TM-9-2350-311-10

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; OPERATOR’S MANUAL

NOVEMBER 1994

TM-9-2350-311-10 - Page 468 of 775

TM 9-2350-311-10

3-6 ARMAMENT AND CAB MAINTENANCE — CONTINUED

3-6.8

Breech Mechanism — Continued

a. Disassembly — Continued

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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).

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