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TRANSOM TRANSDUCER Installation Guide
The transom mount installation allows adjustment of both running angle and depth after the
transducer is mounted, which enables you to tune the installation for best results.
NOTE: Due to the wide variety of hulls, only general instructions are presented in this installation
guide. Each boat hull represents a unique set of requirements that should be evaluated prior to
installation. For detailed information about installing transducers on different hull types,
download the Transducer Installation Resource Guide from our Web site at humminbird.com.
NOTE: Your transducer may not look exactly like the transducer shown in the illustrations, but it
will mount in exactly the same way.
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Install the control head before you start the transducer installation. See the control head
installation guide.
Review your boat manufacturer’s owner’s manual for recommended transducer installation
locations and cable routing methods. You will also need your transom angle.
Read and understand your boat’s warranty before starting this installation.
Read the instructions in this guide completely and understand the mounting guidelines
before beginning this installation.
Visit our Web site at humminbird.com for additional information and resources for transducer
installations. Also, visit youtube.com/humminbirdtv for informational videos.
Confirm your boat is level for the installation.
Consider your speed requirements.
Traveling over 65 mph with the transducer in the water is not recommended with the XNT 9
SI 180 T, XNT 9 DB 74 T, XNT 14 74 T, and XNT 9 MSI 150 T transducers, as damage may occur.
If speed above 65 mph is critical, see the FAQ (Frequently Asked Questions) section of our Web
site at humminbird.com.
Down Imaging® provides the maximum detail at slower speeds, however, high-speed
performance is available in the Down Imaging and traditional sonar views. If high-speed
operation is critical with your Down Imaging transducer, you may want to consider an Inside
the Hull transducer.
SIDE IMAGING® NOTE: The Side Imaging transducer CANNOT be installed inside the hull of
the boat.
Supplies: In addition to the supplied hardware, you will need a powered hand drill and various
drill bits, various hand tools, including a ruler or straightedge, a level, a socket driver, marker
or pencil, safety glasses and dust mask, marine-grade silicone sealant, dielectric grease
(optional), and a 12" plumb line (weighted string or monofilament line [optional]). You may
also need extension cables and hardware for routing the cable to the control head.
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