Woodward UG-10 Dial, Installation And Operation Manual, Page: 32 / 62

UG Dial Governor Manual 03040
26 Woodward
Chapter 5.
Troubleshooting
Introduction
This chapter provides instructions for troubleshooting.
It is impossible to anticipate every kind of problem that is encountered in the field.
This manual covers the most common problems experienced. Poor governing
may be due to faulty governor performance, or it may be due to the governor
attempting to correct for faulty operation of the prime mover or the equipment
driven. The effect of any auxiliary equipment on the overall control required of the
governor must also be considered.
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.
Troubleshooting
Oil
Keep the governor oil level to-the mark on the oil sight glass with the unit
operating. The correct oil level is 19 to 32 mm (0.75 to 1.25 inch) below the top of
the governor case.
Dirty oil causes most governor problems. Use clean new or filtered oil. Oil
containers used must be perfectly clean. Oil contaminated with water breaks
down rapidly, causing foaming, and corrodes internal governor parts.
Compensating Adjustment and Needle Valve
The compensating adjustment and needle valve must be correctly adjusted with
the governor controlling the engine or turbine, even though the compensation
may have been previously adjusted at the factory or on governor test equipment.
Although the governor may appear to be operating satisfactorily because the unit
runs at constant speed without load, the governor still may not be correctly
adjusted to the load and to the engine it is to control.
High overspeeds and low underspeeds, or slow return to speed, after a load
change or speed setting change, are some of the results of an incorrect setting of
the compensating adjustment and needle valve.