Transom Transducer Installation - Humminbird ] 981 Installation & Operation Manual

98x_Manual_531376-1_A.qxd 2/23/2005
NOTE: Rough seas also can affect the readings of the Side Imaging transducer.
NOTE: The transducer must be mounted at least 15" from the propeller to avoid interference
from the motor.
NOTE: If the included transducer will not work for your application, you may exchange it,
NEW and UNASSEMBLED, with mounting hardware included, for a transducer appropriate
for your application - often at very little or no charge depending on the transducer. Call the
Humminbird® Customer Resource Center (1-800-633-1468) for details and pricing, or visit
www.humminbird.com,Product Support/Transducer Exchange for more information.
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. In addition to the parts supplied, you will need a hand drill
with various bits, a socket wrench (5/16" or 8 mm) a Phillips head screwdriver, and marine-
grade silicone sealant.
NOTE: When drilling holes in fiberglass hulls, it is best to start with a smaller bit and use
progressively larger drill bits to reduce the chance of chipping or flaking the outer coating.
Fill all holes with marine grade silicone sealant.
WARNING: Do not touch an active transducer during operation, as this may cause physical
discomfort and may result in personal injury in the form of tissue damage. Handle the
transducer only when the power to the control head is off.
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TRANSOM TRANSDUCER INSTALLATION

If you will be installing a transom mounted transducer, use the procedures in this
section. There are two pieces to the transducer mount assembly: the pivot, and the
bracket. Your transducer comes with a two-piece metal and plastic bracket assembly.
There are several procedures you will have to perform in order to install a transom-
mounted transducer. They are:
• Determine transducer mounting location
• Mount the bracket to the boat
• Attach the pivot to the transducer
• Mount the transducer pivot assembly to the bracket
• Adjust the running position of the transducer
• Route the transducer cable
• Perform a final test of the transom transducer installation.
1
1 2
Rivets/Strakes Deadrise Angle
To determine transducer mounting location:
NOTE: If transom mounting is not possible because of a stepped hull or cavitation noise,
trolling motor installation may be an option. See Trolling Motor Transducer Installation for
more information.
12
Stepped Hull
3
2
3
Step