SYNCHRONIZATION AND BACKLASH CHECK OF 165 MM GUN WITH
GUNNER'S PERISCOPE M32C-RAMP METHOD (CONT)
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
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.
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