TM-9-2350-311-10

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

TECHNICAL MANUAL; OPERATOR’S MANUAL

NOVEMBER 1994

TM-9-2350-311-10 - Page 476 of 775

TM 9–2350–311–10

3–72

Change 3

3–6

ARMAMENT AND CAB MAINTENANCE — CONTINUED

3–6.8

Breech Mechanism — Continued

c.

Assembly — Continued

2

Wrap cleaning staff section (38) with rags (item 35, Appx D) and insert through breechblock (9).

3

With carrier assembly (39) in fully open position, lift breechblock (9) and insert one end of cleaning staff

section (38) into carrier assembly.

4

While alining scribed lines (73.3) and (73.1), slide breechblock (9) down cleaning staff section (38) onto

carrier assembly (39). Remove cleaning staff section from breechblock and carrier assembly.

5

With carrier assembly (39) in fully open position, aline closing lug (74) with detent (13). With gear rack

and sector gear timing marks (72) alined in the center of the inspection hole (73), slide breechblock (9)

completely onto carrier assembly. Recheck timing marks.