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37.5 gpm and 2850 psi at 3750 rpm. Maximum discharge
pressure is rated at 2950 psi to 3075 psi at 0 flow.
A depressurization solenoid valve in the pump controls the EDP
output pressure when you move the ENG HYD PUMP switch on
the hydraulic panel to the OFF position. This completes a 28v dc
electrical circuit and energizes the valve to the closed position.
When the depressurization solenoid valve is open, EDP output
pressure goes to these valves:
* The blocking valve closes and blocks output pressure
downstream from the depressurization solenoid valve.
* The compensator valve opens and allows output pressure
upstream from the depressurization solenoid valve to go to
an actuating piston. This controls a yoke assembly. When the
actuating piston moves, the yoke assembly moves to a 0
displacement position. This stops output pressure to the
hydraulic system downstream.
When the pump operates in the normal or depressurized
modes, case drain fluid is used for lubrication and cooling. The
case drain fluid circulates through the pump and back to the
EDP case drain filter and heat exchanger before it goes to the
related reservoir.
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General
The EDP operates when the related engine turns.
To stop output flow from the EDP, move the ENG 1 HYD PUMP
or ENG 2 HYD PUMP switch on the hydraulic panel to the OFF
position. This does not stop the rotation of the pump or the
internal pressure in the pump.
EDP HYD PUMP Switch Operation
When the ENG 1 HYD PUMP or ENG 2 HYD PUMP switch is in
the ON position, the depressurization solenoid valve is not
energized. This lets the pressure output of the EDP go to the
hydraulic system.
When the ENG 1 HYD PUMP or ENG 2 HYD PUMP switch is in
the OFF position, power from 28v dc bus 2 (for hydraulic system
A EDP) or 28v dc bus 1 (for hydraulic system B EDP) energizes
the EDP depressurization solenoid valve. This closes the valve
to stop the pump output.
The case drain flow continues inside the pump when the
depressurization solenoid valve is in the closed position.
EDP Supply Shutoff Valve Operation
When you pull the engine fire switch, the EDP supply shutoff
valve moves to the closed position. This stops the supply of
hydraulic fluid to the EDP. There is no case drain flow in this
condition.
When you operate one of the engine fire switches, the pump
LOW PRESSURE amber light is disarmed.
The EDP supply shutoff valve moves to the open position when
you move the engine fire switch to the stowed position.
Training Information Point
The ENG 1 HYD PUMP and ENG 2 HYD PUMP switches should
stay in the ON position, even when you remove airplane power,
except when you need to remove pressure from the pump. This
extends the service life of the depressurization solenoid valve.
Loss of electrical power to the control circuit does not affect the
output of the pumps.
CAUTION: DO NOT TURN THE FIRE HANDLE. IF YOU TURN
THE FIRE HANDLE, THE FIRE BOTTLE WILL
RELEASE ITS CONTENTS.
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MAIN HYDRAULIC SYSTEMS - ENGINE-DRIVEN PUMP - FUNCTIONAL DESCRIPTION - ELECTRICAL
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