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NOTE:  Leakage through check valve will cause a reading on pressure gage in No. 2 engine area.
K.  Decrease pressure to zero by opening shutoff valve. Reverse connections between No. 1 and 2 engine bleed lines and repeat step G thru J at No. 2 engine.
L.  Remove pressure source, pressure gages and shutoff valves. Close reservoir air bleed valve at air manifold by tightening release nut and reinstalling cap. Reconnect bleed air lines in No. 1 and 2 engine area.
M.  Check that inlet tube is connected to air pressure regulator.
N.  Close access panels.
O.  Check pressure relief valve.
(1)  
Connect regulated source of nitrogen or clean dry air to reservoir air bleed valve on manifold port 8.

(2)  
Disconnect and cap inlet tube from air pressure regulator and outlet tube to system A reservoir.

(3)  
Open release nut of bleed valve and slowly apply pressure. Check that relief valve opens at 60 to 65 psi. Do not exceed 70 psig.

(4)  
Close release nut of bleed valve and remove pressure source.

(5)  
Install bleed valve dust cap.

P.  On airplanes with sump tube and drain fitting, remove blanking cap from drain port and reinstall the sump drain cap.
NOTE:  The sump drain cap has a small hole drilled through it to act as a constant bleed valve. The purpose of this is to constantly eject water buildup during flight and so prevent freezing.
Q.  On airplanes with vented cap, check that hole in vented cap on lower side of air manifold is not blocked.
NOTE:  The vented cap has a small hole drilled through it to act as a constant bleed valve. The purpose of this is to constantly eject water buildup during flight and so prevent freezing.
504 
Jun 20/90  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  29-09-300 Page 503 

HYDRAULIC RESERVOIR PRESSURIZATION AIR MANIFOLD - REMOVAL/INSTALLATION
1.  General
A.  A container may be necessary to catch fluid from disconnected lines. Should any fluid spill on the airplane, decontaminate (Ref Chapter 12, Cleaning and Washing).
2.  Equipment and Materials
A.  Skydrol Assembly Lube - MCS 352 or Fire-Resistant Hydraulic Fluid, BMS\3-11
3.  Remove Hydraulic Reservoir Pressurization Air Manifold (Fig. 401)
A.  Depressurize hydraulic reservoirs (Ref 29-09-300 MP).
B.  Disconnect lines from manifold.
C.  Remove pressure relief valve and union from manifold.
D.  Remove engine bleed air check valves.
E.  Remove reservoir air bleed valve.
F.  Remove ground air charging (test) valve and cap retaining chain from manifold.
G.  Remove sump tube and drain fitting or vented cap from manifold.
H.  Remove remaining unions from manifold.
I.  Remove mounting bolts securing manifold to airplane structure.
4.  Install Hydraulic Reservoir Pressurization Air Manifold (Fig. 401)
A.  Place manifold in mounting position and install mounting bolts.
B.  Install unions in manifold, using new O-rings. Lubricate with assembly lube or hydraulic fluid.
C.  Install ground air charging (test) valve in port 3 and attach cap and retaining chain.
D.  Install reservoir air bleed valve in port 8.
E.  Install sump tube and drain fitting or vented cap in port 9.
F.  Install engine bleed air check valves in ports 1 and 2.
G.  Install pressure relief valve and union in port 4 with flow arrow pointing away from manifold.
H.  Connect all lines to manifold.
I.  Pressurize hydraulic reservoir pressurization system and check manifold and connections for leaks (Ref 29-09-300 MP).
536 
Jun 20/93  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  29-09-311 Page 401 

F86919
Hydraulic Reservoir Pressurization Air Manifold Installation  536 
29-09-311  Figure 401  Jun 20/93 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

HYDRAULIC RESERVOIR PRESSURIZATION AIR PRESSURE FILTER - UNIT SERVICING
1.  Equipment and Materials
A.  Skydrol Assembly Lube - MCS 352 or Fire-Resistant Hydraulic Fluid, BMS\3-11
2.  Clean Air Pressure Filter
A.  Depressurize hydraulic reservoir system (Ref 29-09-300 MP).
B.  Unscrew filter case and remove case with filter element (Fig. 301).
C.  Clean filter case and element.
NOTE: The most effective means of cleaning metallic filter elements is the ultrasonic method.
D.  Lubricate O-rings and threads of filter bowl with assembly lube or hydraulic fluid.
　
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