S 013-010
 (4)  Get access to the crew oxygen cylinder.
 (a)  The cylinder is found in the forward cargo compartment on the forward right sidewall.
 G. Procedure - Remove the Oxygen Cylinder
 S 863-017
 CAUTION: DO NOT TIGHTEN THE VALVE MORE THAN THE GIVEN TORQUE.
_______
 DAMAGE TO THE VALVE CAN OCCUR.

 (1)  Close the shutoff valve on the crew oxygen cylinder and tighten with your hand.
 NOTE: When you tighten the valve with your hand, this is
____ the equivalent to a maximum torque of 25 pound-inches.
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737-300/400/500MAINTENANCE MANUAL
 S 873-013
 WARNING:_______SLOWLY AND CAREFULLY OPEN LINE CONNECTIONS. THE REMAINING PRESSURE IN THE LINE CAN RELEASE WITH A LARGE FORCE. INJURY TO PERSONS AND DAMAGE TO THE EQUIPMENT CAN OCCUR.
 (2)  
Slowly loosen the coupling nut of the high pressure cylinder from the oxygen cylinder port to release the pressure.

 S 033-014

 (3)  
Disconnect the overboard discharge line.

 S 033-015

 (4)  
Disconnect the coupling nut of the high pressure cylinder.

 S 033-016
 WARNING: YOU MUST SEAL ALL THE CONNECTIONS WITH A CLEAN CAP TO
_______ PREVENT CONTAMINATION. YOU MUST USE METAL CAPS WHEN THE CONNECTOR THREADS ENGAGE THE CAP. YOU MUST CLEAN ALL CAPS THAT YOU USE FOR THE OXYGEN SYSTEM BEFORE YOU INSTALL THEM. REFER TO THE OVERHAUL MANUAL FOR THE PROCEDURES TO CLEAN THE OXYGEN SYSTEM COMPONENTS. CONTAMINATION IN THE OXYGEN SYSTEM CAN CAUSE A FIRE OR AN EXPLOSION AND CAN CAUSE INJURY TO PERSONS AND CAUSE DAMAGE TO THE EQUIPMENT.
 (5)  
Release the clamps and remove the cylinder assembly.

 (6)  
Use caps to seal the connections on the cylinder.

 S 533-018

 (7)  
If you do not install a replacement cylinder immediately, install caps on the aircraft line connections.

 S 533-017
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737-300/400/500MAINTENANCE MANUAL
 S 433-019
 CAUTION: YOU MUST TIGHTEN THE CAP ON THE CYLINDER BY THE GIVEN
_______ TORQUE. CYLINDER LEAKAGE CAN OCCUR WHILE IT IS STORED.
 (8)  For cylinders with metal seats in the shutoff valve, do the steps that follow:
 (a)  
Install the cap on the inlet/outlet line.

 (b)  
The cap is attached to the valve with a chain.

 (c)  
Tighten the cap to a torque of 350 - 400 pound-inches.

 H. Procedure - Install the Crew Oxygen Cylinder
 S 213-020
 (1)  Make sure it has not been more than three years since the oxygen cylinder had its last hydrostatic test.
 NOTE: The last hydrostatic test date will be stamped on the neck
____
 of the oxygen cylinder.

 S 213-021
 (2)  
Make sure the cylinder is in serviceable condition.

 S 033-022

 (3)  
If installed, remove the cap on the airplane connection.

 (a)  Examine the connection fittings and make sure they are clean and free of contamination.
 S 033-023
 WARNING: YOU MUST OPEN THE PRESSURE CAP SLOWLY, AND BLEED OFF THE
_______ REMAINING PRESSURE. IF YOU REMOVE THE CAP TOO QUICKLY THE CAP CAN BLOW OFF WITH A LARGE FORCE. INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
 (4)  Remove all the lockwire or cotter pins that hold the cap on the oxygen cylinder.
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