Manual Humminbird PiranhaMax 170 (page 25 of 52) (English)

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NOTE: It is often necessary to make several incremental transducer adjustments

before optimum high speed performance is achieved. Due to the wide variety of boat

hulls, however, it is not always possible to obtain high speed depth readings.

6. Once you have reached a consistently good sonar signal at the desired

speeds, you are ready to lock down the transducer settings. Remove the

transducer from the bracket (after noting where the ratchets are

assembled), 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 bracket and set aside.

7. 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.

8. Re-position the transducer bracket against

the transom of the boat, then hand-install

all three screws. Make sure that the

transducer location has not changed, then

fully tighten all three mounting screws

(Figure 27). Hand tighten only! Re-install

the transducer to the mounting bracket,

making sure to assemble the ratchets in the

same location they had before. (See Figures

18a - 18d and Figure 21 - 22). If you have

performed the preceding procedures

correctly, the transducer should be level

and at the right height for optimal operation.

Fully Tighten All Three

Mounting Screws

Figure 27

Transom Transducer Installation

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Humminbird PiranhaMax 170 Manual

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