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 operated shutoff valves and a replaceable filter.Case Drain Filters (Fig. 12)
__________________
 A.  Each EDP and EMDP deliver case drain fluid to separate throw-away filters placed in the line leading from the pump. The EDP case drain filters are in their respective left and right wing trailing edges, just forward of the number 4 and 5 spoilers. The systems A and B EMDP case drain filters are mounted directly beneath their respective EMDP on the left and right wheel well forward wall. The standby EMDP case drain filter is on the forward wall of the aft wheel well bulkhead. A thermal switch is installed in each system A and B EMDP case drain line enroute to the filter. The included overheat light is on the P5 panel. A check valve is located at each case drain filter outflow.
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A

737-300/400/500
MAINTENANCE MANUAL

SYSTEM A 
RESERVOIR 
SEE  A 
FORWARD 
BULKHEAD (REF) 
SYSTEM B 
RESERVOIR 
SEE  B 
STANDBY 
RESERVOIR 
SEE  C 

FWD
KEEL BEAM (REF)
VENT LINE
RESERVOIR PRESSURE RELIEF VALVE
FROM RESERVOIR PRESSURIZATION MODULE
QUANTITY INDICATOR/ TRANSMITTER
RETURN AND
FILL LINE
DRAIN/SAMPLING VALVE EDP SUPPLY LINE EMDP SUPPLY LINE
SYSTEM A RESERVOIR
A

Hydraulic Systems A, B, and Standby Reservoirs
Figure 9 (Sheet 1)

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A

737-300/400/500MAINTENANCE MANUAL 
VENT  RESERVOIR PRESSURE 
LINE  RELIEF VALVE 

FROM RESERVOIR
PRESSURIZATION
MODULE

QUANTITY
INDICATOR/
TRANSMITTER

FILL LINE
RETURN LINE
DRAIN/SAMPLING VALVE
EMDP SUPPLY LINE EDP SUPPLY LINE
POWER TRANSFER UNIT SUPPLY LINE
SYSTEM B RESERVOIR B
BALANCE LINE
TO SYSTEM B
RESERVOIR

LOW QUANTITY SWITCH
FROM FLUID FILLING STATION
RETURN LINE
STANDBY EMDP SUPPLY LINE
STANDBY RESERVOIR C
Hydraulic Systems A, B, and Standby Reservoirs Figure 9 (Sheet 2)
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A

737-300/400/500
MAINTENANCE MANUAL

SEE  A 
SYSTEM A 
RETURN FILTER MODULE 
SEE  B 
SYSTEM A 
RESERVOIR (REF) 
SYSTEM B 
RESERVOIR (REF) 

SYSTEM B RETURN FILTER MODULE
SEE C
FWD
A
Hydraulic Systems A and B Return Filter Module Figure 10 (Sheet 1)
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A 737-300/400/500MAINTENANCE MANUAL

PORT 2 FROM HEAT EXCHANGER
FILTER MODULE
PORT 3

FILTER MODULE
SYSTEM A FILTER MODULE SYSTEM B FILTER MODULE

C

Hydraulic Systems A and B Return Filter Module
Figure 10 (Sheet 2)

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