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|  MIL-T-62222(AT)
4.6.17.3.4.14 Hydraulic fluid.
4.6.17.3.4.14.1 Hydraulic fluid cleanliness. To determine conformance to 3.5.3.4.14.1, the
hydraulic oil in the control power pack shall be tested for water contamination and cleanliness
requirements
4.6.17.3.4.14.2 Hydraulic fluid leakage. To determine conformance to 3.5.4.3.14.2, during
and after road tests, the vehicle shall be examined for leakage in the turret and gun control
hydraulic system not to exceed the amount specified.
4.6.17.3.4.15 Elevation shut off valve. To determine conformance to 3.5.3.4.15, with the
gunner's power switch on, without actuating the palm switch, the gunner's control handle shall
be tilted forward and backward to its stops and the gun observed for movement of not more than
2 mils.
4.6.17.3.5 Cupola control.
4.6.17.3.5.1 Traverse effort. To determine conformance to 3.5.3.5.1, a torque gage shall be
attached to the cupola traverse mechanism and the torque measured to start cupola motion.
Breakaway torque to start motion shall be as specified.
4.6.17.3.6 Fire control system. To determine conformance to gun fire control system
requirements of 3.5.3.6.1.1 through 3.5.3.6.1.5, tests shall be performed as specified. With the
exception of sighting system boresight retention and rangefinder calibration, these tests may be
conducted on an indoor turret stand using equipement indicated herein. The portion of the
vehicle tested using this method shall be the turret and other installation as assembled just prior
to marriage to the hull and tracked portion of the vehicle. Turret voltage shall be a nominal
26 V dc.
4.6.17.3.6.1 Main gun sighting system.
4.6.17.3.6.1.1 Synchronization. To determine conformance to 3.6.3.6.1.1, testing shall be
conducted in accordance with the following procedure: (See figures 6 through 10 for fire control
location positions and target aiming points.)
a. The turret shall be mounted on a stand so that the turret datum surface is level within
0.2 mil.
b. Target or aiming points, as shown in figure 8, shall be mounted on a target stand.
Details of targets shall be as shown in figure 9. Targets shall be in a common plane
within 1/16 inch. This plane shall be vertical within 0.5 mil and shall be located
523.5 inches plus or minus .125 inch from the centerline of the turret mounting
diameter. A vertical plane perpendicular to the target plane and intersecting the zero
gun aiming point shall intersect the centerline of the turret mounting diameter of the
turret stand within 1/4 inch.
c. The gun tube shall be leveled from low to high.
49
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