Airmar 1 kW—TM258 Long Bracket User Manual download pdf (Page 2)

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 (see Figure 3). Use a straight edge to position the

underside of the transducer even with the underside of the transom.

Shortening the Support Tube

Caution

: The bracket must be able to release if the transducer is

struck by an object. Failure to release may cause damage to the hull.

Caution

: 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

bottom edge of the chosen hole

plumb

with the row of holes

(see Figure 5).

Do not cut the bottom of the support tube

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 (see Figure 4). Secure it

by sliding the upper latch pin through the

TOPMOST

adjustment

holes.

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 & 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 0–3mm (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) so the transducer clears 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’s face parallel to the

water surface. (To help hold the shim(s) in place, bosses on the

shim(s) mate with the holes in the mounting plate.) 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 preset 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

hull

Figure 5. Shorten support tube

- immediately

below a hole

- plumb with the

row of holes

Do not cut bottom

(with small hole)

- cut top only

Figure 4. 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

shim (2)

(17 pairs)

screw recess (2)

Figure 6. Mounting plate and screw locations

correct incorrect

screw

reinforcement

bolt hole (2)

location (4)

Mounting

Caution

: The stainless steel bracket must be isolated from a

metal hull to prevent electrolytic corrosion. Use non-metal

insulating washers between the bracket and a metal hull.

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 (see Figure 6).

Be sure

the

bracket is plumb with the waterline. (To hold the shim(s) in

place, mate the bosses on the shim(s) with the holes in the

mounting plate and tape them together.)

hole (2)

mates with

bosses on shim

1 2 3 4

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Airmar 1 kW—TM258 Long Bracket User Manual Page 2

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