Kongsberg Simrad ST90, Reference Manual

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Make sure that you do not damage the delicate parts of the hull unit.
Note
Make sure that you do not damage the transducer or any of the cables. Watch the hull
unit carefully during the lift to prevent the delicate parts from being damaged, stuck or
hooked on to protruding objects.
5 Remove the rubber gasket to protect it.
Note
This gasket must not be damaged.
Mounting the hull unit on top of the installation trunk:
6 Lift the hull unit and place it vertically over the installation trunk.
7 Check the top of the installation trunk.
a Make sure that the surface of the installation trunk is clean and free from grit
or other damaging particles.
b Make sure that the top of the installation trunk has not been damaged, and that it is
smooth and even without physical scratches or dents.
8 Rubber gasket:
a Make sure that the gasket is undamaged without cracks or signs of wear.
b Make sure that the gasket is NOT covered with grease or lubricants.
c Place the gasket at its correct location.
Note
If you suspect that the gasket is damaged, replace it. If the gasket has been
contaminated with dirt, grease or lubricants, it must be replaced.
9 Lower the hull unit carefully onto the installation trunk.
Important
The transducer is covered with a thick red or black protective coating made of a special
plastic type. The protective coating is a vital part of the transducer. It is very important
that neither this coating nor the internal parts of the transducer are damaged during the
handling, installation or cleaning.
10 Align the mounting holes carefully.
11 Mount and tighten the relevant nuts and bolts.
Maintenance procedures