Humminbird ONIX8 Installation Manual page 25

3
| Finalize the Transducer Installation
Once you have reached a consistently good sonar signal at the desired speeds, you are ready
to lock down the transducer settings.
DualBeam PLUS Transducer
1. Force the pivot to the Up position to gain access to the mounting screws, then re-align
the mounting bracket against the transom of the boat to match the traced silhouette.
Check the bracket position with the level again to make sure it is still level, then mark
the third mounting hole using a pencil or marker. Unscrew and remove the mounting
screws and the transducer assembly and set aside.
2. Drill the third mounting hole, using a 5/32" drill bit. Use a marine-grade silicone sealant
to fill all three drilled mounting holes, especially if the holes penetrated the transom
wall.
NOTE: On fiberglass hulls, it is best to use progressively larger drill bits to reduce the
chance of chipping or flaking the outer coating.
3. Re-position the transducer assembly against the transom of the boat, then hand-
install all three screws. Make sure that the transducer location and the pivot angle have
not changed, then fully tighten all three mounting screws. Hand-tighten only!
4. Snap the pivot back down. If you have performed the preceding procedures correctly,
the transducer should be level and at the right height for optimal operation.
Lock Down the DualBeam PLUS Transducer (optional)
The following procedures are for the DualBeam PLUS transom mount transducer only.
NOTE: You have the option to lock down the Two Piece Kick-Up bracket if you do not
want the transducer to kick up. Be aware, however, that the transducer can be damaged
if it is locked down and it strikes debris in the water.
1. To lock down the transducer, trace the position of the mounting bracket. Force the pivot
to the Up position to gain access to the mounting screws, then re-align the mounting
bracket against the transom of the boat to match the traced silhouette. Check the
bracket position with the level again to make sure it is still level, then mark the fourth
mounting hole using a pencil or marker. Unscrew and remove the mounting screws and
the transducer assembly and set aside.
2. Drill the fourth mounting hole, using a 9/64" drill bit. Use a marine-grade silicone
sealant to fill all four drilled mounting holes, especially if the holes penetrate the
transom wall.
3. Re-position the transducer assembly against the transom of the boat, then hand install
the first three screws (two on the outside edges and one in the 3rd mounting hole).
Make sure that the transducer location and the pivot angle have not changed, then
fully tighten all three mounting screws. Hand-tighten only!
4. Snap the pivot back down. Install the #8 x 1" wood screw into the 4th hole to lock down
the pivot arm. Hand-tighten only!
Side Imaging Transducer
1. Once you have reached a consistently good sonar signal at the desired speeds, fully
tighten your assembly to lock it into place.
21
Drilling the Third Mounting Hole
4th mounting hole
3rd mounting hole
Fully Tightening All Three
Mounting Screws
Locking Down the 200/83 kHz
Transducer (optional)
Locking Down the 200/50 kHz
Transducer (optional)
Test and Finish the Installation