TM-9-1240-401-34&P Technical Manual for M109 Telescopes and Mounts Download
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TM 9-1240-401-34&P 1 2 3 4 5 6 7 8 9 10 11 12 Secure pressure regulator (1) to a tank containing pressurized nitrogen. If registered pressure is 100 psi (689.48 kPa) or less, obtain a replacement. Open nitrogen tank valve (2) and observe pressure gage (3). Gage should indicate pressure in nitro- gen tank. Adjust pressurized regulator by rotating handle (4) until pressure gage (5) indicates 5 psi (34.47 kPa). Close nitrogen tank valve (2). Circuit card assembly must be removed from M1 18A3 elbow telescope level assembly prior to securing on fabricated leak test adapter (ref. para 3-1 8). Secure level assembly (6) to fabricated leak test adapter (7) with four machine screws (8) and four wing nuts (9). Connect hose assembly (10)to the inlet port (11 ) on fabricated leak test adapter (7). Open nitrogen tank valve (2). Adjust handle (4) counterclockwise until 1 psi (6.89 kPa) is registered on the low pressure gage (5). Maintain a 1-psig (6.89-kPa) pressure for 10 sec- onds; then adjust handle (4) clockwise to the closed position. Disconnect hose assembly (10) from the inlet port (11 ) and lay hose assembly (10) aside. Completely immerse level assembly (6) and fabri- cated leak test adapter (7) in a container of clear water. While level assembly is immersed inspect the areas around the level (12) vial and lamp shell (13) for air bubbles that indicate pressure leaks. 3-53