
82560-15 Connector receptacle-4 pin................1
82560-16 Washer, #4 splitlock...........................4
82560-17 Screw, #4-40 X 5/16 rd. hd.................4
82560-18–20 Not used
82560-21 Pipe plug, 1/16 NPTF, soc. hd. ..........4
82560-22 Not used
82560-23 Case plug (short plug)........................1
82560-24 O-ring.................................................2
82560-25 O-ring.................................................1
82560-26 Pilot valve bushing.............................1
82560-27 Not used
82560-28 Idler gear stud....................................1
82560-29 Idler gear assembly............................1
82560-30 Piston.................................................2
82560-31 Pipe plug, 1/8-27, Hex Soc. ...............3
82560-32 Sleeve, relief valve.............................1
82560-33 Plunger...............................................1
82560-34 Spring, relief valve..............................1
82560-35 Spacer, relief valve.............................1
82560-36 Actuator base, oil motor.....................1
82560-37 Stop, servo piston ..............................1
82560-38 O-ring, 0.754 OD................................1
82560-39–41 Not used
82560-42 Base plug (long plug).........................1
82560-43 Washer, #10 splitlock.........................2
82560-44 Screw, #10-24 X 1 soc. hd.................2
82560-45 Actuator base, gear pump..................1
82560-46 Cotter pin, 1/16 X 1/2.........................4
82560-47 Feedback adjusting bracket assembly1
82560-48 Roll pin...............................................2
82560-49 Screw, #8-32 X 7/16 fill. hd. ...............2
82560-50 Lockwasher #8...................................2
82560-51 Washer, .174 ID steel.........................2
82560-52 Feedback lever assembly...................1
82560-53 Not used
82560-54 Roll pin...............................................2
82560-55 Lever (short).......................................1
Ref. No. Part Name.............................Quantity
82560-56 Rod assembly.....................................2
82560-57 Drilled straight pin...............................1
82560-58 Lever (long) ........................................1
82560-59 Terminal shaft.....................................1
82560-60 Feedback link pin................................1
82560-61 Feedback link .....................................1
82560-62 Restoring link......................................1
82560-63 Washer, 0.296 OD..............................2
82560-64 Screw, #10-32 X 2 soc. hd cap
torque screw 64 to 17 lb-in..................2
82560-65 Washer, #10 splitiock..........................2
82560-66 Drilled headed pin...............................1
82560-67 Restoring spring lever assy.................1
82560-68 Drilled straight pin...............................1
82560-69 Transducer clamp bracket..................1
82560-70 Adjustable spring seat ........................1
82560-71 Screw, socket hd. Nyloc .....................1
82560-72 Washer, 0.375 OD..............................1
82560-73 Not used
82560-74 Magnet assembly................................1
82560-76 Washer, 0.223 OD..............................1
82560-76–77 Not used
82560-78 Spring.................................................1
82560-79 Retaining ring .....................................1
82560-80 Compensating bushing.......................1
82560-81 Pilot valve plunger ..............................1
82560-82 Screw, 1/4-28 X 3/8 hex .....................1
82560-83 Plug, 1/4-18 NPTF..............................3
82560-84 Cover, horizontal mounting.................1
82560-85 Actuator case, horizontal mtg. ............1
82560-86 Seal ring (base to case)......................1
82560-87 Idler gear stud.....................................2
82560-88 Idler gear assembly ............................2
82560-89 Gasket (base to drain adapter)...........1
82560-90 Drain adapter......................................1
82560-91 Screw, 5/16-24 X 3 1/2 hex hd............1
82560-92 Washer...............................................1
82560-93 Washer, 5/16 splitlock.........................1
82560-94 Hex nut, 5/16-24.................................1
82560-95 Actuator case, oil motor horizontal......1
82560-96–98 Not used
82560-99 Plug ....................................................2
82560-100 Transducer assembly .........................1
82560-101 Top coil retainer..................................1
82560-102 Centering spring assembly .................1
82560-103 External retaining ring, 0.461 free dia.2
82560-104 Screw..................................................4
82560-105 Base (oil motor)..................................1
82560-106 Base (horizontal mounting)................ 1

EG-3P Actuator Manual 82560
16 Woodward
Figure 4-1a. Exploded View (EG-3P with Gear Pump)