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 3-4 TROUBLESHOOTING — CONTINUED MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION CANNON—CONTINUED 17. PRIMER NOT EJECTED PROPERLY. Step 1. Check to see if primer chamber is dirty or pitted. Clean as necessary (para 2–12.5). Step 2. Check to see if cartridge extractor is bent or broken. Notify unit maintenance if defective. 18. CAB FILLS WITH SMOKE OR GASES AFTER FIRING. Step 1. Step 2. Step 3. Clean, lubricate, and inspect bore evacuator, bearing balls, orifices, and valve rings for serviceability (para 3-6.7). Notify unit maintenance if defective parts are found. Check to see if retaining rings are properly installed (para 3-6.8). Rotate so that splits in rear and front retaining rings are 180° apart. Visually check for worn obturator pad or deformed retaining rings. NOTE If obturator pad or retaining rings are defective, replace on M109A5 howitzers or notify unit maintenance for replacement on M109A2/M109A3/M109A4 howitzers. If defective, remove spindle assembly (para 3-6.8) and notify unit maintenance or replace obturator pad or retaining rings. 19. BORE EVACUATOR OR MUZZLE BRAKE THRUST COLLAR BECOMES LOOSE. Step 1. Step 2. Check for loose or missing setscrew that secures bearing bail and spring. This setscrew should be staked. Notify unit maintenance if setscrew is missing or loose. Check functioning of bearing ball and spring. Notify unit maintenance if bearing ball is stuck or spring appears broken. 3-10