Humminbird PiranhaMAX 155 Installation And Operation Manual page 19

NOTE: It is important to take your measurement in the location shown in
Figure 16, from exactly 12 inches down from the top of the transom.
2. Place the two ratchets, one on either side of the transducer knuckle, so
that the beads on each ratchet line up with the desired position number
on the knuckle (Figure 17a). If you are setting the ratchets at position 1,
the beads on each ratchet will line up with the rib on the transducer
knuckle to form one continuous line on the assembly (Figure 17b).
NOTE: The ratchets are keyed. Make sure that the square teeth on each
ratchet face the square teeth on the transducer knuckle, and the triangular
teeth face outward.
Hold the ratchets on the transducer knuckle with one hand and fit the
mounting bracket over them until it snaps into place with the other hand. Refer
to the illustration (Figure 17d).
Transducer Knuckle Positions
Ratchets Placed in Position 2
rib
knuckle
rib at
position 1
Figure 17a
Fitting the Mounting Bracket Over the Ratchet
bead
ratchet
Figure 17c
11
Ratchets Placed in Position 1
Transom Transducer Installation
beads
ratchet
Figure 17b
Figure 17d