Humminbird XNT 9 20 Installation Manual page 3

TRANSDUCER Installation Guide
NOTE FOR 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 fiberglass coating.
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| Assemble the Transducer and Initial Mounting
You will initially assemble the transducer and the mounting bracket (using the hardware provided)
by matching the two ratchets to a numbered position on the transducer knuckle, then mount it and
make adjustments to its position without locking it in place.
1a. If your transom is angled at 14 degrees (a common transom angle for many boats), use
position 1 for the ratchets.
1b. If you have a different transom angle or do not know your transom angle, refer to the
Transducer Installation Resource Guide on our Web site at humminbird.com for detailed
instructions.
2. Place the two ratchets, one on either side of the transducer knuckle, so that the beads on each
ratchet line up with the desired position number on the knuckle (see Installing the Ratchets in
Position 1). If you are setting the ratchets at position 1, the beads on each ratchet will line up
with the rib on the transducer knuckle to form one continuous line on the assembly.
NOTE: The ratchets are keyed. Make sure that the square teeth on each ratchet face the square
teeth on the transducer knuckle, and the triangular teeth face outward.
3. Hold the ratchets on the transducer knuckle with one hand and fit the mounting bracket over
them until it snaps into place with the other hand. Refer to the illustration Fitting the Mounting
Bracket Over the Ratchet.
4. Put the pivot bolt through the assembly to hold it in position and loosely install the nut, but do
NOT tighten the nut at this time (see Installing the Pivot Bolt).
CAUTION! Do not use a high speed driver on this combination of fasteners. Hand-tighten only.
5. Align the mounting bracket transducer assembly with the drilled holes in the transom. With a
5/16" (8 mm) socket driver, mount the assembly to the transom using the two #10 - 1" (25.4
mm) long screws provided. Hand-tighten only!
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.
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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
(the edge closest to the transom of the boat) 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.
532310-3_A
Installing the Ratchets in Position 1
knuckle
ratchet
rib at
position
1
bead
Fitting the Mounting Bracket
Over the Ratchet
Installing the Pivot Bolt
Mounting the Assembly
to the Transom
Adjusting the Transducer
Mounting Position
LEVEL
4
Correctly aligned.
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