Mounting The Transom-Mount Transducer; Fig. 2-8 Transducer Bracket, Side View - Raymarine L750 Operating Handbook

Chapter 2: Installation
Allow a clearance
inches (254 mm)

Fig. 2-8 Transducer Bracket, Side View

Mounting the Transom-Mount Transducer

Follow these instructions if you are installing the transom-mount
transducer.
1. On a boat with a fiberglass hull, the leading edge of the transducer
should extend 1/8" (3.2 mm) to 1/4" (6 mm) below the bottom edge
of the hull. See Fig. 2-9. On an aluminum hull, the transducer
should extend a bit more – 1/4" (6 mm) to 3/8" (9 mm). If the boat will
be operated at high speeds, the transducer may be mounted closer
to the centerline of the hull.
2. The lower surface of the transducer should tilt down toward the rear
at a slight angle (2° to 5°). The mounting bracket includes a wedge.
Depending on the angle of the transom on your boat, you may need
this wedge to get the correct angle for the bottom of the transducer.
3. Looking at the rear of the boat, be sure the bracket is vertical
(perpendicular to the water line).
4. Hold the bracket (and the wedge, if used) against the transom and
trace the positions of the screw slots.
5. Remove the bracket. See Fig. 2-10. The screws in the outer slots
should be placed about 1/4" (6 mm) up from the bottom of each slot.
The screw in the center slot should be placed 1/4" (6 mm) down from
the top. (This will allow you to adjust the bracket up or down a bit.)
Drill pilot holes 3/4" (19 mm) deep. Use a 9/64" (3.5 mm) drill bit. To
prevent drilling too deeply, wrap masking tape around the drill bit
about 7/8" (22 mm) from the tip. Drill in only as far as the tape
marker.
If you are attaching the bracket to a fiberglass hull, you can minimize
any surface cracking of the gel coat. Before drilling each pilot hole,
drill a shallow hole (chamfer) at each location about 1/16" (1.5 mm)
deep. Use a 1/4" (6 mm) drill bit.
of at least 10
10"
(254 mm)
Transducer in
released position
13