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Transducer mounting
The mounting procedure below should be read thoroughly before attempting to mount the
transducer.
Important:
• The RV-4xx series transducers are recommended for vessels with metal hulls. When installing,
ensure that the transducer is isolated from the metal hull using ALL of the supplied isolator parts.
• Do NOT install stainless steel transducers on vessels with a positive ground system.
Important:
• Only perform the installation with your vessel out of the water.
• Do NOT lift or suspend the transducer using its cable.
• Ensure that the transducer body is supported during installation.
• Do NOT remove the label attached to the transducer cable; as it helps to ensure correct
connection.
• Do NOT overtighten the hull nut or anti-rotation bolt. Overtightening can cause damage to the
hull which may result in water leaking into the vessel.
Drilling holes in the hull
To install a Thru-hull transducer you must drill holes in the hull of your vessel for the transducer
stem and anti-rotation bolt.
1. Ensure that you are using the correct transducer (i.e.: port / starboard, 0°, 12° or 20° tilted element)
for your chosen mounting location.
2. Using self-adhesive tape, attach the supplied mounting template to your chosen mounting
location. Ensure that the 'Bow' arrow on the template is pointed towards the vessel's bow and
that the template is flat and not creased.
3. Mark the hole centers for the transducer stem and anti-rotation bolt holes on the hull by piercing
through the template and using a pencil or marker.
4. Remove the template from the hull.
5. Drill a pilot hole for the transducer stem hole.
6. Drill a 70 mm (2
3
/
inch) hole for the transducer stem, using a hole cutter.
4
Important:
(1) If the specified size hole cutter is not available, use a slightly smaller size hole cutter and then
carefully file the hole to the correct size. Alternatively you could use a jigsaw to cut the hole and
then carefully file the edge to create a circle the required size.
7. Using a half round file and / or sandpaper, ensure there are no rough edges or burrs around
the transducer stem hole.
8. Guide the transducer cable and then the transducer stem up through the transducer stem hole
and support from beneath.
9. Ensure that the anti-rotation bolt hole is lined up with the mark you made on the hull and that the
transducer is parallel to the centerline of the vessel.
(1)
5
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