yellow color (flow condition) to a black color (no flow condition).

 (e)  
Release the sliding control and the emergency control knob.

 S 035-129
 CAUTION:_______DO NOT USE THE COUPLING BODY AS A LEVER. USE A WRENCH ON THE COUPLING HEX NUT, OR DAMAGE TO THE COUPLING CAN OCCUR.
 (3)  Disconnect the 0 - 2000 psi pressure gage from the cylinder
 coupling.

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737-300/400/500MAINTENANCE MANUAL
 (4)  S 435-101Install the plug on the cylinder coupling.
 (5)  S 435-083Torque the plug to 170 pound-inches.
 S 865-109

 WARNING: YOU MUST OPEN THE SHUTOFF VALVE SLOWLY AND CAREFULLY, OR
_______ HIGH TEMPERATURES CAN OCCUR. THIS CAN START AN IGNITION WITH THE OXYGEN AND CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRPLANE AND THE EQUIPMENT.
 (6)  
Slowly open the shutoff valve of the crew oxygen cylinder.

 S 795-085

 (7)  
Do a simplified leak test of the plug connection at the cylinder coupling.

 S 795-086

 (8)  
If there is leakage at the plug connection, do these steps:

 (a)  Bleed the system pressure again. 1) Close the shutoff valve of the crew oxygen cylinder. 2) Make sure the shutoff valve of the crew oxygen system in
 the control cabin is open. 3) On the captain's mask stowage box, push the sliding control in the direction of the arrow and hold.
 4)  On the captain's mask/regulator, do the steps that follow: a) Move the dilution control to 100%. b) Push the emergency control knob and hold. c) Monitor the flow blinker and make sure it changes from
 a yellow color and then to a black color.
 (b)  
Release the sliding control and the emergency control knob.

 CAUTION:_______DO NOT USE THE COUPLING BODY AS A LEVER. USE A WRENCH ON THE COUPLING HEX NUT, OR DAMAGE TO COUPLING CAN OCCUR.

 (c)  
Torque the plug to 220 pound-inches again.

 (d)  
Slowly open the shutoff valve of the crew oxygen cylinder.

 (e)  
Do a simplified leak test of the plug connection at the cylinder coupling.

 S 865-087
 (9)  Remove the electrical power if it is not necessary (AMM 24-22-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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737-300/400/500MAINTENANCE MANUAL
 PRESSURE REDUCING REGULATOR - REMOVAL/INSTALLATION
__________________________________________________
 1. General
_______
 A. The tasks that follow are given in this procedure:
 (1)  
Removal and installation of the cylinder coupling together with the pressure transducer and the pressure reducing regulator as an assembly

 (2)  
Removal and installation of the cylinder coupling

 (3)  
Removal and installation of the pressure reducing regulator.

 TASK 35-12-11-004-003
 2. Remove Cylinder Coupling, Pressure Transducer, and Pressure Reducing
____________________________________________________________________
 Regulator as an Assembly (Fig. 401)

________________________
 NOTE: Seal disconnected lines and ports with plugs to prevent contamination
____
 of the crew oxygen system.

 A. General
 (1)  Read the safety precautions and the general maintenance instructions of the oxygen system in 35-00-00/201, Oxygen.
 B. Standard Tools and Equipment
 (1)  Caps or Plugs - Package of Clean Protective
 C. References
 (1)  35-00-00/201, Oxygen
 D. Access
 (1)  Location Zone
 113 Forward Cargo Compartment, Right

 E. Bleed the Crew Oxygen System
 S 844-081
 CAUTION: IF THE VALVE IS TIGHTENED MORE THAN THE GIVEN TORQUE, THE VALVE
_______
 COULD BE DAMAGED.
　
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