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 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). 3-68