TM-9-2350-311-10 M109 Operator's Manual for M109A2, M109A3, M109A4 and M109A5 Download
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TM 9-2350-311-10 3-6 ARMAMENT AND CAB MAINTENANCE — CONTINUED 3-6.8 Breech Mechanism — Continued c. Assembly — Continued 15 16 17 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. 3-76