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 a. Disassembly — Continued 16 17 18 19 20 Remove spindle assembly (31) from breechblock (9). Push on spindle (32) as necessary. Remove the following from spindle (32): washer bearing (33), rear retaining ring (34), inner retaining ring (35), obturator pad (36), and front retaining ring (37). Do not apply oil or cleaning solvent to obturator pad to prevent damage to obturator pad. Clean obturator pad (36) with soap (item 12, Appx D) and water. Dry with clean rags (item 35, Appx D). Go to 3-6.8b. for inspection of spindle assembly parts. The breechblock weighs approximately 125 pounds (57 kg), It takes two personnel to remove the breechblock to prevent injury to personnel. Wrap cleaning staff section (38) with rags (item 35, Appx D) to protect carrier assembly (39) and breechblock (9). Insert cleaning staff section through breechblock and carrier assembly. While supporting cleaning staff section (38) at both ends, lift and slide breechblock (9) off carrier assembly (39). 3-64