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 B.  Each system contains a reservoir, pump(s), pressure module, and appropriate filters. Systems A and B also have heat exchangers to cool system fluid.
Engine Driven Pump (EDP) (Fig. 3 and 4)
________________________
 A.  The engine driven pumps (EDP) are one of the two pressure sources for each of the A and B hydraulic systems. An EDP supplies about 22 gpm at 3000 psi through a variable displacement pump mounted on the lower left side of the engine. The EDP is driven through a splined shaft by the engine accessory drive gearbox. A barrel cylinder containing nine pistons is revolved adjacent to a cam plate (and yoke) holding the piston shoes in a cam track. As the pistons reciprocate travelling in the cam track, they are forced to discharge fluid at working pressure. This pressure is sensed by a compensator piston calibrated to drive the yoke (cam plate) to a ramp angle which will maintain a supply of approximately 22 gpm at 3000 psi. The pump also moves fluid through its case to lubricate and cool the pump. A case drain port directs this fluid to a heat exchanger in the fuel tank before returning to the reservoir.
 B.  The output of the EDP can be shut off by a depressurization valve on the pump (Fig. 4). This valve closes the pump outlet port when the engine pump switch on the hydraulic control panel is moved to OFF.
 C.  The supply line to the EDP is shut off by the EDP supply shut off valve
 when the engine fire switch is pulled to the FIRE position.Electric Motor-Driven Pump (EMDP) (Fig. 5 and 6)
_________________________________
 A.  Systems A and B each have one EMDP. An EMDP supplies 6.0 gpm at 2700 psi to each A and B hydraulic system. Each pump assembly is composed of an oil-cooled three phase 115 volt ac motor, a centrifugal pump and a single stage, variable displacement, pressure-compensated hydraulic pump. The pump assemblies are attached on vibration absorbing mounts and are located in left and right forward wheel well area. They are controlled by switches on the P5 panel. The hydraulic fluid enters the pump by way of the electric motor housing providing cooling to the rotor and stator assemblies, before entering the centrifugal boost cavity. From the centrifugal boost pump, the fluid is driven into a pump already described as very similar to the EDP. See the EDP pump description above to include case drain fluid flow.
 B.  An acoustic filter is fitted in the pressure line of each EMDP to suppress the noise and vibration of pump operation.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

SYSTEM A PRESSURE MODULE
SYSTEM A RETURN FILTER MODULE
STANDBY SYSTEM
RESERVOIR

STANDBY
PRESSURE
MODULE

STANDBY EMDP CASE DRAIN FILTER
STANDBY SYSTEM EMDP ENGINE DRIVEN PUMP (EDP) (TYPICAL)
SYSTEM A RESERVOIR
SYSTEM A EMDP
SYSTEM B EMDP
RESERVOIR PRESSURIZATION MODULE
SYSTEM B PRESSURE MODULE
SYSTEM B RESERVOIR
MANUAL FILL PUMP
PRESSURE FILL CONNECTION
RESERVOIR FILL PRESSURE FILTER
SYSTEM B RETURN FILTER MODULE
PTU PRESSURE FILTER
POWER TRANSFER UNIT (PTU)
WHEEL WELL
Hydraulic Systems A, B, and Standby Components Figure 1
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
SYSTEM B RETURN
RDV
RDV
FILTER MODULE
FROM LEFT
FROM RIGHT
B
PNEUMATIC
PNEUMATIC
SYSTEM B
DUCT  DUCT
RESERVOIR
STANDBY
SYSTEM A RETURN
RESERVOIR
RETURNFLOW STANDBY SYSTEM
FILTER MODULE
SYSTEM A
PRESSURE MODULE
FUEL
RESERVOIR
SYSTEM B
B
RETURNRESERVOIR FILLHEAT
FLOW FUEL EXCHANGER
FLEX HOSE WITHSELECTOR VALVE NOZZLE EMDP EDP HEAT
PRESSURESYSTEM A
EXCHANGER
FILL PORTRETURNEMDP HAND OPERATE
1
FLOW PUMP POWERTRANSFER
UNIT
EMDP EDP STANDBYLEADING EDGERUDDER DEVICES SYSTEM B PRESSUREMODULE LEFT THRUSTRIGHT THRUSTTRAILING
　
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