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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
These components of the reservoir pressurization system are
located in the main landing gear wheel well (right side) at the
forward bulkhead between the main hydraulic systems A and B
reservoirs:
* Cross fitting, check valve, and restrictor (orifice)
* Pressure relief valve
* Balance line
* Air charging valve and manifold assembly
* Air pressure gauge
Cross Fitting, Check Valve, and Restrictor (Orifice)
A cross fitting is installed between each hydraulic systems A
and B reservoirs and the pressure relief valves. A check valve
and a restrictor (orifice) are attached to each cross fitting to
isolate the left and right engine bleed systems and to prevent
loss of pneumatic pressure if either engine bleed fails. The
check valve is connected to the bleed air supply line. The
restrictor (orifice) is connected to the balance line between each
cross fitting.
Pressure Relief Valve
A pressure relief valve is installed between the hydraulic
systems A and B reservoirs and connect to each cross fitting.
The pressure relief valve opens when the air pressure in the
reservoir increases to 60-65 psi to protect the reservoir from
overpressurization. Maximum flow thru the relief valve is
approximately 20 gpm.
The excess air pressure from the reservoirs is vented thru the
pressure relief valve and out through the APU fuel line shroud
drain mast.
The pressure relief valve closes (reseats) when the reservoir
overpressurization condition has been relieved which is
approximately 90% of the relieving pressure (minimum 55 psi
reseat pressure).
Air Charging Valve and Manifold Assembly
The air charging valve and manifold assembly are installed
below the cross fittings and the balance line. The air charging
valve permits manual depressurization of the hydraulic
systems A and B reservoirs for ground maintenance. The air
pressure in both hydraulic system A and B reservoirs is
released (depressurized) when the air charging valve is
opened.
HYDRAULIC RESERVOIR PRESSURIZATION SYSTEM - COMPONENT LOCATION - MLG WHEEL WELL
EFFECTIVITY
GUN 001-099, 101-115; GUN 201-999 POST SB 737-29-1106 29-09-00
Page 7
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-09-00-003
The air charging valve can also be connected to an external air
source to permit manual pressurization of both hydraulic
systems A and B reservoirs for ground maintenance without
need of pressurizing the pneumatic system crossover manifold.
The air charging valve is opened/closed by turning the swivel
nut clockwise/counterclockwise. A dust cap is installed on the
valve stem of the air charging valve.
Air Pressure Gauge
An air pressure gauge is connected to the air charging valve
and manifold assembly to show the air pressure in the hydraulic
systems A and B reservoirs. The pressure gauge is calibrated
in pounds per square inch (psi).
HYDRAULIC RESERVOIR PRESSURIZATION SYSTEM - COMPONENT LOCATION - MLG WHEEL WELL
EFFECTIVITY
GUN 001-099, 101-115; GUN 201-999 POST SB 737-29-1106 29-09-00
Page 8
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-09-00-003
HYDRAULIC RESERVOIR PRESSURIZATION SYSTEM - COMPONENT LOCATION - MLG WHEEL WELL
HYDRAULIC RESERVOIR PRESSURIZATION SYSTEM - COMPONENT LOCATION - MLG WHEEL WELL
EFFECTIVITY
GUN 001-099, 101-115; GUN 201-999 POST SB 737-29-1106 29-09-00
Page 9
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-09-00-003
General
Under normal operations the pneumatic system pressurizes the
hydraulic systems A and B reservoirs to 45-50 psi. This
pressurizes the supply fluid flow from the reservoirs to the
pumps and pressurizes the return fluid in the hydraulic system.
The reservoirs can also be pressurized by connection of an
external air source to the air charging valve without the need of
pressurizing the pneumatic system crossover manifold.
Pressurization (crossover manifold)
The bleed air from the pneumatic system crossover manifold
duct is first routed through an air filter assembly that consists of
a filter element and a check valve, and then through a check
valve in the cross fitting assembly.
The majority of the bleed air is then routed to the system
reservoir to pressurize the supply fluid in the reservoir for
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