Product Specification

03102 (Rev. E)

3161 Governor
for control of engines
and steam turbines

The governor has its own sump for quick

startup response. Direction of rotation of
the governor drive is set at the factory, but • Isochronous or
can be changed in the field by turning the droop control
pump housing.
• Manual, electric,
Torque Rise to limit high speed torque,
pneumatic speed
and Low Idle Offset to provide increased
low speed, no-load stability, and reduce setting options
undershoot and stalling are among the
• Manual, electric,
many governor options.
hydraulic
shutdown options
DESCRIPTION
• Fuel limiting
The 3161 is a mechanical hydraulic options
governor capable of droop or isochronous
operation. A variety of speed setting, fuel • Torque rise, low
limiting, and shutdown options may be idle offset options
added to the cover of the governor,
making it extremely versatile for a variety • Terminal position
of installations. indicator
The 3161 uses an integral Gerotor pump,
driven by the governor drive shaft, to • Operates with
provide hydraulic oil pressure. Oil engine oil or self-
pressure within the governor is contained sump
maintained by a relief valve accumulator.
Governor drive is 5/8" 36 or 5/8" keyed • Directly
(16 mm). The 3161 can be equipped with interchangeable
a standard UG8 base and standard UG8 with the UG8
APPLICATION terminal shafts.
The 3161 governor is designed for speed A rotating ballhead and pilot valve plunger
control of diesel engines, gas engines, or assembly controls the flow of hydraulic oil
steam turbines. The variety of standard that operates the governor power piston
features and available options makes the and terminal shaft. A spring-driven, oil-
governor ideal for use in a wide variety of damped ballhead is available to dampen
applications which require work capacity high-frequency, low-amplitude torsional
of up to 24 Nxm (18 lb-ft). Applications vibrations.
include off-highway vehicles, industrial,
Pressure compensation provides
marine, generator set, compressor, or
governor stability. Compensation is
pump drives.
adjustable with a needle valve to match
3161 operation can be isochronous for governor response to the engine. Pilot
accurate constant speed or frequency valve bushing porting and special springs
control, or droop for load sharing. The in the compensation system can be
amount of droop may be changed specified to vary governor response.
internally or with an optional external
lever.
SPECIFICATIONS
Control Characteristics
Steady State Speed Band Less than ±0.25% of rated speed.
Output Travel 42° maximum. Woodward recommends use of 60% to 70% of the travel
from no load to full load.

Work Capacity
Three work capacities are available: 10 Nxm (7.5 lb-ft) maximum or 8 Nxm (6 lb-ft) useful with 690 kPa (100 psi)
internal operating pressure. Maximum stalled torque is 14 Nxm (10 lb-ft).
20 Nxm (15 lb-ft) maximum or 16 Nxm (12 lb-ft) useful with 1379 kPa (200 psi) internal operating pressure.
Maximum stalled torque is 27 Nxm (20 lb-ft).
28 Nxm (21 lb-ft) maximum or 24 Nxm (18 lb-ft) useful with 1379 kPa (200 psi) internal operating pressure
and larger servo. Maximum stalled torque is 38 Nxm (28 lb-ft).
Droop
Two ranges are available: Adjustable for a 0 to 5 rpm decrease in speed setting per degree of terminal
shaft travel to increase fuel.
Adjustable for a 4 to 9 rpm decrease in speed setting per degree of terminal
shaft travel to increase fuel.
Installation And Construction
Governor Designed for vertical operation, but can be tilted up to 45° from vertical.
Standard Governor Drive 5/8"-36 SAE serrations. 5/8" keyed drive shaft is also available.
Terminal Shaft (Output Shaft) May be either or both sides. The location is the same as the UG8.
100 psi Governors Have either 0.500"-36 SAE serrated or 0.562" diameter flatted output-shaft
design.
200 psi Governors Have either a 0.625"-36 SAE serrated or 0.625" diameter flatted output-shaft
design.
Case and Base Cast aluminum. Internal parts are steel.
Governor Drive Characteristics
Drive Shaft Rotation Direction Either clockwise or counterclockwise according to the orientation of the
pump housing on the case.
Maximum Drive Speed Ranges From a minimum of 400 rpm to a maximum of 1600 rpm. Constant speed
operating range is from 1000 to 1500 rpm.
100 psi Governor Requires 186 W (1/4 hp) maximum.
200 psi Governor Requires 280 W (3/8 hp) maximum.
Oil Sump Capacity
Governor Sump Holds 1.7 L. The governor can be self contained or connected to engine oil.
SAE 10 to 50 weight oil is recommended for governor operation.
Viscosity At operating temperature should be from 100 to 300 SUS. In most cases the
oil used in the engine is satisfactory for use in the governor.

Technical Manual 03101

Vibration Resistance
Vibration Tested to tracked vehicle specifications.
Weight
About 18 kg (40 lb). Exact weight determined by option package.
Operating Temperature
–29 to +107 °C (–20 to +225 °F) (with proper viscosity oil).
Optional Features
Most governor options are installed on the cover of the 3161 governor. The options can extend the overall height of
the governor, as measured from the base, to 478 mm (18.8 inches). The nominal height of the governor, without any
options, is 364 mm (14.33 inches).
Speed Setting
Manual 0.500"-36 SAE serrated Speed Adjusting Shaft. Mechanical attachments
typically use 15 to 20 degrees of the shaft's rotary travel for mechanical
drive applications.
Electric Uses a 24 Vdc permanent magnet motor. Polarity is reversed to raise and
lower the speed setting. Separate voltage adapters are available to convert
115, 230 Vac and 32, 125, and 250 Vdc to the required 24 Vdc. Maximum
life of speed setting motor is 250 000 raise/lower commands.
Rate of Speed Setting change is typically 730 governor rpm/minute on a 24 V system.
Pneumatic Standard pneumatic speed setting ranges are for 69/690 kPa (10/100 psi),
34/310 kPa (5/45 psi), and 69/413 kPa (10/60 psi). 21/105 kPa (3/15 psi) is
also available. The bellows in the pneumatic speed setting option can
operate at pressures up to 828 kPa (120 psi). The pneumatic speed setting
option can be designed for any pressure under the maximum.
Ballhead Damping
Solid Ballhead Drive Standard. A spring-driven, oil-damped ballhead is available.
Governor Limiting
Manual Load Limiting and an extremely accurate Manifold Air Pressure fuel limiter (straight line schedule only) are
available.
Torque Rise Limiters are available with precise dual or triple slopes. Torque Rise is used to limit high rpm torque,
allowing the engine to develop a broad, flat torque curve.
Low Idle Offset increases engine stability at low idle, no load by increasing droop when these conditions are present.
This feature also reduces engine speed undershoot during rapid speed-setting decreases.
Governor Shutdown
Manual Shutdown. To initiate a shutdown, the threaded handle can be pushed down or tilted in
any direction. It can be used in conjunction with the electric or pressure
shutdown.
Electric Shutdown Uses a 24, 32, or 76 Vdc electric solenoid, either energize-to-run or
energize-to-shutdown. The electric shutdown can be used in conjunction
with the manual or pressure shutdowns.
Pressure Shutdown 276 kPa (40 psi) air or hydraulic pressure causes shutdown. The device
resets when pressure drops below 138 kPa (20 psi). It can be used in
conjunction with the manual or electric shutdowns.
PO Box 1519
Fort Collins CO, USA
80522-1519
1000 East Drake Road
Fort Collins CO 80525
Ph: +1 (970) 482-5811
Fax: +1 (970) 498-3058

Distributors & Service

Woodward has an
international network of
distributors and service
facilities. For your nearest
representative, call the
Fort Collins plant or see
the Worldwide Directory
on our website.

Corporate Headquarters
Rockford IL, USA
Ph: +1 (815) 877-7441

www.woodward.com

This document is distributed

for informational purposes
only. It is not to be construed For more information contact:
as creating or becoming part
of any Woodward Governor
Company contractual or
warranty obligation unless
expressly stated in a written
sales contract.

© Woodward 1992
All Rights Reserved

06/3/F