Installation Instructions for the M114A1 Howitzer

TM 9-6920-361-13&P

2-10. Installation Instructions for the M114A1

Howitzer. To mount the barrel in the M114A1 howitzer

and boresight the device, follow steps 1 through 13.

Step 1: To remove the obturator group, obturator spring,

and firing mechanism housing assembly, refer to the

Step 5: Insert the adapter (top up) in the breech-block.

operator's manual for the major caliber weapon.

Step 2: Remove adapter nut and washer.

Step 6: Place the washer on the adapter. Tighten the

nut all the way down, then loosen it two turns. The

loosening of the nut allows the breech to be closed fully.

Step 3: Place the obturator spring in the firing

mechanism housing recess.

Step 7: Remove the four head cap socket screws and

the adapter cap.

Step 4: Install the key in the keyway and secure with a

screw.

NOTE

Adapter PN 11578876 does not have

Step 8: Remove the elevating arc from the gun barrel by

keyway. Use as issued with screw

removing the two mounting screw.

and jam nut.

Change 1 2-21