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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-00-00-006
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D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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:
* Air filter assembly (2)
* Secondary check valve (2)
* Cross fitting assembly (2)
* Check valve (2)
* Restrictor/orifice (2)
* Pressure relief valve (2)
* Air charging valve (1)
* Manifold assembly (1)
* Air pressure gauge (1)
* Plug (3)
* Air supply line (2)
* Reservoir balance line (1)
* Reservoir overpressurization vent line (1)
Component Locations
The air filter assemblies of the reservoir pressurization system
are in the left and right enviromental control system (ECS) pack
bays adjacent to the pneumatic system crossover manifold
duct.
The other 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 001-099, 101-115; GUN 201-999 POST SB 737-29-1106 29-09-00
Page 2
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-09-00-001
HYDRAULIC RESERVOIR PRESSURIZATION SYSTEM - GENERAL DESCRIPTION
HYDRAULIC RESERVOIR PRESSURIZATION SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 101-115; GUN 201-999 POST SB 737-29-1106 29-09-00
Page 3
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-09-00-001
General
An inline air filter assembly is installed in the left and right
Enviromental Control System (ECS) pack bays adjacent to the
pneumatic system’s crossover manifold duct.
The air filter assembly removes foreign material from the bleed
air to prevent blockage and downstream contamination of the
reservoir pressurization system components and hydraulic
systems A and B reservoirs.
Air Filter Assembly
The air filter assembly consists of a wire-wound metal filter
element, a filter case, a filter head (housing), packings (o-rings),
a reducer in the inlet port, and a check valve in the outlet port.
The check valve is supplied as a part of the filter assembly, but
it can be removed and replaced as a separate unit.
The metal filter element is cleanable via ultrasonic methods.
HYDRAULIC RESERVOIR PRESSURIZATION SYSTEM - COMPONENT LOCATION - ECS PACK BAYS
EFFECTIVITY
GUN 001-099, 101-115; GUN 201-999 POST SB 737-29-1106 29-09-00
Page 4
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-09-00-002
HYDRAULIC RESERVOIR PRESSURIZATION SYSTEM - COMPONENT LOCATION - ECS PACK BAYS
HYDRAULIC RESERVOIR PRESSURIZATION SYSTEM - COMPONENT LOCATION - ECS PACK BAYS
EFFECTIVITY
GUN 001-099, 101-115; GUN 201-999 POST SB 737-29-1106 29-09-00
Page 5
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-09-00-002
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HYDRAULIC RESERVOIR PRESSURIZATION SYSTEM - COMPONENT LOCATION - ECS PACK BAYS
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D633A101-GUN Feb 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
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