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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