Installation
Attaching the Transducer to the Bracket
1. Insert the transducer’s pivot posts into the slots in the back of the
bracket (see Figure 3).
2. With the screw holes aligned, rotate the transducer until it
snaps onto the bracket.
Marking and Hole Drilling
1. At the selected location on the starboard side of the hull, position
the sensor, so the bottom left corner of the transducer projects
3mm (1/8") below the bottom edge of the transom (see Figure 4).
2.
Be sure the bottom of the transducer is parallel to the waterline.
Using a pencil, trace the bottom of the bracket and both corners
onto the hull.
3. Remove the transducer and hold the shim against the outline
you have drawn. Mark an “X” in the center of each slot for the
screw holes.
Warning
: Always wear safety goggles and a dust mask.
4. Using a 4mm, #23, or 9/64" drill bit, drill two holes 22mm (7/8")
deep at the locations indicated. To prevent drilling too deeply,
wrap masking tape around the bit 22mm (7/8") from the point.
Fiberglass hull
—Minimize surface cracking by chamfering the
gelcoat. If a chamfer bit or countersink bit is not available, start
drilling with a 6mm or 1/4" bit to a depth of 1mm (1/16").
Plastic Shim
•
Standard transom
(13° transom angle)—The bracket is
designed for a standard 13° transom angle. The shim is not
needed for this installation. Skip to “Mounting the Bracket”.
•
Stepped transom and jet boats
(3° transom angle) —Use the
shim with the tapered end
down
. Place the nuts in the slots in
the back of the bracket (see Figure 5). Snap the shim into place.
•
Small aluminum and fiberglass boats
(20° transom angle)—Use
the shim with the tapered end
up
(see Figure 5). Place the nuts in
the slots in the back of the bracket. Snap the shim into place.
• If you are unsure about using the shim,
do one of the following:
• Measure the transom angle of your boat using a digital level
or bubble level and protractor. Then follow the instructions
above for your transom angle.
• Experiment with the shim by following the instructions
“Mounting the Bracket” and “Checking the Transducer Angle
and Projection”.
Mounting the Bracket
1. Insert the two nuts in the slots in the back of the bracket if this
has not been done (see Figure 5).
2. Apply marine sealant to the threads of the two, #10 x 1-3/4",
self-tapping screws to prevent water seepage into the transom.
3. Screw the bracket (with the shim if needed) to the hull.
Do not tighten the screws at this time.
Checking the Transducer Angle and Projection
Caution
: Do not position the bow of the sensor lower than the
stern because aeration will occur.
Caution:
Do not position the sensor farther into the water than
necessary to avoid increasing drag, spray, and water noise and
reducing boat speed.
1. Using a straight edge, sight the underside of the sensor relative
to the underside of the hull (see Figure 6). The stern of the
sensor should be 1–3mm (1/16–1/8") below the bow of the
sensor or parallel to the bottom of the hull.
2. Using the vertical adjustment space in the bracket slots, slide
the sensor up or down (see Figure 4).
Be sure
the bottom left
corner of the sensor projections 3mm (1/8") below the bottom
of the hull.
3. When you are satisfied with the position of the sensor,
tighten
the bracket screws
.
2
Figure 3. Mounting the transducer on the bracket
pivot post (2)
slot (2)
bracket
transducer
Figure 5. Mounting the bracket—shim for 20• transom angle
Figure 4. Vertical adjustment and cable routing
50mm (2")
cable cover
Hull projection
3mm (1/8")
parallel to
cable clamp
detail
of shim
shim
nut
slot
screws
(#10 x 1-3/4"
self-tapping)
transducer
waterline
bracket
screw
cable
screw
(tapered
end up)
actual size
actual size
