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 35-12-31
 ALL  ú ú 01 Page 402 ú Jun 25/85
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 024-007
 (6)  
Remove the attachment screws of the angle.

 S 024-008

 (7)  
Remove the angle.

 S 034-009

 (8)  
Disconnect inlet and outlet lines at the elbow swivel connections that are attached to the valve unions.

 NOTE: Residual pressure in the lines will cause oxygen to escape.
____
 S 024-010
 (9)
Remove the screws that attach the valve support to the structure.

 S 024-011

 (10)
 Remove the valve support and the oxygen system shutoff valve which are attached together.

 S 024-012

 (11)
 Remove the valve mounting screws.

 S 024-013

 (12)
 Remove the valve from the valve support.

 S 024-014

 (13)
 Remove the unions and the O-rings from the valve.

 S 434-015

 (14)
 To prevent contamination of the system components, seal the opened ports and lines with plugs or caps.

 TASK 35-12-31-404-016
 3.  System Shutoff Valve Installation (Fig. 401)_________________________________
 A. General
 (1)  Read the safety precautions and the general maintenance instructions of the oxygen system in 35-00-00/201, Oxygen.
 B. Consumable Materials
 (1) G00091 Compound - Oxygen System Leak Detection (MIL-L-25567)
 C. References
 (1)  35-00-00/201, Oxygen
 D. Access
 (1)  Location Zone
 102 Control Cabin, Right

 E. Procedure
 S 034-017
 (1)  Remove the caps and plugs from the ports and lines.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 35-12-31
 ALL  ú ú 01 Page 403 ú Jul 15/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 (2)  S 844-018Open the system shutoff valve.
 (3)  S 034-019Remove the shutoff valve knob.
 (4)  S 424-020Attach the unions with new O-rings to the shutoff valve.
 (5)  S 424-021Use the mounting screws to attach the system shutoff valve to the valve support.
 (6)  S 424-022Install the valve support and the system shutoff valve that are attached together. (a) Connect the inlet line. (b) Connect the outlet line. (c) Install the screws that attach the valve support to the structure.
 S 844-023

 WARNING:_______YOU MUST OPEN THE VALVE SLOWLY AND CAREFULLY. IF YOU DO NOT OPEN THE VALVE SLOWLY HIGH TEMPERATURES CAN OCCUR AND CAUSE AN EXPLOSION AND INJURY TO PERSONS.
 (7)  
In the forward cargo compartment slowly open the shutoff valve of the crew oxygen cylinder.

 S 794-024

 (8)  
Use the oxygen leak detection compound to do a check on the system shutoff valve connection for leaks.

 S 424-025

 (9)  
Install the angle.

 S 414-026

 (10)
 Install the trim panel.

 S 414-027

 (11)
 Put the insulation against the panel.

 S 424-028

 (12)
 Install the shutoff valve knob.

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 35-12-31
 ALL  ú ú 01 Page 404 ú Nov 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 434-029
 (13)
 Tighten the knob set screw.

 S 844-030

 (14)
 Keep the system shutoff valve open.
　
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