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 467 of 775

TM 9-2350-311-10

3-6 ARMAMENT AND CAB MAINTENANCE

— CONTINUED

3-6.8

Breech Mechanism — Continued

a. Disassembly — Continued

13

14

15

Slide firing group block (1) to extreme right hand position.

NOTE

Cartridge extractor is located inside firing group block.

Some howitzers may have different configurations of housing.

Partially withdraw nut (17) by moving cartridge extractor (27) away from nut. Support firing group block

(1) and housing (28). Using spanner wrench, remove nut.

If completely disassembling breech mechanism, remove block assembly (29), housing (28), and spring

(30).

3-63