S 034-029

 (4)  
Remove and discard the O-ring.

 TASK 35-12-11-404-030
 5.  Install Pressure Reducing Regulator to Assembly (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)  D00173 Lubricant - Krytox 240AC (Ref. 20-30-21)
 C. Access
 (1)  Location Zone
 113 Forward Cargo Compartment, Right

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A
737-300/400/500MAINTENANCE MANUAL
 D. Install the Elbow
 S 424-083
 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.
 (1)  
Turn the nut on the elbow.

 S 424-032

 (2)  
Make sure that the threads of the nut engage the second set of threads against the shoulder on the elbow.

 S 434-037

 (3)  
Install the washer on the elbow.

 S 644-033

 (4)  
Apply a thin layer of lubricant to a new O-ring.

 S 434-038

 (5)  
Install the washer on the elbow until it touches the second set of threads.

 S 424-035

 (6)  
Connect the elbow on the pressure reducing regulator so that it turns freely.

 S 424-036

 (7)  
Align the elbow.

 S 434-039

 (8)  
Tighten the nut.

 E. Install the Pressure Reducing Regulator on the Cylinder Coupling
 S 644-040
 (1)  Apply a thin layer of lubricant to a new O-ring.
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A 737-300/400/500MAINTENANCE MANUAL
 S 434-041
 (2)  
Install the O-ring on the union of the cylinder coupling.

 S 424-042

 (3)  
Tighten the pressure reducing regulator on the union connection to a torque of 200 pound-inches.

 F.  Align the Pressure Reducing Regulator to the Cylinder Coupling If Necessary
 S 424-043
 (1)  
Loosen the connection between the cylinder coupling and the union.

 S 424-044

 (2)  
Align the pressure reducing regulator.

 S 434-045

 (3)  
Tighten the connection between the cylinder coupling and the union to a torque of 170 pound-inches.

 TASK 35-12-11-424-046
 6.  Install the Cylinder Coupling to 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 434-047
 (1)  
Install the plug on the cylinder coupling.

 (2)  
Tighten the plug to a torque of 170 pound-inches.

 S 434-048
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A 737-300/400/500MAINTENANCE MANUAL
 S 424-049
 (3)  
Install the pressure transducer on the cylinder coupling.

 S 424-050

 (4)  
Align the pressure transducer on the cylinder coupling.
　
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