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Section VII.  SAFE STORAGE OF LOOSE PARTS
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Figure 3-45.  Single Stage Pressure Test Fixture
TM 9-254 Section VIII. USE OF PURGING AND CHARGING EQUIPMENT 3-17. General. This section contains general procedures for the setup of purging and charging equipment necessary to purge and charge fire control instruments.  Refer to TM 750-116 (General Procedures For Purging and Charging Fire Control Instruments) for procedures on specific fire control instruments. 3-18. Set Up of Purging and Charging Equipment (figs. 3-45 and 3-46). a. Set  Up  of  Single  Stage  Pressure  Test  Fixture  (fig.  3-45).    Set  up  the  single  stage  pressure  test  fixture  as follows: (1) Obtain a tank (7) of dry nitrogen and remove threaded protective cover (6) from the outlet of the tank. Open tank valve (5) momentarily to rid valve seat of any foreign matter. WARNING Do not drop tank of compressed nitrogen gas.  When using in confined areas, use extreme care; gas could cause asphyxiation. (2) Securely attach regulator (2) to tank valve (5) using appropriate adapter supplied with purging kit. NOTE Two regulator assemblies are presently in use for purging and charging fire control materiel.  The insert on figure 3-45 shows regulator 5580922 while the tank is shown with regulator 11729749. (3) Securely attach hose assembly (8) to the adapter (9). NOTE When using regulator 11729749, adapter 10917072-2 is required to connect hose assembly to low pressure port of regulator. (4) Rotate pressure regulator valve (4) counterclockwise to the extreme closed position. (5) Open  the  nitrogen  tank  valve  (5)  slowly  until  the  maximum  tank  pressure  is  registered  on  the  high pressure gage (3). NOTE If pressure indicated is less than 100 psig, obtain and use replacement tank. 3-43

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