TM-9-2350-311-20-2 Maintenance Manual Volume 2 for M109 Cab Download
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TM 9–2350–311–20–2 Change 3 3–5 3–3 TROUBLESHOOTING CHART a. BREECH MECHANISM The breech mechanism consists of the breech operating handle with detent plunger, cradle cam, clutch pin, firing mecha- nism block assembly with firing mechanism, and spring pack. Below is a pictorial view of the breech mechanism. The breech operating handle is used to open the breech prior to firing. The breech will open automatically after firing of the cannon. The cradle cam is used to close the breech. The firing mechanism is used with a primer to fire the cannon. OPERATING CAM BREECHBLOCK FIRING MECHANISM ASSEMBLY BLOCK ASSEMBLY (FIRING) SPINDLE ASSEMBLY ADJUSTER LEAF SPRING (LOCATED AT BOTTOM)