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Page Title: Installation Instructions for the M1091 M109Al/M115/M110 Howitzers and M107 Guns
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TM 9-6920-361-13&P
c.  End-for-end test. To perform
the end-for-end test of the gunner's
quadrant, refer to TM 9-1290-200-15
and the operator's manual for the major
caliber weapon.
2-7.
Installation  Instructions  for  the  M1091
M109Al/M115/M110 Howitzers and M107 Guns. The
14.5-mm gun barrel is mounted in the breech of the
M109/M109A1 155-mm howitzers, the M107 175-mm
gun and the M110 8-inch howitzer as a subcaliber
device. To mount the gun barrel and boresight the piece
follow steps 1 through 13.
Step 2: Remove the bolt. Install breech boresight disc.
(The breech boresight disc is a fired cartridge case that
has a 1/16-inch hole drilled in the center of the cartridge
base.
Step 1: Remove the obturator group, obturator spring,
and firing mechanism housing assembly (refer to the
operator's manual for the major caliber weapon).
Step 2: Remove adapter nut and washer.
Step 3: Attach cross thread to the muzzle.
Step 4: Sight the tube onto a distant aiming point (1, 500
meters). Aline panoramic telescope sight on the same
distant aiming point using the tangent screws on the
telescope mount or the telescope boresight adjusting
screw
NOTE
When  the  M115/M117  panoramic
telescope is mounted in the support
it is 1600 mils out of boresight. Since
Step 3: Install the key in the appropriate keyway and
it is impractical to turn the azimuth
secure with a screw: The top keyway is for the
scale 1600 mils using the boresight
M107/M110 weapons, the side keyway is for the M109
adjusting screw, the telescope head
and M109A1 155-mm howitzers. Adapter PN 11578870
will be turned to the distant aiming
has no keyway. Install screw in appropriate screw hole.
point, and then the reset counter will
be set to 3200. Use only the lower
scale  for  laying  and  referring.
Change 1 2-15

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