ELEVATORS ELEVATORSELEVATORRUDDER ANDAILERONS AILERONSAUTOPILOT FEEL YAW DAMPER AUTOPILOT GROUND
SPOILERS
LANDING
GEAR
BRAKES 1 CHECK VALVE LOCATIONS ARE DIFFERENT FOR DIFFERENT AIRPLANE CONFIGURATIONS (AMM 29-22-00/001)
Simplified Hydraulic System Schematic
Figure 2
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F42828
A
737-300/400/500
MAINTENANCE MANUAL
SEE A 1
MOUNTING PAD
CLAMP QAD
PUMP DEPRESSURIZATION VALVE CASE DRAIN LINE
ELECTRICAL CONNECTOR
PRESSURE LINE
SUPPLY LINE FWD
VICKERS EDP
1 NO. 1 ENGINE SHOWN NO. 2 ENGINE SIMILAR A
Engine-Driven Pump (EDP) Figure 3
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A 737-300/400/500MAINTENANCE MANUAL
4. Standby Electric Motor-Driven Pump (EMDP) (Fig. 7 and 8)
_________________________________________
A. The motor/pump assembly is mounted behind the standby reservoir on the keel beam.
B. The standby EMDP supplies a maximum of 3 gpm regulated to a nominal 3000 psi. The pump is a variable delivery, positive displacement pump driven by a 3-phase, 115-volt motor and controlled by 28 volt dc relays (Fig. 8).
C. A compensator within the pump reacts to discharge pressures and varies the ratio of fluid delivered to the system to fluid recirculated within the pump. Case drain fluid for cooling and lubrication is discharged to the return line through piston bypass holes.
5. Hydraulic Reservoir (Fig. 9)
___________________
A. The hydraulic reservoir for each system supplies hydraulic fluid for the flow demands of the user systems. The reservoirs for systems A and B are in the center and right main wheel wells, respectively. The standby system reservoir is mounted on the keel beam between the wheel wells and is attached by a balance line to the system B reservoir. The balance line permits filling and pressurizing the standby and system B reservoirs.
YOKE ASSEMBLY
INPUT SHAFT
NO. 1 ENG PUMP
DEPRESS VALVE
28V DC BUS NO. 2
ENG 1
P6
NO. 1 EDP SHOWN NO. 2 SIMILAR
Engine Driven Pump (EDP) Control
1 Figure 4
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A
737-300/400/500MAINTENANCE MANUAL
SYSTEM A EMDP SEE A
FWD
SYSTEM B EMDP
SEE A
KEEL BEAM
(REF)
WHEEL WELL
ELECTRICAL
CONNECTOR
ABEX EMDP
GROUNDING STRAP CASE DRAIN LINE
(TYPICAL) PRESSURE LINEACOUSTIC FILTER
SUPPLY LINE 1
SYSTEM B EMDP SHOWN
A1
SYSTEM A EMDP SIMILAR
Hydraulic Systems A and B Electric Motor-Driven Pump (EMDP) Figure 5
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A 737-300/400/500MAINTENANCE MANUAL
(SYSTEM B EQUIVALENT)
Hydraulic Systems A and B Electric Motor-Driven Pump (EMDP) Control
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