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 480 of 775

TM 9-2350-311-10

3-6 ARMAMENT AND CAB MAINTENANCE — CONTINUED

3-6.8

Breech Mechanism — Continued

c. Assembly — Continued

15

16

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18

19

20

Slightly raise operating cam (12) to clear rollers (11).

Depress detent (13) with punch.

Rotate breechblock (9) to UNLOCKED position.

Pull carrier assembly (39) until rollers (11) aline with operating cam (12) path and slowly lower operating

cam into rollers.

Engage clutch pin (75). Raise operating cam (12) enough to clear rollers (11).

Close breechblock (9), using one soldier to move operating handle (10) to CLOSED position and the

other to support the breechblock. If timing marks (72) are not alined, the breechblock is out of time.

Repeat steps 1 through 5.

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