TM-9-2350-311-20-2 Maintenance Manual Volume 2 for M109 Cab Download
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TM 9–2350–311–20–2 3–6 Change 2 3–3 TROUBLESHOOTING CHART — CONTINUED a. BREECH MECHANISM — CONTINUED (1) BREECH DOES NOT OPEN MANUALLY. INITIAL SETUP Tools Artillery and turret mechanic’s tool kit (SC 5180–95–CL–A12) Spanner wrench (item 17, Appx H) References TM 9–2350–311–10 Notify support maintenance. 1. Slide firing group block to the right OPEN position. 2. Disengage plunger assembly from obturator spindle nut (para 5–7). 3. Check obturator spindle nut for looseness. Is obturator spindle nut loose? Go to step D. yes no Check the operating handle plunger and operating handle clutch for proper operation (TM 9–2350–311–10). Do they operate properly? yes no A B CONTINUED ON NEXT PAGE C 1. Tighten obturator spindle nut using spanner wrench. 2. Engage plunger assembly with obturator spindle nut (para 5–7). 3. Attempt to open breech. Does breech open? OPERATING HANDLE CLUTCH OPERATING HANDLE PLUNGER PLUNGER ASSEMBLY OBTURATOR SPINDLE NUT FIRING GROUP BLOCK