| Engine Driven Hydraulic Pump An engine-driven hydraulic pump supplies approximately 4 times the fluid
volume of the related electric motor-driven hydraulic pump.
The ENG 1 (System A) Pump or ENG 2 (System B) pump is powered by the No. 2 engine. ON /OFF Switch controls the engine-driven pump output pressure. Positioning the switch to OFF isolates fluid flow from the system components. However, the engine-driven pump continues to rotate as long as the engine is operating. Pulling the Fire Handle shuts off the fluid flow to the engine-driven pump and deactivates the related LOW PRESSURE Light. Hydraulic fluid used for cooling and lubrication of the pumps passes through a heat exchanger before retuming to the reservoir. The heat exchanger for System A is located in Main Fuel Tank No. 1 and for System B is in Main Fuel Tank No. 2.CAUTION Minimum fuel for ground operation of electric motor-driven pumps is 1675 Lbs in the related main tank.
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