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 113 of 590

TM 9-1240-401-34&P

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Adjust pressure regulator (1) by rotating handle (4)

until pressure gage (5) indicates 5 psi (34.47 kPa).

Close nitrogen tank valve (2).

Install preformed packing on bottom of cover as-

sembly (6).

Secure cover assembly (6) to fabricated leak test

adapter (7) with four machine screws (8) and four

wing nuts (9).

Connect hose assembly (10) to inlet port(11) on

fabricated leak test adapter (7).

Adjust handle (4) counterclockwise until 1 psig

(6.89 kPa) is registered on the low pressure gage

(5).

Maintain a 1 psig (6.89-kPa) pressure for 10 sec-

onds, then turn handle (4) clockwise to the closed

position.

Disconnect hose assembly (10) from the inlet port

(11) and lay hose assembly (10) aside.

Completely immerse cover assembly (6) and fabri-

cated leak test adapter (7) in a container of clear

water.

While cover assembly (6) is immersed, inspect the

area around the lamp shell (12) for air bubbles that

indicate a pressure leak.

Remove cover assembly (6) and fabricated leak

test adapter (7) from the container of clear water.

Release pressure from fabricated leak test adapter

(7) at inlet port (11).

Remove four wing nuts (9), four machine screws

(8), and cover assembly (6) from fabricated leak

test adapter (7).

If air bubbles were detected, repair cover assembly

(ref. para 3-17) and repeat the cover assembly

leakage test.

If air bubbles were not detected, use a clean, dry

wiping rag to dry cover assembly.

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