600-1152A 14
3.11.1 Inspection
The proper adjustment of the anti-rotation screws can be verified by watching the rod
end of the jack during jack extension, such as during a tracking step. If the rod end
rotates more than 5 degrees at the start of a step, the setscrews should be adjusted by
the following procedure.
Figure 2. Anti-Rotation Setscrew Location
3.11.2 Adjustment
a. Examine the rod end near the pin. If tapped holes are visible, check each hole for a
setscrew.
b. If no tapped holes are visible, remove the retaining ring and washer from one side of
the pin. If no setscrews are found, replace the washer and retaining ring. Remove
the retaining ring and washer from the other side.
c. Remove the setscrews from each hole.
Note: On some sizes of antennas there may be a "jam" screw on top of the
adjusting screw. Both must be removed.
d. If the setscrews are damaged, replace them with new setscrews.
e. Adjust each screw such that it just contacts the washer inside the joint.
f. Replace the jam screws, washer and retaining ring.
g. Extend or retract the jack and observe the joint.
h. If the rotation is still excessive tighten the setscrews ½ turn. Repeat Steps "g & h"
until the rotation is less than 5 degrees.
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