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 112 of 590

TM 9-1240-401-34&P

I

3-30. M118A2/M118A3 ELBOW TELESCOPE LEVEL ASSEMBLY LEAKAGE TEST

- continued

13

14

15

16

17

Remove level 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 level assembly (6) from fabricated leak test

adapter (7).

If air bubbles were detected, repair level assembly

(ref. para 3-18 for Ml 18A3; para 3-19 for

M118A2) and repeat the level assembly leakage

test.

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

wiping rag to dry level assembly.

3-31. M118A2 ELBOW TELESCOPE COVER ASSEMBLY LEAKAGE TEST

I

ITIAL SET-UP

Tools and Special Tools

aterials/Parts

Nitrogen, technical (Item 8, appx B)

Adapter, leak test, fabricated (fig. C-1 appx

Wiping rag (Item 12, appx B)

c)

ment Condition

Purging kit (Item 22, appx F)

Ml 18A2/M1 18A3 elbow telescope removed

from howitzer (TM 9-2350-311-10)

Tool Kit, Electronic System, Repair, Field

Maintenance (SC5180-95-CL-B29)

Cover assembly removed,

5180–01-168-0487

M118A2 (ref. para 3-17)

1 Secure pressure regulator(1) to a tank containing

pressurized nitrogen.

If registered pressure is 100 psi (689.48 kPa)

or less, obtain a replacement.

2 Open nitrogen tank valve (2) and observe pressure

gage (3). Gage should indicate pressure in nitro-

gen tank.

3-54