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 701 of 828

TM 9–2350–311–20–2

Change 2

18–33

c.

Disassembly

NOTE

Refer to either the early design or later design illustrations when performing these procedures.

1

Remove air valve cap (6), valve core (7), purging valve stem (8) and strap (9).

2

Remove exit port machine screw (10).

3

Remove machine screw (11), lockwasher (12), electrical cover (13), spacer (14), and LED (15). Discard

lockwasher.

4

Disconnect extension light assembly (16) from rear of M15 quadrant (4).

5

Remove lens (17) and LED (18) from extension light assembly (16).

d.

Assembly

1

Install LED (18) and lens (17) in extension light assembly (16).

2

Connect extension light assembly (16) to rear of M15 quadrant (4).

3

Install spacer (14) onto LED (15).

4

Install LED (15) with spacer (14), electrical cover (13), new lockwasher (12), and machine screw (11).

5

Install exit port machine screw (10).

6

Apply sealing compound to purging valve stem (8) threads.

7

Install strap (9), purging valve stem (8), valve core (7), and air valve cap (6).

LATER DESIGN

17

18

16

10

9

8

7

6

13

15

10

11

12

EARLY DESIGN

14