Eagle Electronics FISHEASY 245DS - Manual (Page 19)

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If you need to drill a hole in the transom to pass the connector through,
the required hole size is 5/8". (If you intend to route an additional speed
or temp sensor cable through the same hole, you will need a 1" (25.4
mm) drill bit instead.)
Caution:
If you drill a hole in the transom for the cable, make sure it is
located above the waterline. After installation, be sure to seal the
hole with the same marine grade above- or below-waterline seal-
ant used for the mounting screws.
7. Make a test run to determine the results. If the bottom is lost at
high speed, or if noise appears on the display, try sliding the trans-
ducer bracket down. This puts the transducer deeper into the water,
hopefully below the turbulence causing the noise. Don't allow the
transducer bracket to go below the bottom of the hull!
Trolling Motor Bracket Installation
1. Attach the optional TMB-S bracket to the transducer as shown in the
following figure, using the hardware supplied with the transducer.
(Note: The internal tooth washer is supplied with the TMB-S.)
Attach motor mounting bracket to transducer.
2. Slide the adjustable strap supplied with the TMB-S through the slot
in the transducer bracket and wrap it around the trolling motor.
TMB-S bracket
Bolt
Internal tooth washer
Nut
Flat washer