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Figure 3-46.  Two Station Pressure Test Fixture
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Section IX.  PURGING AND CHARGING FIRE CONTROL EQUIPIENT
TM 9-254 3-19. Short Term Shutdown of Purging and Charging Equipment. a. Short Term Shutdown for Single Stage Fixture (fig. 3-45). (1)   With hose still connected to the purged unit, close tank valve (5) hand tight by turning clockwise. (2) Turn  pressure  regulator  valve  (4)  counterclockwise  until  it  moves  easily  in  either  direction.    Pressure regulator valve is closed. (3) Loosen  hose  (8)  connected  at  the  purged  unit.  Let  pressure  on  the  low  pressure  gage  (1)  go  to  0. Remove hose from purged unit. (4) Open pressure regulator valve (4) by turning clockwise.  Gas will flow through the low pressure gage (1) and out the open end of hose (8). (5) When gas has been completely exhausted from  the  hose  (8),  both  the  low  pressure  gage  (1)  and  the high pressure gage (3) will indicate 0.  Close pressure regulator valve (4) by turning it counterclockwise until it moves easily in either direction. b. Short Term Shutdown for a Two Station Pressure Test Fixture (fig. 3-46). (1) With the hose still connected to the purged unit, close tank valve (3) hand tight by turning clockwise. (2) Turn  regulator  valve  (13)  counterclockwise  until  it  moves  easily  in  either  direction.    Pressure  regulator valve is closed. (3) Loosen  feeder  tube  connected  to  the  purged  unit.    Let  pressure  on  the  test  fixture  gage  (11)  go  to  0. Remove feeder tube from purged unit. (4) Open regulator valve (13) by turning it clockwise.  Gas will flow out the open end of the feeder tube. (5) When gas has been completely exhausted from the feeder tube, the test fixture gage (11), high pressure gage   (2),   and   low   pressure   gage   (1)   will   indicate   0.      Close   regulator   valve   (13)   by   turning   it counterclockwise until it moves easily in either direction. (6) Close manifold valve (10) and disconnect feeder tube from outlet pipe (6) and block off outlet pipe with the stopper (7). 3-20. Time Cycles. a. Maintenance  personnel  will  purge  and  charge  fire  control  materiel  every  90  days  or  when  condensation  is evident in the instrument. NOTE The 90 day cycle does not apply to rangefinder end housings which are purged and charged once a year.  However, a visual inspection is required every 90 days for evidence of moisture. 3-47

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