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 120 of 828

TM 9–2350–311–20–2

Change 2

3–11

a.

BREECH MECHANISM — CONTINUED

(3)

BREECH DOES NOT OPEN AUTOMATICALLY

AFTER FIRING.

INITIAL SETUP

Tools

Artillery and turret mechanic’s tool kit

(SC 5180–95–CL–A12)

References

TM 9–2350–311–10

Check vertical and horizontal adjustment of operating

cam, cradle cam stop (para 5–12) and damper

assembly (para 5–11).

Are either operating cam or damper assembly out of

adjustment?

Attempt to open breech manually.

Does the breech open?

Inspect operating crank rollers and operating cam

for damage.

Are either operating crank rollers or operating cam

damaged?

A

B

yes

no

Go to para 3–3a.(1).

Notify support

maintenance.

yes

no

C

CONTINUED ON NEXT PAGE

yes

no

Adjust operating cam, cradle

cam stop (para 5–12) and

damper assembly (para

5–11). If malfunction per-

sists, inspect damper as-

sembly springs and replace

if necessary (para 5–11).