TM-9-2350-311-20-2

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR CAB, ARMAMENT, SIGHTING AND FIRE CONTROL, ELEVATING AND TRAVERSING SYSTEMS AND ASSOCIATED COMPONENTS

DECEMBER 1993

TM-9-2350-311-20-2 - Page 674 of 828

TM 9–2350–311–20–2

18–6

Change 2

18–2 M118A2/M118A3 ELBOW TELESCOPE

This task covers:

a.

Disassembly

b.

Inspection

c.

Assembly

INITIAL SETUP

Tools

Artillery and turret mechanic’s tool kit

(SC 5180–95–CL–A12)

Materials/Parts

Sealing compound (item 28, Appx D)

Self-locking nut (item 1, Appx G)

References

TM 9–2350–311–10

TM 750–116

Equipment Condition

M118A2/M118A3 Elbow telescope removed

(TM 9–2350–311–10)

a.

Disassembly

1

Remove air valve cap (1) and valve core (2) from purging valve stem (3).

2

Remove purging valve stem (3) from M118A2/M118A3 elbow telescope (4) and strap (5) from purging valve

stem (3) and from air valve cap (1).

3

Remove machine screw (6) from exit port.

4

Remove self-locking nut (7) and machine screw (8). Discard self-locking nut.

5

Remove loop clamp (9) and optical eyeshield (10).

6

Unscrew and remove lamp (11) in cover access (12) of M118A2 elbow telescope only.

7

Notify support maintenance for replacement of LEDs if damaged for M118A3 elbow telescope only.

8

Remove setscrew (13) and knob (14).

b.

Inspection

1

Notify support maintenance if lens (15) is scratched or cracked.

2

Notify support maintenance if eyepiece arm (16) does not move easily or remain in locked position.

3

For additional inspections refer to TM 9–2350–311–10.

c.

Assembly

1

Slide loop clamp (9) on optical eyeshield (10) and assemble to eyepiece end of M118A2/M118A3 elbow tele-

scope (4).

2

Secure optical eyeshield (10) with machine screw (8) and new self-locking nut (7).