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distribution to the pumps. Some of the bleed air is routed
through the restrictor (orifice) in the cross fitting, through a
balance line to the other restrictor (orifice) and cross fitting, and
then to the other reservoir until the air pressure in both
reservoirs is equalized. The bleed air in the balance line is also
routed to the air charging manifold assembly and air pressure
gauge.
In the event the reservoir pressure increase to 60-65 psi, the
pressure relief valve will open to vent the excess air pressure
out through APU fuel line shroud drain mast.
The reservoirs will remain pressurized after the pneumatic
system has been depressurized.
Pressurization (air charging valve)
The air charging valve can be used to connect an external air
source for pressurizing the hydraulic systems A and B
reservoirs when the pneumatic system crossover manifold is
not pressurized.
The dust cap on the air charging valve is removed, the external
air source is connected to the valve stem and the swivel nut
turned (2-1/4 turns) to open the air charging valve. External air
is then supplied to pressurize the reservoirs to 45-50 psi. The
swivel nut is then turned in the opposite direction (2-1/4 turns) to
close the air charging valve. The reservoirs will remain
pressurized until the air charging valve is opened.
Depressurization
The reservoirs are depressurized by opening the air charging
valve on the manifold assembly.
To depressurize the hydraulic systems A and B reservoirs, you
must first shutdown all pneumatic sources (engines, APU, or
external air) before opening the air charging valve.
HYDRAULIC RESERVOIR PRESSURIZATION SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 101-115; GUN 201-999 POST SB 737-29-1106 29-09-00
Page 10
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-09-00-004
Hydraulic Reservoir Pressurization System - General Description
HYDRAULIC RESERVOIR PRESSURIZATION SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 101-115; GUN 201-999 POST SB 737-29-1106 29-09-00
Page 11
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-09-00-004
General
The hydraulic reservoir pressurization system supplies
pressurized filtered bleed air from the airplane’s pneumatic
system (left/right engine bleed air, APU bleed air, or external
ground air) to the main hydraulic systems A and B reservoirs.
The reservoirs can also be manually pressurized using an
external ground air source (via connection to air charging
valve) without the need of pressurizing the pneumatic system
crossover manifold.
The system provides a positive supply of hydraulic fluid to the
pumps, maintains normal return pressure in the hydraulic
system, and also helps to prevent foaming in the reservoirs. A
constant pressure of approximately 45-50 psi is normally
supplied to the reservoirs by the pneumatic system.
Overpressurization protection for the reservoirs is provided
by pressure relief valves which are set to relieve between 60-65
psi.
Components
These are the components of the hydraulic reservoir
pressurization system:
* Reservoir pressurization module
* Orifice assembly
* Reservoir depressurization valve (2)
* Air pressure indicator (2)
* Pressure relief valve (2)
* Restrictor (5)
* Vent (4).
Component Locations
The components of the reservoir pressurization system are in
the right main landing gear wheel well between the main
hydraulic systems A and B reservoirs adjacent to the forward
bulkhead (rear spar).
HYDRAULIC RESERVOIR PRESSURIZATION SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
GUN 201-999 PRE SB 737-29-1106 29-09-00
Page 12
D633A101-GUN Feb 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-09-00-101
HYDRAULIC RESERVOIR PRESSURIZATION SYSTEM - GENERAL DESCRIPTION
HYDRAULIC RESERVOIR PRESSURIZATION SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
GUN 201-999 PRE SB 737-29-1106 29-09-00
Page 13
D633A101-GUN Feb 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-09-00-101
General
The reservoir pressurization system supplies pneumatic
pressure to system A, system B, and the standby system
reservoirs when the reservoir pressurization module is
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