Ug Governor Similarities; Hydraulic Pump; References; Serviceability - Woodward UG-25+ Installation And Operation Manual

Manual 26580
Available (for special applications at additional cost)—
0.562 / 0.625 D-shaped terminal shaft
The base is designed to fit any engine drive designed for a UG8 governor. The terminal shaft location
relative to the mounting base is similar to a UG8 governor.
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The UG-25 actuator is equipped with a Gerotor fixed displacement pump (similar to the 3161 governor
type) with a relief valve. The pump/relief valve uses oil from its self-contained sump to provide 1035 kPa
(150 psi) internal operating pressure.
Two displacements are offered to cover the speed range up to 1700 grpm. The large displacement pump
(22.22 mm / 0.875 inch thick) is intended to be used with actuator drive speeds from 350 to 1200 rpm.
Running the large displacement pump continuously above 1200 grpm will result in excessive oil
temperatures. The small displacement pump (15.88 mm / 0.625 inch thick) is designed to be used with
drive speeds between 500 and 1700 rpm maximum continuous operation.
The direction of rotation is selected by pump housing alignment. The pump operates in the selected
direction only. The drive uses a maximum of 335 W (0.45 hp).
The following publications provide additional information about installation, operation, and storage of
Woodward products. All are available on the Woodward website (www.woodward.com).
Publication
25071 Oils for Hydraulic Controls
25075 Commercial Preservation Packaging for Storage of Mechanical-Hydraulic Controls
50516 Governor Linkage for Butterfly Control Valve
03386 UG-25 + Actuator Product Specification
36684 Booster Servomotor
Contact your nearest Woodward Distributor or Authorized Independent Service Facility about repairs.
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The UG-25 actuator has no field-replaceable parts.
Woodward

UG Governor Similarities

Hydraulic Pump

References

Serviceability

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The UG-25 actuator is not equipped with an overspeed trip function.
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.
UG-25+ Actuator
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