ARMY TM 9-6115-464-12AIR FORCE TO 35C2-3-445-1NAVY NAVFAC P-8-624-121-20 HYDRAULICSYSTEM.The hydraulic system (Figure 1–12) is used on the electro-hydraulic governorequipped precise generator sets. Its function is to provide precise frequency control, The system consists of a sump,a replaceable element type filter, a gear driven positive displacement type pump, a pressure relief valve, a hydraulicactuator and interconnecting lines. The hydraulic fluid is pumped from the sump through the hydraulic pump to thefilter. The pressurized filtered fluid is routed through the hydraulic actuator and back to the sump. The actuator hy-draulically operates the governor control linkage to change the governor setting. Changing the governor settingincreases or decreases the engine speed causing a corresponding increase or decrease in generator output fre-quency.Figure 1-12. Hydraulic System Diagram(Electo-Hydraulic Governor Equipped Precise Sets Only1-21 ELECTRONICGOVERNINGSYSTEM.The electronic governing system senses speed and load electrical-ly and provides the controls and load responses for effective single unit or parallel operation. The system consistsof a rheostat for frequency adjustment, a load measuring unit for sensing load changes and a governor control unitwhich signals the actuator for rapid governor response.1-22
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