Installation Instructions for the M101A1 Howitzer

TM 9-6920-361-13&P

7. Sighting through the breech boresight disc

aline the 14.5mm barrel on the DAP.

8. Refer the panoramic sight to the DAP. The

reading should be 3200 mils. If the reading is not 3200

adjust to 3200 mils.

Remove boresight disc and install bolt.

Step 11.

Lock the barrel into position by securing the

adapter cap to the body (short screw in upper right hole).

Do not tighten the four screws yet.

Step 13:

Turn the safety ring to the "fire" position.

Place the lanyard ring over the rear of the breech,

matching the openings of breech and the lanyard ring.

2-8.

Installation Instructions for the M101A1

Howitzer. The 14.5-mm gun barrel is mounted in the

breech of the M101A1 howitzer as a subcaliber device.

To mount the gun barrel, follow steps 1 through 8.

Step 12:

Close the breech, remove the bolt by pulling

down on the locking cap and pulling bolt to the rear. To

boresight the 14.5 mm device:

1. Tighten both elevating adjusting screws

against the barrel.

2. Place the breech boresight disc in the

cartridge chamber.

3. Sighting through the breech boresight disc,

aline the horizontal boresight string of the 14.5 mm barrel

with the horizontal boresight string of the primary weapon

by adjusting elevating adjusting screws (the rear screw

lowers the barrel, the front screw raises the barrel).

4. Tighten the four adapter cap screws.

Verify the alinement of the muzzle

Step 1: Open the breech and place the adapter in the

horizontal boresight strings.

Remove the muzzle

breech recess. (If the weapon is going to be moved,

boresight strings from the primary weapon.

remove the breech block). Make sure the two clamping

6. Select a distant aiming point (DAP) at least

screws are in an unscrewed position. Tighten the two

1,500

meters

from

the

weapon.

clamping screws.

2-17