Hydraulic System Block Diagram
Figure 1

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A

737-300/400/500
MAINTENANCE MANUAL

EDP 
(TYP) 
SYSTEM A 
RESERVOIR 
SYSTEM A EMDP 
SYSTEM B EMDP 
RESERVOIR 
PRESSURIZATION 
MODULE 
SYSTEM A  SYSTEM B 
PRESSURE MODULE  PRESSURE MODULE 
SYSTEM B 
RESERVOIR 
SYSTEM A 
RETURN FILTER 
MODULE 
STANDBY SYSTEM 
RESERVOIR 
STANDBY  MANUAL FILL 
PRESSURE  PUMP 
MODULE 
STANDBY EMDP  PRESSURE FILL 
CASE DRAIN  CONNECTION 
FILTER 
RESERVOIR FILL 
PRESSURE FILTER 
SYSTEM B RETURN 
FILTER MODULE 
STANDBY 
SYSTEM EMDP  PTU PRESSURE FILTER 
POWER TRANSFER UNIT (PTU) 

Hydraulic Power Components
Figure 2

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A 737-300/400/500MAINTENANCE MANUAL
FLT CONTROL STANDBY A B HYD
STDBY STDBY RUD

RUD OFF OFF

B ONA ON
ALTERNATE FLAPS

A HYD PUMPS B OFF
P5 PANEL
SYSTEMS A AND B PUMP
CONTROL AND FAULT INDICATION

OFF
ON

P5 PANEL RIGHT LIGHT SHIELD HYDRAULIC FAULT LIGHT STANDBY SYSTEM PUMP CONTROL AND FAULT INDICATION

FWD BULKHEAD WHEEL WELL (2 PLACES)
SYSTEMS A AND B
RESERVOIR PRESSURIZATION GAGE

Hydraulic Control and Annunciation Components
Figure 3 (Sheet 1)

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A 737-300/400/500MAINTENANCE MANUAL

SYSTEMS A AND B SYSTEMS A AND B FLUID QUANTITY INDICATION PRESSURE INDICATION
AIRPLANES WITHOUT ENGINE INSTRUMENT SYSTEM

SECONDARY DISPLAY PANEL SYSTEMS A AND B
PRESSURE AND FLUID QUANTITY INDICATION

AIRPLANES WITH ENGINE INSTRUMENT SYSTEM

Hydraulic Control and Annunciation Components
Figure 3 (Sheet 2)

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A 737-300/400/500MAINTENANCE MANUAL
 5.  Ground Servicing System (Fig. 2)
_______________________
 A.  A central ground servicing station is located in the right main gear wheel well on the lower outboard forward bulkhead. Hydraulic fluid is added to the reservoirs of all three systems from this station. A fill valve selects which reservoir(s) will receive fluid. Port A selects system A reservoir. Port B selects the standby and system B reservoirs. Quantity indicators at systems A and B reservoirs show fluid level. Fluid can be added under pressure from a ground service cart or with the manual fill pump installed at the servicing station.
 6.  Indicating Systems (Fig. 3)
__________________
 A.  The indicating system consists of warning lights and gages located in the wheel well and on cockpit panels. Fluid pressure, temperature (overheat) and reservoir quantity are monitored in the cockpit while reservoir quantity and pressure are indicated in the wheel well.
　
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