Woodward EGB-1P User manual

Product Manual 82570
(Revision L, 8/2016)
Original Instructions
EGB-1P and EGB-2P
Governor/Actuator
Installation and Operation Manual

General
Precautions
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.
Revisions
This publication may have been revised or updated since this copy was produced.
To verify that you have the latest revision, check manual 26311 , Revision Status &
Distribution Restrictions of Woodward Technical Publications, on the publications
page of the Woodward website:
www.woodward.com/publications
The latest version of most publications is available on the publications page. If
your publication is not there, please contact your customer service representative
to get the latest copy.
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.
Translated
Publications
If the cover of this publication states "Translation of the Original Instructions"
please note:
The original source of this publication may have been updated since this
translation was made. Be sure to check manual 26311 , Revision Status &
Distribution Restrictions of Woodward Technical Publications, to verify whether
this translation is up to date. Out-of-date translations are marked with . Always
compare with the original for technical specifications and for proper and safe
installation and operation procedures.
Revisions—Changes in this publication since the last revision are indicated by a black line
alongside the text.
Woodward reserves the right to update any portion of this publication at any time. Information provided by Woodward is
believed to be correct and reliable. However, no responsibility is assumed by Woodward unless otherwise expressly
undertaken. Copyright © Woodward 1980-2016
All Rights Reserved

Manual 82570 EGB-1P/-2P Governor/Actuator
Woodward i
Contents
WARNINGS AND NOTICES..........................................................................IV
ELECTROSTATIC DISCHARGE AWARENESS .................................................V
CHAPTER 1. GENERAL INFORMATION..........................................................1
Introduction.............................................................................................................1
Description..............................................................................................................2
CHAPTER 2. INSTALLATION PROCEDURES...................................................7
General Installation.................................................................................................7
Linkage Adjustment................................................................................................7
Electrical Connections............................................................................................8
Governor/Actuator Drive.........................................................................................8
Oil Supply ...............................................................................................................8
CHAPTER 3. PRINCIPLES OF OPERATION...................................................12
Introduction...........................................................................................................12
Actuator Control....................................................................................................13
Governor Control..................................................................................................13
Speed Droop ........................................................................................................15
CHAPTER 4. ADJUSTMENTS......................................................................18
Introduction...........................................................................................................18
Recommended Tools ...........................................................................................18
Preliminary Adjustments.......................................................................................18
Governor Needle Valve Setting............................................................................19
Speed Droop Adjustment .....................................................................................20
Centering Pilot Valve Plunger ..............................................................................20
Speed Adjustment................................................................................................22
Adjustments after Tests........................................................................................23
CHAPTER 5. MAINTENANCE......................................................................24
Introduction...........................................................................................................24
Troubleshooting....................................................................................................24
Removing the EGB-2P.........................................................................................25
Disassembly .........................................................................................................26
Parts Check..........................................................................................................29
Assembly..............................................................................................................29
Manual Override Assembly (optional) ..................................................................48
Lubrication............................................................................................................49
CHAPTER 6. AUXILIARY DEVICES..............................................................50
Introduction...........................................................................................................50
Manual and Pneumatic Overrides for Actuator ....................................................50
Spring Driven Ballhead.........................................................................................50
Magnetic Pickup ...................................................................................................50
CHAPTER 7. REPLACEMENT PARTS ..........................................................52
Introduction...........................................................................................................52
CHAPTER 8. PRODUCT SUPPORT AND SERVICE OPTIONS...........................55
Product Support Options......................................................................................55
Product Service Options.......................................................................................55
Returning Equipment for Repair...........................................................................56
Replacement Parts...............................................................................................56
Engineering Services............................................................................................57
Contacting Woodward’s Support Organization ....................................................57
Technical Assistance............................................................................................58

EGB-1P/-2P Governor/Actuator Manual 82570
ii Woodward
Illustrations and Tables
Figure 1-1. EGB-2P Governor/Actuator .................................................................1
Figure 1-2. EGB-2P and -1P Work Output.............................................................2
Figure 1-3. Solenoid Shutdown Connection...........................................................5
Figure 1-4. Outline Drawing of EGB-2P Governor/Actuator...................................6
Figure 3-1. Schematic Diagram of EGB-2P Governor/Actuator...........................17
Figure 4-1. Speed Setting Adapter Plate..............................................................19
Figure 4-2. Actuator Test Circuit...........................................................................21
Figure 5-1. Pilot Valve Wrench.............................................................................26
Figure 5-2. Ballhead Disassembly........................................................................28
Figure 5-3. Check Valve Installation.....................................................................29
Figure 5-4. Speeder Spring Parts Layout.............................................................30
Figure 5-5. Speeder Spring Subassembly ...........................................................30
Figure 5-6. Mechanical Governor Pilot Valve Assembly......................................30
Figure 5-7. Actuator Pilot Valve Assembly...........................................................31
Figure 5-8. Clamp Bracket Parts Layout ..............................................................31
Figure 5-9. Clamp Bracket Subassembly.............................................................31
Figure 5-10. Ballhead Parts Layout......................................................................32
Figure 5-11. Ballhead Cover Assembly................................................................32
Figure 5-12. Ballhead Assembly...........................................................................33
Figure 5-13. Buffer System Parts Layout .............................................................33
Figure 5-14. Needle Valve Assembly...................................................................34
Figure 5-15. Parts Layout, Pistons and Levers ....................................................34
Figure 5-16. Power Piston Assembly (Large Size Piston) ...................................35
Figure 5-16a. Power Piston Assembly (Small Size Piston)..................................35
Figure 5-17. Power Piston Linkage Assembly......................................................36
Figure 5-17a. Obtaining Rocking Motion In Power Pistons..................................36
Figure 5-17b. Raising Power Pistons...................................................................37
Figure 5-17c. Dropping Power Pistons.................................................................37
Figure 5-17d. Removing Play in Power Piston Assembly....................................38
Figure 5-17e. Removing Play in Assembly ..........................................................38
Figure 5-18. Piston Placement .............................................................................39
Figure 5-19. Piston Link Assembly.......................................................................39
Figure 5-20. Base and Parts.................................................................................39
Figure 5-21. Bushing Assemblies.........................................................................40

Manual 82570 EGB-1P/-2P Governor/Actuator
Woodward iii
Illustrations and Tables (cont'd.)
Figure 5-22. Relief Valve & Piston Sleeve Assembly...........................................40
Figure 5-23. Ballhead Assembly ..........................................................................41
Figure 5-24. Thrust Bearing & Spring Seat Assembly .........................................41
Figure 5-25. Centering Pilot Valve Plunger..........................................................42
Figure 5-26. Base Assembly ................................................................................42
Figure 5-27. Transducer Parts Assembly.............................................................43
Figure 5-28. EGB-2P Diagram .............................................................................43
Figure 5-29. Plug & Transducer Installation.........................................................44
Figure 5-30. Clamp Bracket Assembly.................................................................44
Figure 5-31. Transducer Compression Spring & Ratio Adjustment Plate............44
Figure 5-32. Terminal Shaft Installation ...............................................................45
Figure 5-33. Speed Droop Lever..........................................................................45
Figure 5-34. Speed Droop Lever Assembly.........................................................46
Figure 5-35. Dial Plate & Seal Assembly .............................................................46
Figure 5-36. Speed Adjusting Shaft Assembly.....................................................47
Figure 5-37. Cover Assembly...............................................................................47
Figure 5-38. Final Assembly.................................................................................47
Figure 5-39. Final Assembly.................................................................................48
Figure 5-40. Manual Override Parts Layout.........................................................48
Figure 6-1. Manual Override Assembly................................................................51
Figure 6-2. Cover with Manual Override ..............................................................51
Figure 7-1. EGB-2P Exploded View.....................................................................54
Table 2-1. Oil Chart ..............................................................................................11
Table 2-2. Viscosity Comparisons........................................................................11

EGB-1P/-2P Governor/Actuator Manual 82570
iv Woodward
Warnings and Notices
Important Definitions
This is the safety alert symbol. It is used to alert you to potential
personal injury hazards. Obey all safety messages that follow this
symbol to avoid possible injury or death.
DANGER—Indicates a hazardous situation which, if not avoided, will result
in death or serious injury.
WARNING—Indicates a hazardous situation which, if not avoided, could
result in death or serious injury.
CAUTION—Indicates a hazardous situation which, if not avoided, could
result in minor or moderate injury.
NOTICE—Indicates a hazard that could result in property damage only
(including damage to the control).
IMPORTANT—Designates an operating tip or maintenance suggestion.
Overspeed /
Overtemperature /
Overpressure
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.
Personal Protective
Equipment
The products described in this publication may present risks that
could lead to personal injury, loss of life, or property damage. Always
wear the appropriate personal protective equipment (PPE) for the job
at hand. Equipment that should be considered includes but is not
limited to:
Eye Protection
Hearing Protection
Hard Hat
Gloves
Safety Boots
Respirator
Always read the proper Material Safety Data Sheet (MSDS) for any
working fluid(s) and comply with recommended safety equipment.
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.
Automotive
Applications
On- and off-highway Mobile Applications: Unless Woodward's control
functions as the supervisory control, customer should install a
system totally independent of the prime mover control system that
monitors for supervisory control of engine (and takes appropriate
action if supervisory control is lost) to protect against loss of engine
control with possible personal injury, loss of life, or property damage.

Manual 82570 EGB-1P/-2P Governor/Actuator
Woodward v
Battery Charging
Device
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.
Electrostatic Discharge Awareness
Electrostatic
Precautions
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.
To prevent damage to electronic components caused by improper
handling, read and observe the precautions in Woodward manual
82715, Guide for Handling and Protection of Electronic Controls,
Printed Circuit Boards, and Modules.
Follow these precautions when working with or near the control.
1. Avoid the build-up of static electricity on your body by not wearing clothing
made of synthetic materials. Wear cotton or cotton-blend materials as much
as possible because these do not store static electric charges as much as
synthetics.
2. Do not remove the printed circuit board (PCB) from the control cabinet
unless absolutely necessary. If you must remove the PCB from the control
cabinet, follow these precautions:
Do not touch any part of the PCB except the edges.
Do not touch the electrical conductors, the connectors, or the
components with conductive devices or with your hands.
When replacing a PCB, keep the new PCB in the plastic antistatic
protective bag it comes in until you are ready to install it. Immediately
after removing the old PCB from the control cabinet, place it in the
antistatic protective bag.

EGB-1P/-2P Governor/Actuator Manual 82570
vi Woodward
Regulatory Compliance
North American Compliance:
These listings are limited only to those EGB2P Governors bearing the CSA
identification.
CSA: CSA Certified for Class I, Division 2, Groups A, B, C, & D, T4 at
93 °C ambient. For use in Canada and the United States.
CSA 1987834.
Special Conditions for Safe Use:
Wiring must be in accordance with North American Class I, Division 2 wiring
methods as applicable, and in accordance with the authority having jurisdiction.
Field wiring must be suitable for at least 125 °C.
Connect ground terminal to earth ground.

Manual 82570 EGB-1P/-2P Governor/Actuator
Woodward 1
Chapter 1.
General Information
Introduction
Figure 1-1. EGB-2P Governor/Actuator
This manual provides description, installation, operation, adjustments,
maintenance, auxiliary devices and replacement parts information for the
EGB-2P Governor/Actuator.
The EGB-1P is used in high performance applications requiring fast acting
responses with lower work output. The EGB-1P has the same mounting pad,
drive shaft and terminal shaft configuration as the EGB-2P. Internal parts are
also identical except for the power piston. The EGB-1P uses a smaller size
power piston (see Figures 5-16a and 7-1).
Information given in this manual regarding the EGB-2P also applies to the
EGB-1P.

EGB-1P/-2P Governor/Actuator Manual 82570
2 Woodward
The EGB-2P and -1P actuators are proportional electro-hydraulic actuators
combined with isochronous or droop mechanical-hydraulic governors. Both
actuators have 32 degrees of maximum output shaft travel. Recommended travel
from the no load to the full load position is 2/3 of full actuator travel.
See Figure 1-2 for a graphic representation of maximum work capacity for the
actuator, and related actuator output shaft travel information.
A description of the EGB-2P governor/actuator is given in this chapter. This
information includes general information about the system, the available
adjustments, and the different arrangements available.
Figure 1-2. EGB-2P and -1P Work Output
Description
Governor/Actuator
The EGB-2P is a proportional actuator with a mechanical backup governor. The
proportional actuator’s terminal (output) shaft position is directly proportional to
the magnitude of the output signal from the electronic control unit. The uses and
functions of a proportional actuator are different and distinct from integrating
types of EG actuators. The EGB-2P actuator must be used with the Woodward
2301 or 2500 integrating electronic control to form a complete governing system.
By comparison, the EGB-2C is an integrating actuator with the companion EGA
control box being basically a proportional amplifier.
While proportional actuators can be Used in the same type of service as other
actuator models, they are particularly well suited to engines operating in tandem to
drive a common load. In such installations, one electric control can be used for two
proportional actuators wired in series with the control’s output, to furnish the same
input signal to each actuator. Since each actuator receives the same signal, their
output shafts take the same position and give each engine the same fuel.
Externally, the EGB-2P is similar in size and appearance to the EGB-2C
actuator. Internally, each has two sections: an electric actuator section and a
mechanical governor section. The mechanical governor section acts as a backup
governor in the event of failure of the electric control. The electric actuator
section is different in function and construction. The actuator section of the EGB-
2P includes feedback linkage from its power piston to its pilot valve to give the
proportional feature to the actuator.

Manual 82570 EGB-1P/-2P Governor/Actuator
Woodward 3
The proportional actuator requires a continuous electric input signal (in contrast
to the nominally zero input signal under steady-state conditions for integrating
type actuators). Woodward electronic controls are used to furnish the control
input signal for the proportional actuator. The exact control used depends on the
operating scheme of the installation. Control assemblies are available to sense
speed, frequency, load, and other combinations.
The essential element of the actuator section of the EGB-2P is an electro-hydraulic
transducer which directs pressure oil to and from the power piston to actuate the
fuel or steam control mechanism. The transducer consists of a solenoid attached to
the pilot valve plunger to control oil flow to and from the power piston. The solenoid
responds to the given output of the electric control, and, in so doing, moves the
pilot valve plunger down directing oil to the power piston. Through connecting
linkage, the power piston moves the terminal shaft of the actuator. The engine or
turbine fuel linkage attaches to the actuator terminal shaft.
While strict linearity of terminal shaft travel versus load is not required, we
recommend that the linkage be arranged to give the same degree for linearity
afforded conventional speed sensing governors.
The mechanical governor section has three operating adjustments. Once set,
these adjustments do not usually require further adjustment.
1. Speed setting; an external adjustment Used to set the speed at which the
mechanical governor will control.
2. Speed droop; an internal adjustment used to permit parallel operation of
units controlled by the mechanical governor.
3. Needle valve; an external adjustment used to stabilize the mechanical
governor. See Figure 1-4 for adjustment location.
The actuator section of the EGB-2P has no external operating adjustments.
The actuator uses oil from the engine lubricating system or from a separate sump
(not furnished by Woodward). It does not have a self-contained sump.
EGB-2P governor/actuators are available with the terminal shaft extending from
either or both sides of the case. They can be furnished with the speed adjusting
shaft (for the mechanical governor section) extending on either side. However,
most units use a speed adjusting screw in the top cover and omit the speed
adjusting shaft entirely.
Direct and Reverse Acting Types
EGB-2P actuators are available in either the direct or the reverse acting type.
The direct acting actuator operates with electronic controls which produce an
increasing positive voltage to the actuator as fuel increase is required. Pin A is
positive and pin B in actuator receptacle is negative, see Figure 5-28. The
terminal shaft of the direct acting actuator goes to shutdown on loss of control
voltage and thus provides a failsafe feature. However, mechanical governing
control will not start on its own, operator intervention is needed, and one of three
ways must be used to operate the actuator:
1. A 9 to 12 V battery placed across A (+) & B (–). (See Figure 5-28.)

EGB-1P/-2P Governor/Actuator Manual 82570
4 Woodward
2. A pneumatic start device, using an 80 to 240 psi (550 to 1650 kPa) air
signal. (See Auxiliary Devices. Chapter 6.)
3. A manual override device, by pushing and turning a knob mounted on top of
the EGB-2P. (See Auxiliary Devices, Chapter 6.)
All three methods hold the actuator pilot valve below center to keep the actuator
piston in its full up position as needed to obtain mechanical governor control.
When using a reverse acting actuator, none of the above is needed as a loss of
control voltage causes the actuator to go to maximum fuel.
The reverse acting actuator operates with electronic controls which produce a
decreasing positive voltage to the actuator as a fuel increase is required. Pin A is
positive and pin B is negative in the actuator receptacle, see Figure 5-28. The
terminal shaft of the reverse acting actuator goes to maximum fuel on loss of
control voltage. The transfer from electrical actuator operation to mechanical
governor operation takes place on its own. This is not meant to imply that an
automatic operational transfer will take place (same speed setting, same load
sharing capability).
To change a direct acting actuator to a reverse acting actuator or
vice versa, the actuator calibration must be changed as well as the
internal wiring polarity.
Speed Droop
Speed droop is adjustable (internally) between zero and twelve percent.
Maximum amount of droop is reduced if terminal shaft travel is shortened. Speed
droop permits load division between two or more engines driving generators
operating in parallel or driving a common load on a single shaft. If the engine is
operated alone the governor may be set for zero droop (isochronous operation).
Parallel engine-generator units should have droop set sufficiently high to prevent
the units from interchanging load. If one unit in the plant or system has enough
capacity, its governor may be set on zero droop to provide isochronous
operation. By maintaining constant speed, this unit regulates the frequency of the
entire system. lsochronous operation permits this unit to absorb all load changes
within the limits of its capacity and also control frequency if its capacity is not
exceeded.
The system frequency is adjusted by changing the speed setting of the governor
operating isochronously. Load distribution between units is accomplished by
changing the speed setting of the governor(s) having speed droop.
External Solenoid Shutdown
Since no governor mounted shutdown device is available for this small
actuator/governor, it is common practice to apply an external solenoid for
shutdown. The solenoid allows the governor control oil to drain to the prime
mover oil sump and thus create a shutdown.

Manual 82570 EGB-1P/-2P Governor/Actuator
Woodward 5
Two factors are of primary importance in utilizing external solenoid shutdowns.
First is the location of the solenoid. Figure 1-3 following shows the proper
connection. Once a suitable connection is decided, the solenoid must be
connected with tubing runs as short as possible. The solenoid must also be
mounted below the governor and oriented so that it does not fill with air. Air
trapped by the tubing causes governor instability.
The second consideration is solenoid size. The solenoid and all connected tubing
must pass enough flow to ensure that the governor moves to minimum position
and remains there. Shutdown of the EGB-2P Governor/Actuator is accomplished
by draining oil from the increase fuel side of the compensating land on the
actuator pilot valve. This forces the pilot valve to drain control oil to move the
power piston to minimum fuel. Since this is a restricted flow, the solenoid for the
EGB-2P must flow 0.6 US gal/min (2.3 L/min) with a maximum pressure drop of
10 psi (69 kPa). Therefore, different flow capabilities are required depending on
rated governor speed.
Figure 1-3. Solenoid Shutdown Connection
The shutdown solenoid can be used for normal shutdown and/or as a backup to
the safety shutdown system. The engine, turbine, or other type of Prime Mover
should be equipped with safety systems entirely separate from the governor.
However, the safety system may be interfaced with the shutdown solenoid to
cause the governor or actuator to go to minimum during safety systems
shutdown. As with all safety shutdowns, proper operation should be confirmed
periodically. See the prime mover manufacturer’s instructions.
The shutdown solenoid must not be used as an overspeed protective
device. Overspeed protection must come from a unit completely
separate from the EGB-2P or -1P control.

EGB-1P/-2P Governor/Actuator Manual 82570
6 Woodward
Figure 1-4. Outline Drawing of EGB-2P Governor/Actuator

Manual 82570 EGB-1P/-2P Governor/Actuator
Woodward 7
Chapter 2.
Installation Procedures
General Installation
Using a gasket between the base of the unit and the mounting pad, mount the
governor/actuator unit on the mounting pad. Square the unit with the engine
linkage and in line with the drive. Fit the splined drive shaft into the drive with a
free, slip fit; no tightness is permitted. The unit must fit the mounting pad of its
own weight without any force being applied. Also, be sure there is a free
discharge of oil through the drive shaft bore and annulus within the base
mounting pilot. The drain must be a free flowing gravity drain with no back
pressure. Keep the end of the overboard drain line above the sump oil level.
The gasket must allow passage of supply oil when oil is supplied
through the base. The gasket must also allow for free discharge of
oil.
Terminal shaft angular travel is approximately 32 degrees. Design and adjust the
fuel linkage to use approximately 21° of the terminal shaft travel from no-load to
full-load. Adjustment of the fuel linkage must provide for the control of fuel from
“OFF” to “FULL FUEL” within the limits of the actuator output travel. The engine
linkage must not bind and backlash must be minimal. if there is a collapsible
member in the linkage, it must not yield when unit moves the linkage rapidly.
Relation between engine torque output and terminal shaft travel must be
approximately linear.
If the installation must be changed from vertical to horizontal, or vice
versa, a plug must be added or removed, and a new calibration is
needed. Return the unit to Woodward for calibration.
Linkage Adjustment
Maximum and minimum lines on the terminal shaft dial plate (136 on Figure 7-1)
indicate the limits of terminal shaft travel during normal operation (approximately
32°). The pointer (138) is pre-set at the factory and should not be moved.
Notice that the EGB-2P has excess travel in the decrease fuel direction when the
prime mover is not running.
Do not use the physical minimum stop of governor terminal shaft to
align fuel linkage since this position will not be reached when
operating. Instead, set the linkage so the prime mover’s fuel control
is at its minimum fuel position when the EGB-2P pointer is just above
the minimum fuel mark on the dial.

EGB-1P/-2P Governor/Actuator Manual 82570
8 Woodward
Electrical Connections
The EGB-2P is provided with a 2-pin electrical connection Bendix “RB” 2 Pole,
No. 10-42212-3P. The mating plug may be a two pole, Straight plug,
MS-3106A12S-3S. See Figure 5-28, EGB-2P Governor/Actuator Wiring
Diagrams, for direct acting and reverse acting electrical connections.
Normal input current range is 20 to 160 mA. Maximum allowable current is 200
mA during normal operation and 400 mA during centering operation. (For
information on centering operation, see Chapter 4, Adjustments.)
Governor/Actuator Drive
The actuator’s flyweight head is driven directly from the engine by the
governor/actuator drive. For best results, operate the unit in the range of 2600 to
4000 rpm at normal operating speed. One-third horsepower is required to drive it
at 3600 rpm at normal operating conditions.
A smooth drive is important to prevent false speed change signals to the
governor flyweights. Attempting to correct for these changes, results in a
continual vibration of the actuator terminal shaft and engine fuel linkage.
Normally, drive shaft rotation can be in either direction without making any
changes in the unit. Check for correct direction of rotation before actually driving
the unit.
Operating temperature range for the governor/actuator is 0 to 200 °F (–18 to +93
°C) (with proper viscosity oil).
Oil Supply
Connect a 3/8 inch O.D. tubing oil line from the oil supply to either of the two 1/8
inch pipe tapped inlet holes of the unit. A minimum of 5 psi (34 kPa) oil pressure
is required at the unit end of the line. Maximum supply pressure is 50 psi (345
kPa). If a separate sump is used (rather than engine lubricating oil), the distance
the mechanical governor must lift the oil should not exceed 12 inches (30 cm),
and a foot valve with a capacity of 2 US gal/min (7.6 L/min) must be used.
Operating oil pressure is 300 to 350 psi (2068 to 2413 kPa) plus supply oil
pressure. (Maximum supply oil pressure is 50 psi [345 kPa].)
When oil from the engine lube system is used, install a 2 US gal/min (7.6 L/min),
20 to 25 µm filter in the oil supply line. Oil supply to the governor/actuator can be
either through a supply hole in the actuator case, or through an oil inlet in the
actuator base, depending upon the option selected. See Figure 1-4, Outline
Drawing. Filter is not supplied by Woodward.
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.

Manual 82570 EGB-1P/-2P Governor/Actuator
Woodward 9
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.
Use an oil depending on operating temperature for the governor (see Table 2-1).
Primary concern is for the oil properties in the governor.
Use the information given in Tables 2-1 and 2-2 as a guide in the selection of a
suitable lubricating/ hydraulic oil. Oil grade selection is based on the operating
temperature range of the actuator. Also, use this information to aid in recognizing
and correcting common problems associated with oil used in products
manufactured by Woodward.
For applications where the actuator shares the oil supply with the engine, use the
oil recommended by the engine manufacturer.
Actuator oil is both a lubricating oil and a hydraulic oil, It must have a viscosity
index that allows it to perform over the operating temperature range and it must
have the proper blending of additives that cause it to remain stable and
predictable over this range.
Actuator oil must be compatible with seal materials (nitrile, polyacrylic, and
fluorocarbon). Many automotive and gas engine oils, industrial lubricating oils,
and other oils of mineral or synthetic origin meet these requirements. Woodward
actuators are designed to give stable operation with most oils with the viscosity,
at the operating temperature, between 50 and 3000 SUS (Saybolt Universal
Seconds). At the normal operating temperature, the viscosity should be between
100 to 300 SUS. Poor actuator response or instability may be an indication that
the oil viscosity is outside this range.
Excessive component wear or seizure in an actuator indicates the possibility of:
1. Insufficient lubrication caused by:
a. An oil that flows slowly when it is cold, especially during start-up.
b. An oil line with restrictions caused by either obstructions within or
bends in the line (for external supply actuators only).
c. No oil in the actuator.
2. Contaminated oil caused by:
a. Dirty oil containers.
b. An actuator exposed to heating up and cooling down cycles, which
creates condensation of water in the oil.
3. Oil not suitable for the operating conditions caused by:
a. Changes in ambient temperature.
b. An improper oil level which creates foamy, aerated oil.
Operating an actuator continuously beyond the high limit temperature of the oil
will result in oil oxidation. This is identified by varnish or sludge deposits on the
actuator parts. To reduce oil oxidation, lower the actuator operating temperature
with a heat exchanger or other means, or change to an oil more oxidation
resistant at the operating temperature.

EGB-1P/-2P Governor/Actuator Manual 82570
10 Woodward
A loss of stable governor control and possible engine overspeed
may result if the viscosity exceeds the 50 to 3000 SUS range.
Specific oil viscosity recommendations are given on the Oil Chart (Table 2-1).
Select a readily available good brand of oil, either mineral or synthetic, and
continue using that same brand. Do NOT mix the different classes of oils. Oil that
meets the API (American Petroleum Institute) engine service classification in
either the “S” group or the “C” group, starting with “SA” or “CA” through “SF” and
“CD” is suitable for actuator service. Oils meeting performance requirements of
the following specifications are also suitable: US MIL-L-2104A, MIL-L-2104B,
MlL-L-2104C, MlL-L-46152, MIL-L-46152A, MlL-L-46152B, MIL-L-45199B.
Be sure engine oil is kept clean and free from contamination. Dirty or
contaminated engine oil can cause poor governing control, erratic operation, and
excessive actuator/governor wear.
Any persistent or reoccurring oil problems should be referred to a qualified oil
specialist for solution.
The recommended continuous operating temperature of the oil is 140 to 200 °F
(60 to 93 °C). The ambient temperature limits are –20 to +200 °F (–30 to +93 °C).
Measure the temperature of the actuator on the outside lower part of the case.
The actual oil temperature will be slightly warmer, by approximately 10 °F (6 °C).

Manual 82570 EGB-1P/-2P Governor/Actuator
Woodward 11
Table 2-1. Oil Chart
Table 2-2. Viscosity Comparisons

EGB-1P/-2P Governor/Actuator Manual 82570
12 Woodward
Chapter 3.
Principles of Operation
Introduction
This chapter provides information concerning the functional operation of the
EGB-2P. The schematic arrangement of the EGB-2P is shown in Figure 3-1 with
parts in relative positions assumed during normal operation. Oil enters the unit
through either of the two inlet holes in the side of the base. The oil passes from
the suction to the pressure side of the pump. After filling the oil passages, the
pump builds up the oil pressure. When the pressure is great enough to overcome
the relief valve spring force and push the relief valve plunger back to uncover the
bypass hole, the oil recirculates through the pump.
Rotation of the pump in the opposite direction from that shown in Figure 3-1,
closes the open check valves and opens the closed check valves.
The loading piston positions the terminal shaft. Constant oil pressure is applied to
the upper side of the loading piston always tending to move it in the “decrease
fuel” direction. Either the governor power piston or the actuator power piston can
move the loading piston in the “increase fuel” direction since the effective area on
which the control oil pressure acts is greater on the power piston than on the
loading piston.
In the event of an electric failure, the direct acting actuator goes to minimum fuel
and thus provides a failsafe feature. However, mechanical governing control will
not start on its own. The operator must intervene and use one of two ways to
cause the actuator to become operative again.
Be sure the mechanical governor can control the prime mover speed
before the operator causes the actuator to become operative again.
Turning the speed-setting screw clockwise on the mechanical governor increases
speed setting and turning the speed-setting screw counterclockwise (anti-
clockwise) decreases speed setting.
After adjusting the speed-setting screw to ensure that the mechanical governor
will control the prime mover speed, use one of the two following methods to
cause the actuator to become operative again:
1. If the actuator is equipped with a manual override knob on the cover (see
Chapter 6), push the override knob down and turn it to the right to lock out
the actuator control.
2. If the actuator is not equipped with a manual override knob, place a 9 volt
battery across actuator terminals A (+) and B (–). See Figure 5-28.
When using a reverse acting actuator, none of the above is needed, as a loss of
control voltage causes the actuator to go to maximum fuel and mechanical
governing control starts on its own.