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Service Manual
Third edition, June 1997
6.5 Dismounting of Antenna Feeder of the Parabolic Antenna
The antenna feeder is mounted in the centre of the trunk and
its upper part is engaged in the Electronic Box. Replacement
can be carried out when the system is operating.
Important!
When removing the antenna feeder the tank must be opened. Per-
mission from officer in charge must be obtained before the service
work commences.
6.5.1 Disassembly
1. Begin by removing the Electronic Box according to
chapter 6.1.
2. Note the exact position of the adjustment scales. Take a
reading of both FORE and SB (starboard) scale positions
over the clamp ring edge.
3. Remove the adjustment scales assembly from the an-
tenna feeder.
4. Loosen and remove the eight nuts securing the clamp
ring.
5. Remove the clamp ring by lifting it straight up.
6. Lift the antenna feeder straight up and remove it, but
leave the gasket in its original place. If the gasket is
damaged it must be replaced with a new one.
6.5.2 Reassembly:
1. Insert the antenna feeder in the socket. Make sure the
wings of the antenna feeder point to the cleaning hatch
plane, thus allowing brush cleaning of the Teflon plug
on antenna feeder through the cleaning hatch.
2. Mount the clamp ring. Apply molybdenum sulphide
paste on threads. Mount the nuts loosely, but do not
tighten.
3. Install the adjustment scales assembly, and adjust the
FORE scale pointing forward and the SB scale pointing
starboard.
4. Adjust the antenna feeder in its original position using
the adjustment scales.
5. The clamp ring nuts are tightened to different torques
depending on which type (color) of gasket is used
under the clamp ring. Tighten the nuts to the following
torque:
• Brown gylon gasket = 75 Nm
• Blue gylon gasket = 45 Nm
• White gylon gasket = 75 Nm
Tighten the clamp ring nuts in a uniform, crosswise
NOTE !
- +
- +
FORE
SB
Figure 6-7.
Figure 6-8.
Figure 6-9.
- +
- +
FORE
SB
Figure 6-10.