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 5-5 FUZES — CONTINUED d. Fuze Assembly The following procedures apply to all fuzes. See step 2 for special instructions for the M577 series fuze. 1 Assembly of fuze to projectile. (a) (b) Rounds fired without a fuze or with improperly seated fuzes may result in premature functioning, Screw fuze (6) in by hand. If binding occurs, inspect fuze cavity and threads of both fuze and projectile. Reject whichever is at fault. When tightening fuze to projectile, do not hammer on fuze-setter wrench or use extension handle on fuze-setter wrench. Do not stake fuze to projectile under any circumstances. Shocks transmitted to fuzes during assembly may cause a malfunction resulting in injury to personnel. Always be sure that the supplementary charge is in the deep cavity projectile before adding fuze-booster combination or projectile will not detonate properly. NOTE For long intrusion proximity fuzes with a gap between the fuze shoulder and projectile, either replace the supplementary charge and fire with impact PD, MTSQ, ET, or short-intrusion VT fuze, or dispose of round. After assembling fuze (6) by hand, back fuze off 1/4 turn. Another cannoneer holds projectile to ensure cannoneer no. 2 can firmly seat fuze. Using Ml 8 fuze-setter wrench (7), tighten fuze to projectile with a sharp snap of the M18 fuze-setter wrench so that the fuze shoulder is seated firmly against the projectile nose. 5-50