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MAIN HYDRAULIC SYSTEMS -HYDRAULIC SYSTEM RESERVOIRS
Training Information Point
You get access to the left and right reservoirs through the aft strut fairing doors on both sides of the aft engine struts.
When filled to the correct level, the top sight glass shows red and the bottom sight glass shows black.
When the reservoir is in an overfull condition, both sight glasses show black.
When the reservoir needs to be filled, both sight glasses show red.
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MAIN HYDRAULIC SYSTEMS -HYDRAULIC SYSTEM RESERVOIRS
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MAIN HYDRAULIC SYSTEMS -RESERVOIR PRESSURIZATION MODULE AND SHUTOFF VALVE
General
The reservoir pressurization modules supply airplane bleed air to the reservoirs.
The reservoir pressurization shutoff valves are manually operated valves which permit the shutoff of air pressure to the reservoir.
Each hydraulic system has a reservoir pressurization module, and a reservoir pressurization shutoff valve.
Physical Description
Each reservoir pressurization module has these components:
*
Filter (2)
*
Check valve (2)
*
Test port
*
Manual bleed valve
*
Gage port.
The reservoir pressurization shutoff valves are simple manual shutoff valves. These shutoff valves are before the pressurization module in the pneumatic line to the reservoir.
Location
The modules for the left and right systems are in the engine aft struts below their reservoir.
The center system module is on the aft bulkhead in the right wheel well.
The shutoff valves are near the pressurization modules.
Operation
To depressurize a reservoir, first turn the shutoff valve to the closed position. Install the lock pin to hold the valve in the closed position.
You depressurize the reservoir with the manual bleed valve on the reservoir pressurization module.
CAUTION: PUT A RAG AROUND THE AIR BLEED VALVE ON THE RESERVOIR PRESSURIZATION MODULE TO CATCH HYDRAULIC FLUID SPRAY. HYDRAULIC FLUID SPRAY CAN CAUSE INJURIES TO PERSONS.
Training Information Point
A reservoir pressure switch near each of the reservoirs send reservoir pressure low or reservoir pressure not-low signals to the HYDIM cards.
See the hydraulic indicating section for more information about the reservoir sensors (SECTION 29-30).
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MAIN HYDRAULIC SYSTEMS -RESERVOIR PRESSURIZATION MODULE AND SHUTOFF VALVE
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MAIN HYDRAULIC SYSTEMS -ENGINE DRIVEN PUMP
Purpose
The engine driven pump (EDP) is the primary pump for the left and right hydraulic systems.
Physical Description
The EDP is an axial-piston, variable displacement, hydraulic
pump assembly.
An internal pressure compensator controls the output pressure
of the pump to approximately 3000 psi.
A depressurization solenoid valve blocks the pump output flow
when you turn off the pump.
Case drain hydraulic flow cools and lubricates the engine
driven pump.
A ripple damper smooths the pump pressure output. The pump is rated at 48 gpm at 2850 psi and 3900 rpm. The dry weight of the pump is 36 pounds (16 kg).
Location
The EDP is on the aft face of the engine main gearbox on the right side of each engine.
Functional Description
The engine main gearbox turns the EDP when the engine turns. When the depressurization solenoid valve is not energized, pump pressure output goes to the hydraulic system.
When you turn off the pump, the depressurization solenoid valve gets electrical power. This permits pressurized hydraulic fluid from the pump output line to move the blocking valve. This causes a blockage and removes the pressure from the EDP.
Training Information Point
You get access to the EDPs through the right thrust reverser half.
CAUTION: MAKE SURE YOU INSTALL THE O-RING IN THE SPLINE GROOVE ON THE DRIVE SHAFT OF THE ENGINE DRIVEN PUMP. THE O-RING PREVENTS LEAKAGE OF OIL FROM THE ENGINE GEARBOX.
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MAIN HYDRAULIC SYSTEMS -ENGINE DRIVEN PUMP
