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 333 of 775
TM 9--2350--311--10
Change 6
2--235
2--14 UNLOADING THE 155MM CANNON — CONTINUED
Procedure — Continued
WARNING
Ensure that unloading artillery rammer is used to prevent injury to personnel.
5
Cannoneers no. 2 and 3, assemble seven cleaning staff sections (6) with unloading artillery rammer (7).
They then insert unloading artillery rammer into muzzle brake (8) end of cannon tube (9), and push
carefully until unloading artillery rammer head encircles fuze and is seated against projectile. Steadily
increasing pressure is applied by tapping cleaning staff section with a wooden block until projectile is
loose.
6
When projectile is loosened, cannoneers no. 2 and 3 suspend operation of rammer, while chief of
section has breech opened by assistant gunner, and waste removed by cannoneer no. 1, who then
places rammer tray (not shown) in position to receive projectile.
7
Cannoneers no. 2 and 3 steadily push projectile out of breech and onto rammer tray.
8
Projectile is then disposed of as directed.
6
7
8
9
2--14.1
Unloading Procedures for MACS Propelling Charge Only
1
Slide firing mechanism block assembly left to eject primer, then slide firing mechanism block assembly
right to firing position.
2
Open breech block assembly.
NOTE
MACS increments must be removed one at a time.
3
Lift increment out of the swiss notch by using the thin black charge separator as a tool. Slide the
separator along the side of the increment then under to lift it up and out of the swiss notch.
4
If MACS charge two or higher was loaded into the weapon then elevate the cannon as needed to get
the increments to slide back into the swiss notch. Repeat step 3 above for each increment.
5
Follow instruction in previous section for unloading the projectile after MACS has been removed.
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