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Figure 3-47.  Purging and Charging M118 Series Elbow Telescope
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Figure 3-48.  Pressurizing Level Assembly
TM 9-254 3-23. Level Assembly and Cover Assembly Leakage Test. a. Purpose of Test.  To leak test level assemblies 11731291 or 10543755 and cover assembly 10543756 prior to installation on the elbow telescope.  This procedure will help eliminate the possibility of the unit developing a leak during the over all leakage test of the elbow telescope. b. Level Assembly 11731291 or 10543755.  Perform the leakage test for the level assembly as follows: NOTE o Steps (2) through (7), refer to figure 3-48. o Insure that preformed packing is secured to bottom of level assembly before securing to fabricated adapter. (1) Perform the setup of the single stage pressure test fixture as described in paragraph 3-18a. (2) Secure level assembly (7) to the fabricated leak test adapter (4) (fabricate per fig. C-1, appx C) with four machine screws (3) and four wing nuts (5). (3) Connect hose assembly (8) to the inlet port (6) on fabricated leak test adapter (4). (4) Adjust pressure regulator valve (2) clockwise until 1 psig is registered on the low pressure gage (1). (5) Maintain a 1 psig pressure for 10 seconds, then adjust pressure regulator valve (2) counterclockwise to the closed position. (6) Disconnect hose assembly (8) from the inlet port (6) and lay hose assembly aside. NOTE Steps (7) through (9), refer to figure 3-49. (7) Completely immerse the level assembly (5) and fabricated leak test adapter (3) into a container of clear water (1). (8) While  immersed,  inspect  the  areas  around  the  level  vial  (4)  and  lamp  shell  (2)  for  the  presence  of  air bubbles that indicate pressure leaks. (9) Remove level assembly (5) and fabricated leak test adapter (3) from the container of clear water (1). NOTE Steps (10) through (12), refer to figure 3-48. (10)  Release pressure from fabricated leak test adapter (4) at inlet port (6). 3-50

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