FRAME 1

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

3-4.

SYNCHRONIZATION AND BACKLASH CHECK OF 165 MM GUN WITH

GUNNER'S PERISCOPE M32C-RAMP METHOD (CONT)

FRAME 1

Procedure

Step

Have driver position tank on comparatively level ground, with rear of tank toward a

ramp or hill (view A).

NOTE

The ramp or hill should have enough grade to allow

later positioning of the tank to about 267 mils from

horizontal. The ramp or hill should also be located

about 600 meters from a suitable target such as a

straight line of trees, a building, or a post. An imaginary

line from the line-of-sight of the gun to the target should

be near horizontal to avoid a large gun elevation angle

when the tank is later positioned on the ramp or hill.

Place black thread (1) over witness lines on muzzle of gun tube to form a cross. Attach

thread with tape or strap (2).

Using gunner's periscope, select a target with clearly defined right angles as near 600

meters as possible (view B). (Range, if possible, should be surveyed.)

Depress main gun with manual elevation hand pump and continue pumping until it is

hard to turn (TM-10).

Perform calibration of Gunner's Qutadrant M1A1 (TM 9-1290-200-14&P).

Check gunner's periscope daylight reticle for parallax (para 3-5).

GO TO FRAME 2

Para 3-4 Cont

3-11