UG-25+ The State of the art Governor

Replace your old UG – 8 & 3161 governors and upgrade the functionality & precision of your engine!

Get superior Dynamic Performance with over 3 times the bandwidth of a mechanical governor


Combining the advantages of a traditional mechanical governor, such as UG- 8 and 3161, with state-of-the-art control algorithms, UG – 25+ will give you a much needed flexibility that will optimize your engine operation. Woodward UG – 25+ is a microprocessor controlled governor, mechanical/hydraulic amplified, that is suitable for gasoline, gas, diesel and dual fuel engine, as well as steam turbines. Ιt is a fast-acting, high work output governor that will read any alterations and respond swiftly, feeding your engine, without the need of auxiliary devices, such as a start booster. Two work output versions are available, the 25 and 31 ft-lbs.

This modern governor offers enhanced control capabilities by using a PC to adjust and download configuration data. Speed control with software selectable speed set points is easily achieved. Dynamics, fuel limiting and start behaviour are only a few of its features. Start Fuel Limiter (SFL) prevent over fueling at start-up, while Max Fuel Limiter prevents overloading at rated speed. The additional fuel limiting (jump rate) improves the engine load acceptance and reduces transient emissions significantly, thus reducing the impact on our environment.

The Front panel with its external speed settings gives you easy manual control making synchronization and load sharing easy for generator applications. The pre-set via PC service tool parameters for Droop, load limit and stability can be adjusted between 0-10%, using three external knobs on the front panel.  Adjustable droop function allows load division and balancing among parallel operated prime movers. The load limiter knob permits you to limit the governor output manually.

The UG-25+ uses a 1034 kPa (150 psi) internal operating pressure with an internal oil pump driven from the governor’s drive shaft. Oil pressure is maintained by a relief valve system with a drain to an internal oil sump.

A 4–20 mA speed setting is available for variable speed applications.

UG – 25+ Control Features at a glance:

  • State-of-the-art speed sensing and control algorithms
  • Enhanced PID dynamics
  • Configurable speed settings and adjustment rates
  • Multiple fuel limiting algorithms, such as jump-rate, boost pressure, and start fuel limiting
  • Comprehensive diagnostics for easy troubleshooting

UG – 25+ is a drop-in replacement for UG-8 and 3161 governors, as it has the same footprint. Available with either a keyed or serrated drive shaft.

This governor with all its attributes contributes to TCO reduction.

To learn more about the new UG – 25+ and make a step towards engine optimization, please email us at

Be a part of the MAS governor upgrade plan and benefit from a special discounts scheme. Even more competitive pricing for multiple upgrades.