FRAME 4

TM 9-2350-222-20-2-1

SYNCHRONIZATION AND BACKLASH CHECK OF 165 MM GUN WITH

3-4.

GUNNER'S PERISCOPE M32C-RAMP METHOD (CONT)

Procedure

Step

NOTE

Always lay the gun and reticle, when rotating boresight

knobs (1) and (2), from low to high and from right to left

without overtravel. Recheck sight retitles to insure that

reticle movement did not occur after slipping scales on

boresight knobs. If movement occurred after boresight

knobs are locked, relay retitles and recheck for movement.

If movement of periscope reticle exceeds 0.1 mil, notify

support maintenance. (Thickness of reticle lines equal 0.1

mil.)

Index 89 mils on the gunner's quadrant M1A1 (3) and place quadrant on breech ring

quadrant seats with Line-of-Fire arrow facing breech end of 165-MM gun.

NOTE

Hold quadrant in place when tank is being moved.

Have driver back tank up ramp or hill until the bubble in gunner's quadrant M1A1 (3)

is approximately centered.

Stop tank and shut down power plant.

W bile looking through breech boresight hole (4) with binoculars (5), manually position

gun without over travel so that cross formed by threads (6) on gun muzzle is lined up

with target aiming point (TM-10).

GO TO FRAME 5

Para 3-4 Cont

3-14