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 261 of 828

TM 9–2350–311–20–2

5–5

5–3

FIRING MECHANISM ASSEMBLY, M49 (M284 CANNON)

This task covers:

a.

Disassembly

b.

Inspection

c.

Assembly

INITIAL SETUP

Applicable Configuration

M109A5 howitzer

Tools

Artillery and turret mechanic’s tool kit

(SC 5180–95–CL–A12)

M34 Fuzesetter (item 1, Appx H)

Materials/Parts

GAA (item 17, Appx D)

Personnel Required

2

Equipment Condition

Firing mechanism removed (TM 9–2350–311–10)

a.

Disassembly

1

Place firing mechanism (1) on solid surface.

2

Place M34 fuzesetter over follower (2) and depress until grooved pin (3) can be removed from manual control

lever (4) and hammer guide yoke (5). Remove grooved pin and manual control lever.

WARNING

Springs are under compression. Raise M34 fuzesetter, follower, and case assembly slowly or per-

sonnel injury may result.

3

Raise and remove M34 fuzesetter, follower (2), and case assembly (6).

4

Remove two retaining rings (7) and two grooved pins (8) from case (9), if damaged.

8

7

2

3

4

6

9

1

5