Humminbird PiranhaMAX 155 Installation And Operation Manual page 21

A 4 level grayscale 128h x 160v display, 4" display and dualbeam sonar with 1600 watts ptp power output
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Adjusting the Transducer
Mounting Position
seam aligned with boat hull
Figure 22
Leveling the Mounting
Assembly Horizontally
level
Figure 23
6. Adjust the transducer assembly vertically,
until the seam on the leading edge of the
transducer (the edge closest to the transom
of the boat) is level and just slightly below
the hull (Figure 22).
NOTE: The transducer has a natural downward
slant of 4-5 degrees from leading edge (closest to
the boat transom) to trailing edge (farthest away
from the boat). Looking at the back of the
transducer, the seam should be slightly below
the bottom of the hull.
7. Continue to adjust until the bracket is also
level from port to starboard (horizontally
level as you look at the transducer from
behind the boat [Figure 23]).
8. Mark the correct position on the transom by
tracing the silhouette of the transducer
mounting bracket with a pencil or marker.
9. Tighten the pivot bolt, using the pivot screw
and nut to lock the assembly. Hand tighten
only!
CAUTION! Do not use a high speed driver on
this combination of fasteners. Hand tighten only.
10. Hand tighten the two mounting screws.
NOTE: You will drill the third mounting hole and
finalize the installation after you route the cable
and test and finish the installation in the
following procedures.
13
Transom Transducer Installation

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