Lowrance electronic HDS 7 User Manual

Sand both the inside surface of the hull, where 

the transducer is to be epoxied, and the face of 

the transducer.

You may want to start with a rougher grit 

sandpaper, such as 60 grit, and finish with a 

smoother grit, such as 160 grit, sandpaper. 

Sand the inside surface of the hull until it is 

smooth to the touch.

The sanded area should be about 1-1/2 times 

the diameter of the transducer. After sanding, 

clean the hull and face of the transducer with 

an alcohol wipe to remove any sandpaper grit 

and dust.

Apply a thin layer of epoxy (about 1-16" or 

1.5 mm) on the face of the transducer and the 

sanded area on the hull. Make sure there are 

no air pockets in the epoxy layers.

Press the transducer into the epoxy, twisting 

and turning it to force any air bubbles out 

from under the transducer face. Stop pressing 

when it bottoms out on the hull.

Apply pressure to hold the transducer in place 

while the epoxy sets. Be careful not to move 

the transducer while the epoxy is setting. 

Allow the epoxy to set before moving the 

boat. 

When finished, the face of the transducer 

should be parallel with the hull with a 

minimum amount of epoxy between the hull 

and transducer. 

On vee hulls try to place the transducer where 

the deadrise is 10° or less.

 After the epoxy has set, route 

the transducer cable to the sonar unit.

  Sand    

 

face of  

 

transducer  

 

and bottom  

 

of hull.

  Apply  

 

epoxy  to  

 

face of  

 

transducer  

 

and bottom  

 

of hull.

   Epoxy transducer to hull.

Hull

Epoxy