TM-9-1240-401-34-P

TELESCOPE MOUNT M146: M118A2 AND M118A3; TELESCOPE MOUNT M145: M145A1; PANORAMIC TELESCOPE: M117 AND M117A2; FIRE CONTROL QUADRANT: M15; PERISCOPE: M42

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL

JULY 1993

  TM-9-1240-401-34-P - Page 111 of 590

TM 9-1240-401-34&P
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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.
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