ViaSat Series 8345, Installation Manual

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Chapter 2 - Installation
2.11.1 Adjustment of Eccentric Cam Followers
The eccentric cam followers were installed during the assembly procedure to
give maximum clearance between the rollers and the surface of the azimuth
ring. It is now necessary to adjust the eccentric cam followers such that the
clearances between them and the azimuth ring are kept to a minimum. The
following procedure shall be used to accomplish this.
1. Insert an allen wrench in one end of eccentric cam follower and rotate cam until
contact is made with the azimuth ring.
2. Apply a firm grip on the allen wrench and torque the 1-14 nut to 150 ft-lbs (203
Nm).
3. Repeat steps 1 and 2 for all eccentric cam followers.
2.11.2 Installation of Azimuth Actuator
Refer to Figure 2-6 and perform the following procedure to install the
azimuth actuator:
1. Locate the azimuth actuator assembly, two azimuth pivot pins, 1/4-20 x 5/8
screws, and washers.
2. Position the azimuth actuator on the load frame and apply a small amount of
grease to the pivot pins.
CAUTION
Be sure not to damage grease fittings when installing pivot
pins.
3. Install pins through the load frame bores and into the azimuth lead screw
housing.
4. Secure pivot pins using 1/4-inch hardware in six places.
5. Align azimuth clevis with torque arm and bolt in place using 5/8-11 x 2 1/4-inch
bolts, washers, and nuts in four places.
6. Adjust clevis plates in slots so that the torque arm, clevis plates, and azimuth
trunnion is in line at zero azimuth position.
NOTE
The azimuth actuator shall be run ±9
0
° from zero. Adjust clevis plates as required if
binding occurs.
42S199F
2-21