Comtech EF Data CST-5000 - Manual (Page 70)

Redundant System Installation CST-5000 C-Band Satellite Terminal
3–16 Rev. 9
3. Install the 20 inch (51 cm) unistruts as follows:
a. Position a spring nut between the 1/4-20 bolts in each 8 inch (20.3 cm)
unistrut, as illustrated below:
b. Install each spring nut as follows:
(1) Place the spring nut in the unistrut channel, spring side down, with its
wide side parallel with the unistrut channel.
(2) Press down on the spring nut to compress the spring, and rotate the nut
90 ° (i.e., perpendicular to the unistrut).
(3) Release pressure on the spring nut.
(4) Repeat Steps 3.b.(1) through 3.b.(3) for each spring nut.
c. With the RFTs side by side, position a 20 inch (51 cm) unistrut in place over
one pair of 8 inch (20.3 cm) unistruts (open side up).
d. Using four 5/16-18 bolts, 5/16 inch (8 mm) split lockwashers, and 5/16 inch
(8 mm) flat washers, bolt the 20 inch (51 cm) unistrut to the 8 inch (20.3 cm)
unistruts.
e. Tighten the bolts firmly.
f. Repeat Steps 3.c. through 3.e. for the second 20 inch (51 cm) unistrut.