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The UG-Actuator offers the advantages of electronic control and load sharing systems while using the convenient, existing UG-8 type drives and linkages. The actuator provides the muscle for Woodward analog controls such as the 2301, as well as Woodward digital controls such as the 500-series and 700-series. The UG-Actuator can be used with diesel, gasoline, or natural gas engines, and with steam and industrial gas turbines. The UG-Actuator has a self-contained oil sump, so a separate oil supply is not required.

The actuator operates with a low speed pump for drive speeds from 375 to 1100 rpm, and with a high speed pump for 600 to 1500 rpm. An optional cooler is available for applications with a higher drive speed or high ambient temperature.

The UG-Actuator is ideal for installations involving unattended starts.

The optional self-contained MPU simplifies the conversion of a UG-8 controlled engine or turbine to an electronically controlled engine. A gear which has been specifically designed to operate the MPU means that the electronic control will receive sharp, clean speed signals. Low speed applications may require override of the control’s fail-safe during start-up.


The UG-Actuator takes a given electrical input signal and converts it to a proportional hydraulic output-shaft position to control engine fuel flow. The standard UG-Actuator produces approximately 20 J (15 ft-lb) of work over 42 degrees of rotary output.

A UG-8 drive in good condition makes an excellent MPU signal source. Alternatively, the UG-Actuator is available with an LVDT for position feedback.

The UG-Actuator uses the same cast-iron case as the UG-8 governor. The oil pump is the proven high-output Gerotor, designed to provide long life with minimal maintenance. The actuator uses standard UG-8 output shafts, power levers, power pistons, and piston links. The base is designed to precisely fit any drive designed for a UG-8 governor, and maintenance procedures are similar to those of the UG-8 governor.

The actuator’s electric-to-hydraulic transducer uses a Woodward-built torque motor which converts the 20–160 mA control signal to a given output position.


Hydraulic Powered Electric Actuator for Engine or Turbine Control

Product Specification 37511


  • Proportional electrohydraulic actuator simplifies transfer from mechanical governing
  • Economical installation using UG-8 case and drive
  • Works with all Woodward 20–160 mA output electronic control systems
  • Self-contained oil supply
  • Integral magnetic pickup available

Fact sheet

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