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 582 of 775

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