Lightning Protection; Rod End Anti-Rotation Screw Adjustment; Table 3. Jack Grease Chart - General Dynamics SATCOM Technologies KX 120 Operation & Maintenance Manual

JACK
APPLICATION
SIZE
35 TON 11M Elevation
75 TON 11M Azimuth
* Each grease fitting
3.10

Lightning Protection

The elevation and azimuth axis bearings are protected by looping ground cables from
reflector to pedestal and from pedestal to perimeter ground.
Lightning rods are provided on the top radial beam and reflector apex.
As an option, "down conductors" can be attached to the lightning rods to serve as down
conductors and are attached to the ground field via a lug on the lower azimuth pintle.
The lightning rods and ground cables must be checked periodically to insure continuity
of conductance (good metal to metal contact) to prevent damage to bearings during
electrical storms.
3.11

Rod End Anti-Rotation Screw Adjustment

The anti-rotation setscrews in the jack rod ends of the antenna should be checked and
adjusted during routine maintenance every three months or as necessary. Each rod end
has two (2) tapped holes in a circular pattern around the pin connecting the jack to the
pedestal or reflector. Each hole contains a setscrew which is adjusted to minimize the
tendency of the jack screw to rotate when the jack is extended or retracted. Figure 2
shows a typical anti-rotation setscrew location.
600-1152A

Table 3. Jack Grease Chart

GREASE CAPACITY
SHOTS
140
70 Oz. or 4# 6 Oz.
SHOTS
400 200 Oz. or 12# 8
SHOTS Oz.
13
*RELUBRICATION
AMOUNT
WEIGHT SHOTS
WEIGHT
10
SHOTS
15
SHOTS
5 Oz.
7.5 Oz.