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 Change 6 3--79 3--6 ARMAMENT AND CAB MAINTENANCE — CONTINUED 3--6.8 Breech Mechanism — Continued c. Assembly — Continued NOTE Step 25 applies to M49 firing mechanism on M109A5 M284 cannon assembly. 25 Assemble M49 firing mechanism. (a) Install firing hammer (66) in access cover (67). (b) Install hammer guide yoke (56) on firing hammer (66) so groove in firing hammer lines up with holes in hammer guide yoke. NOTE Apply grease (item 17, Appx D) to holes in hammer guide yoke prior to installing bearing balls. (c) Install spring (64) and sleeve bushing (63) on hammer guide yoke (56) and install three bearing balls (65) into hammer guide yoke holes between spring coils. Slide sleeve bushing against spring until spring is fully compressed against access cover (67). (d) Pull firing hammer (66) from hammer guide yoke (56) until sleeve bushing (63) locks in place. NOTE Use a 1--1/8 inch (2.86 cm) socket and M34 or M18 fuzesetter to complete assembly. (e) Set yoke and hammer group (76) on socket so firing hammer (66) hangs freely. 66 67 56 64 63 65 76