Humminbird XNT 9 DB 74 T Installation Manual page 4

TRANSOM TRANSDUCER Installation Guide
NOTE: If the pivot assembly is snapped closed over the mounting bracket, use a flat head
screwdriver or similar tool to gently pry the assembly away from the mounting bracket.
6. Align the mounting bracket transducer assembly with the drilled holes in the transom. With a 5/16"
socket driver, mount the assembly to the transom using the two #10 - 1" long screws provided.
NOTE: Make sure that the mounting screws are snug, but do not fully tighten the mounting
screws at this time to allow the transducer assembly to slide for adjustment purposes.
7. Snap the pivot arm down into place.
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| Confirm the Mounting Angle
You will need to adjust the initial angle of the transducer both vertically and horizontally to confirm
the transducer mounting angle.
1. Adjust the transducer assembly vertically, until the seam on the leading edge of the transducer
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(see below) is level and just slightly below the hull.
2. Adjust the initial angle of the transducer from back to front by rotating the transducer until
the side seam on the transducer is almost parallel with the bottom of the boat, one click at a
time in either direction (see Adjusting the Initial Transducer Angle).
Downward Slant: The transducer has a natural downward slant of 4 to 5 degrees from leading edge
(closest to the boat transom) to trailing edge (farthest away from the boat). Looking at the back of
the transducer, the seam should be slightly below the bottom of the hull.
Down Imaging Transducers: A downward slant is not required for Down Imaging Transducers. Adjust
the running angle so that the transducer is parallel to the water and submerged in the water.
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Leading edge (the edge closest to the transom of the boat).
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One click too high: the transducer is tilted out of the water and cannot maintain a sonar signal.
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Trailing edge (the edge farthest away from the boat).
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Correctly aligned: the transducer side seam is parallel with the water line.
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One click too low: the deeper the transducer is in the water, the more likely that a rooster tail of
spray will be generated at high speeds. You also risk the transducer being struck and damaged
by objects in the water, so make sure that the transducer is as high as it can be and still be
submerged in the water.
3. Continue to adjust until the transducer assembly until the bracket is also level from port to
starboard (horizontally level as you look at the transducer from behind the boat) (see Adjusting
the Horizontal Transducer Angle).
Adjusting the Initial Transducer Angle
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532314-3_B
Mounting the Assembly
to the Transom
Adjusting the Transducer
Mounting Position
LEVEL
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Correctly aligned.
Adjusting the Horizontal
Transducer Angle
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