Type of Boat
•
Single drive
—Mount a minimum of 15cm (6") beyond the
swing radius of the propeller (see Figure 1).
•
Twin drive
—Mount outside the drives a minimum of 15cm (6")
beyond the swing radius of the propeller.
•
Trim tabs
—Mount inside the trim tab, space permitting.
•
Drive extension
—Mount as far to the side as is practical.
•
Swim platform
—If the platform interferes with the movement of
the transducer, make a cutout to accommodate the transducer
and/or shorten the support tube.
•
Stepped transom
—Mount the transducer on the transom
above the step. Use a straight edge to position the underside of
the transducer even with the underside of the transom (see
Figure 3).
Shortening the Support Tube
WARNING
: The upper latch pin must be inserted through the
topmost
holes of the support tube for the transducer to release.
Failure to pin the support tube through the topmost holes can
result in damage to the bracket if it releases.
If the transducer assembly is too high for the selected mounting
location, the support tube
must
be shortened.
1. Remove the upper latch pin. Slide the support tube out of the
bracket (see Figure 4).
2. The support tube can be shortened in 25mm (1") increments up
to a maximum of 28cm (11"). Determine the amount to be
shortened from the
top
of the tube. Draw a line against the bot-
tom edge of the chosen hole
plumb
with the row of holes.
Do
not cut the bottom of the support tube
(see Figure 5).
Warning
: Always wear safety goggles and a dust mask.
3. Cut the
top
of the support tube to the desired length.
4. File and sand the cut edge to remove sharp edges and burrs.
5. Replace the support tube in the bracket. Secure it by sliding the
upper latch pin through the
topmost
adjustment holes (see
Figure 4).
The upper latch pin must be inserted through the
topmost holes of the support tube for the transducer to release.
Installation
Caution
: Never pull, carry, or hold the transducer by the cable as
this may sever internal connections.
Assembling and Positioning
1. Thread the cable through the support tube (see Figure 4).
2. Using the 3 hex socket cap screws and a 3/8" wrench, attach
the transducer to the mounting shoe.
Do not tighten the center
screw at this time
. The transducer angle will be adjusted later.
3. With the transducer in the “down” position, hold the transducer
assembly at the selected location on the transom. Locate the
bottom of the transducer about 0–3cm (0–1/8") below the
bottom edge of the transom (see Figure 1).
4. Depending on the angle of your transom, the bracket may need
a shim(s) for the transducer to clear the transom when it is
raised and lowered (see Figure 4). Check for clearances with
the transducer in the “up”, “down”, and “released” positions (see
Figure 2). Experiment with the shim(s) provided until there is
sufficient clearance while maintaining the transducer face
parallel to the water surface. When you are satisfied with the
mounting location, use a pencil to draw the outline of the
mounting plate on the transom (see Figure 6).
Note: The bracket is factory pre-set to provide a vertical travel of
77mm (3") between the “up” and “down” positions. The vertical
travel can be adjusted by moving the
lower
latch pin to another
set of adjustment holes.
Figure 3. Stepped transom
Figure 6. Mounting plate and screw locations
correct
incorrect
hull
screw
reinforcement
bolt hole (2)
Figure 4. TM256 assembly
upper latch pin
bracket
latch release line
latch lever
lower latch pin
transducer
hoist line
hinge pin
safety ring
mounting plate
support tube
mounting shoe
adjustment hole
cable
location (4)
Figure 5. Shorten support tube
immediately
below a hole,
plumb with the
row of holes
shim (2)
do not
cut
bottom (with
small holes)
(17 pairs)
cut top only,
screw recess (2)
2
Mounting
1. Separate the mounting plate from the bracket by removing one
safety ring and withdrawing the hinge pin (see Figure 4).
2. Position the mounting plate on the transom over the pencil
outline with the shim(s) in place. (To hold the shim(s) in place,
tape it to the bracket.)
Be sure
the bracket is plumb with the
waterline (see Figure 6).
Warning
: Always wear safety goggles and a dust mask.
3. Using a 4mm, #23 or 9/64" bit, drill four holes, 30mm (1-1/4")
deep, at the selected location.
Be sure
the drill is oriented
parallel to the keel and at right angles to the transom. Drill
through any shim(s).
Do not drill the holes for the
reinforcement bolts at this time
.