Humminbird 1157c Combo Installating And Operation Manual page 45

Locking Down the Transducer (Optional)
NOTE: You have the option to lock down the Two Piece Kick Up bracket if you do not want the transducer to kick
up. Please be aware, however, that the transducer can be damaged if it is locked down and it strikes debris in
the water.
Marking the Fourth Drill Hole
for Optional Lock Down
Fourth Hole
Mark Initial Drill Holes
Fully Tighten All Three
Mounting Screws
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.
Third Hole
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!
Snap the pivot back down. Install #8 x 1" wood screw into the 4th
4.
hole to lock down the pivot arm.
35
Hand-tighten only!