(1)  
Close the shutoff valve of the crew oxygen cylinder to a maximum torque of 25 pound-inches.

 (2)
Make sure that the system shutoff valve on the P6 panel is open.

 S 844-067

 (3)  
Push and hold the sliding control on the stowage box of the captain in the direction of the arrow.

 S 844-068

 (4)  
Move the oxygen dilution control on the mask and regulator assembly of the captain to 100%.

 S 844-066
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 ALL  ú ú 02 Page 401 ú Jul 15/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

 COMPENSATOR)SEE

Pressure Reducing Regulator
Figure 401

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 844-069
 (5)  
Push and hold the emergency control knob.

 S 844-070

 (6)  
Release the sliding control and the emergency control knob when the flow blinker changes from a yellow cross to all black.

 F. Remove the Assembly
 S 864-014
 (1) Open this circuit breaker panel and attach a DO-NOT-CLOSE tag:
 (a)  P18 Circuit Breaker Panel
 1) OXYGEN SYSTEM IND.

 S 034-015
 (2)  
Disconnect the electrical connector of the pressure transducer.

 S 034-016

 (3)  
Disconnect the supply line from the elbow of the pressure reducing regulator.

 S 034-018

 (4)  
Loosen the coupling nut between oxygen cylinder and the cylinder coupling assembly.

 S 024-019

 (5)  
Remove the assembly.

 TASK 35-12-11-004-020
 3. Remove the Cylinder Coupling from the Assembly
_______________________________________________
 A. General
 (1)  Read the safety precautions and the general maintenance instructions of the oxygen system in 35-00-00/201, Oxygen.
 B. References
 (1)  35-00-00/201, Oxygen
 C. Access
 (1)  Location Zone
 113 Forward Cargo Compartment, Right

 D. Procedure
 S 034-021
 (1)  
Remove the assembly per paragraph 2.

 (2)
Remove the pressure transducer from the cylinder coupling.

 S 034-022
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 01 Page 403 ú Nov 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 034-023
 CAUTION:_______DO NOT USE THE TRANSDUCER OR THE COUPLING AS A LEVER. USE A WRENCH ON THE TRANSDUCER SQUARE BOSS AND ON THE COUPLING HEX NUT, OR DAMAGE TO COMPONENTS CAN OCCUR.
 (3)  
Remove the plug from the cylinder coupling.

 S 024-024

 (4)  
Remove the cylinder coupling from the pressure reducing regulator.

 TASK 35-12-11-004-025
 4.  Remove the Pressure Reducing Regulator from the Assembly_________________________________________________________
 A. General
 (1)  Read the safety precautions and the general maintenance instructions of the oxygen system in 35-00-00/201, Oxygen.
 B. References
 (1)  35-00-00/201, Oxygen
 C. Access
 (1)  Location Zone
 113 Forward Cargo Compartment, Right

 D. Procedure
 S 034-026
 (1)  
Remove the assembly per paragraph 2.

 S 024-027

 (2)  
Remove the pressure reducing regulator from the cylinder coupling.

 S 034-028

 (3)  
Remove the elbow (together with the nut) and washer from the pressure reducing regulator.
　
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