TM-9-1240-401-34&P Technical Manual for M109 Telescopes and Mounts Download
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7 Make sure pressure regulator valve (8) is closed (fully counterclockwise). Then slowly open pres- sure regulator valve (8) until 1 psi (0.07 Kg/cm 2 ) registers on low pressure gage (9). a. Charge M42 periscope for 10 seconds. b. Turn pressure regulator valve (8) to off. 8 Apply a soap solution to all sealed joints and screws. Observe low pressure gage and M42 peri- scope for 5 minutes. If pressure drops or if bubbles appear, repair as necessary (ref. para 6-10). 9 Remove hose assembly (6). 10 Install air valve cap (2). 6-13/(6-14 blank)