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A 737-300/400/500MAINTENANCE MANUAL
9. EDP Supply Shutoff Valve (Fig. 13)
________________________
A. The supply shutoff valve controls fluid supply to the EDP and is normally in the open position. The valve is operated by a 28 volt dc motor which is controlled by the engine fire switch. A position indicator on the valve provides a valve CLOSED or OPEN indication. The valve is installed in the EDP supply line in the fairing area on the aft side of the wheel well forward bulkhead.
10. Heat Exchanger (Fig. 14)
______________
A. Separate heat exchangers for systems A and B cool pump case drain fluid as the fluid returns to the reservoir. The two heat exchangers are composed of coils of finned aluminum tubing located in the wing fuel tanks using fuel as a coolant. The system heat exchangers are at the inboard end of the left and right main fuel tanks, respectively. The standby system is not fitted with a heat exchanger. A minimum of 250 gallons (1675 pounds/761 kilograms) of fuel is required in each main tank to provide hydraulic fluid cooling.
11. Ground Service Disconnect (Fig. 15)
_________________________
A. Hydraulic systems A and B can each be pressurized from a hydraulic test bench connected to the ground service disconnects. Systems A and B disconnects are located on the aft wall of the respective left and right air conditioning bays, forward of the wheel well forward bulkhead. At each location are quick-disconnects for pressure and return lines, and a filter containing a replaceable element. Each connector is fitted with a dust cover and retaining chain.
Hydraulic Systems A, B, and Standby Case Drain Filters
Figure 12 (Sheet 3)
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A
737-300/400/500
MAINTENANCE MANUAL
SEE A
HYD SOV ENG N0. 1 NORMAL FIRE SWITCH NO. 1 ENGINE OPEN
28V DC BAT. BUS FIRE
P8 CLOSE
FLUID SHUTOFF VALVE NO. 1 ENGINE HYDRAULIC
HYD SOV ENG NO. 2 NORMAL FIRE SWITCH NO. 2 ENGINE OPEN
SHUTOFF VALVE (TYPICAL) EDP SUPPLY 28V DC BAT. BUS P8 FIRE CLOSE
A FLUID SHUTOFF VALVE NO. 2 ENGINE HYDRAULIC
A B NORMAL OVHT DET ENG 1 OVERHEAT DISCH L R WELL FAULT APU DET INOP WHEEL BELL CUTOUT DISCH OVHT DET A B NORMAL ENG 2 OVERHEAT X T T E S T 1 L R DISCH L BOTTLE DISCHARGE ENGINES E R BOTTLE DISCHARGE 2 R
A U L T I N O P F TEST O V H T F I R E APU BOTTLE DISCHARGE FIRE SWITCHES (FUEL SHUTOFF) PULL WHEN ILLUMINATED LOCK OVERRIDE: PRESS BUTTON UNDER HANDLE L APU
P8
EDP Supply Shutoff Valve
Figure 13
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A
737-300/400/500MAINTENANCE MANUAL
SEE B
SEE A
SYSTEM A HEAT EXCHANGER
FUEL TANK FLOOR
A
Hydraulic Systems A and B Heat Exchanger
Figure 14 (Sheet 1)
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A
737-300/400/500MAINTENANCE MANUAL
12. Hydraulic Control Panels (Fig. 16)________________________
A. The control panels are on the P5 panel and contain the pump select switches and system warning lights.
B. The pump select switch for each EDP and EMDP is an ON/OFF toggle type and is accompanied by a pump low pressure light. Also mounted are EMDP case drain fluid overheat lights.
C. The P5 panel has warning lights for low pressure and low fluid quantity in the standby system.
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