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A 737-300/400/500MAINTENANCE MANUAL
FROM APU

Hydraulic Reservoir Pressurization System Schematic
Figure 1

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F07566
A

737-300/400/500
MAINTENANCE MANUAL

RESERVOIR PRESSURIZATION MODULE
SEE A
TUBING ASSEMBLY
(2 LOCATIONS)

SEE C
MOUNTING BOLTS, RESERVOIR PRESSURIZATION MODULE (2 LOCATIONS)
MANUAL AIR CHARGING VALVE
DEPRESSURIZATION 
VALVE FOR THE 
DEPRESSURIZATION  SYSTEM A RESERVOIR 
VALVE FOR THE SYSTEM B  SUPPORT VALVE  SEE  B 
RESERVOIR 
TO RESERVOIRS 
SEE  B 

BULKHEAD WHEELWELL FORWARD 
MODULE PRESSURIZATION RESERVOIR  SUPPLY LINES PNEUMATIC  INBD  FWD 
RESERVOIR PRESSURIZATION MODULE 
A 

DEPRESSURIZATION (VENT) VALVE
(2 LOCATIONS)

B

Reservoir Pressurization Module
Figure 2 (Sheet 1)

B82207
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A

737-300/400/500
MAINTENANCE MANUAL

INBD
TUBING ASSEMBLY

THE CHECK VALVE IS INSTALLED IN THE TEE VALVE ASSEMBLY
Reservoir Pressurization Module Figure 2 (Sheet 2)
F07048
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A 737-300/400/500MAINTENANCE MANUAL
 5.  Depressurization Valve
______________________
 A.  A manually controlled depressurization (vent) valve for each A and B system is located between the reservoir and the reservoir pressurization module. A valve lock can be installed over a maintenance period, requiring removal to return the system to operational (pressurized) status. The standby reservoir pressure is transmitted through the balance line from the system B reservoir.
 6.  Pressure Gage
_____________
 A.  A pressure gage calibrated in pounds per square inch is located to be easily seen between each depressurization (vent) valve and reservoir. The gage supports ground maintenance activities.
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A
737-300/400/500MAINTENANCE MANUAL
 HYDRAULIC RESERVOIR PRESSURIZATION SYSTEM - MAINTENANCE PRACTICES
_________________________________________________________________
 1.  General
_______
 A.  This procedure tells you how to pressurize the hydraulic reservoirs with an external air source. It also tells you how to remove pressure from the hydraulic reservoirs.
 B.  The pressurization system for the hydraulic reservoirs supplies pressure to all hydraulic system reservoirs when the pneumatic manifold is pressurized. Bleed air from one or two engines and the APU pressurizes the pneumatic manifold. External air supplied through the ground service connector can also pressurize the pneumatic manifold.
 C.  You pressurize and release the pressure from the system B and standby reservoirs together. A balance line between the two reservoirs permits this. You can pressurize or release the pressure from the system A reservoir independently.
　
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