in the performance and operation of these systems.Look at some of the components that have changed inthe OD box and the pitch indicating system.OIL DISTRIBUTION BOX.— On DD-51 classships, the configuration of the OD box has undergoneseveral changes.The emergency pitch pump hoseconnections have been moved from the bottom of theOD box to the low-pressure chamber cover, as shown inPITCH INDICATING SYSTEM.— A significantchange was made to the pitch indicating system. Thereare now two types of pitch indicating systems installedon DDG-51 class ships. One system is temperaturecompensated while the other is electronic. Becausethese two systems operate independently, DDG-51 classships have both a normal and alternate means ofmeasuring propeller pitch.figure 3-9. This change makes it easier for the operatorTemperature-Compensated Pitch Indicatorto make the connections during testing or in case of anSystem. — O n D D G - 5 1 c l a s s s h i p s , t h eemergency.temperature-compensated pitch scale platform is rigidlyFigure 3-9.—Emergency pitch arrangement.3-13
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