Installation Instructions for the M101A1 Howitzer (cont)

TM 9-6920-361-13&P

Step 5: Place the gun barrel in the adapter and engage

the barrel trunnions with the adapter slots.

Step 2: Remove the four head cap socket screws and

the adapter cap.

NOTE

Adapter PN 11578873 does not have

short screws.

Step 3: Remove the elevating arc from the gun barrel by

Step 6: Lock the barrel into position by securing the

removing the two mounting screws.

adapter cap to the body (short screw must be in

upper right hole). Do not tighten the four screws

yet.

Step 4: Attach fine thread across the four witness marks

on the end of the tube by using a rubber band.

Step 7: Boresight the 14.5mm gun in the following

Also place boresight strings on the muzzle of the

sequence:

bowitzer.

Remove the bolt and install the breech

boresight disc.

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