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 472 of 775

TM 9-2350-311-10

3-6 ARMAMENT AND CAB MAINTENANCE — CONTINUED

3-6.8

Breech Mechanism —Continued

b. inspection of Spindle Assembly Components

1 Inspect obturator pad (36) for evidence of leakage past sealing surfaces. Replace obturator pad if sliced,

cracked, chipped, or damaged.

2 Inspect retaining rings (34 and 37) for deformed shape as determined by the following.

(a) Maximum allowable circular spread for front retaining ring (37) is 3/8 inch (9.5 mm). The maximum

allowable circular spread for the rear retaining ring (34) is 1/8 inch (3.2 mm).

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