Humminbird PIRANHA 3, PIRANHA 4 INSTALLATION
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Two components need to be installed on the boat: the transducer
and the control head. The control head displays sonar information, the transducer sends and receives sonar signals into the
water. Proper installation of each insures best performance of the
Piranha and provides the greatest enjoyment and functionality.
Due to the wide variety of boats only general instructions
are presented in this installation guide. Each boat has
unique characteristics that need to be evaluated.
INSTALLING THE TRANSDUCER
STEP 1: DETERMINE TRANSDUCER LOCATION
Consider the following to find the best location on the transom:
Choose an area free of turbulent water.
• Turbulence is generated as the boat moves through the
water and is confined to area aft of ribs, strakes and
rivet lines on the bottom of hull. Choose a location on
the transom where the hull forward of this location is
smooth, flat and free of protrusions or ribs.
•Turbulence is also created by the prop - try to keep at
least 380mm (15") from the prop(s).
• The best method to locate areas free of turbulence is
to watch the transom while the boat is moving. For best
high-speed performance this is recommended. Have
an assistant pilot the boat and use caution!
• Stepped hulls require the transducer be mounted on
the step if possible. Never mount the transducer on the
transom behind the step.
• If propellers are forward of the transom, clear water
may be impossible to find. A different transducer or
mounting method should be considered, (see optional
inside hull instructions below).
• The mounting area must be in contact with the water
when the boat is on plane.
• If the boat is trailered, make sure that the transducer is
not inline with trailer bunks or roller assembles that
could damage the transducer during loading
operations.
STEP 2: FOR TRANSOM MOUNTING: DRILL THE
MOUNTING HOLES
1. Remove the mounting template from the last page of
Operation Section (Page O-15).This template provides
a means of locating the two mounting holes which
must be drilled.
2. Hold the template on the transom of the boat in the
location where the transducer will be installed. Align
the template vertically with the inside arrow of the
template on the deadrise where the bottom of the hull
meets the transom wall. (Figure 3 ).
3. Using a pencil or punch, mark the location of the two
mounting holes on the transom.
4. Using a 4mm (
⁵⁄₃₂") bit, drill the two holes to a depth of
approximately 25mm (1"). On fiberglass hulls, it is best
to start with a smaller bit and use progressively larger
drill bits to reduce the chance of chipping or flaking the
outer coating.
PIRANHA 3 & 4 INSTALL GUIDE
You will need: Hand drill and various bits, Phillips #2 & 3
drivers, pencil, silicone sealant (for drilled holes), 2-part,
slow cure epoxy for inside hull transducer mounting, 12v
DC power supply, 1 ampere fuse.
15" 15"
Figure 1. Mounting locations include transom and inside hull.
Turbulence
Figure 2, Location of turbulence
DO NOT LET DEADRISE
INTERSECT THIS LINE
PLACE EITHER CORNER
ON DEADRISE ANGLE
TOP
Use 5/32" drill bit
Drill Drill
PLACE EITHER ARROW
ON DEADRISE ANGLE
TOP
Use 5/32" drill bit
DrillDrill
Level
Figure 3
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STEP 3: ASSEMBLE & MOUNT THE TRANSDUCER
1. Attach the Transducer Body to the Bracket using the
hardware shown below.
2. Tighten the Pivot Bolt just enough so the transducer
can rotate, but remain in a place when released.
3. Apply silicone sealant into the drilled mounting holes.
4. Align the transducer with the mounting holes and
attach with Phillips screws provided.
5. Tighten the Mounting Screws just enough so the
transducer can move vertically, but remain in a place
when released.
Note: A third mounting screw location is provided in the
mounting bracket. Drill and install this ONLY after final
testing and adjustments have been made.
STEP 4: ADJUST THE TRANSDUCER
Correct transducer height and running angle settings are
needed to ensure best performance at all boat speeds.
Use the template provided (pg. O-15) to make the initial
setting for most boats. Some boat hulls require adjustments beyond these settings for best performance at
all speeds.
1. Cut out the transducer templates from the Piranha
package printed template insert following the cutting
directions for your boat hull.
2. Adjust the height on the transom and the pivot bolt
angle to match guides on the template as shown.
3. Hand tighten the Pivot Bolt and Mount Screws at this
time. Ensure the height and angle have not changed.
STEP 5: ROUTE THE CABLE
The cable must be routed to where the control head will
be mounted. Consider the following:
• The easiest method to get the cable into the boat
routes the cable over the transom. The most common
method drills a hole through the transom, above the
water line.
• Once inside the boat, the cable routes through or along
internal conduits and channels.
•Keep the cable as far away as possible from VHF radio
antenna and tachometer cables.
• Do not cut, shorten or lengthen the transducer cable.
• If the cable is too short, extensions are available at
your dealer or direct from Humminbird.
FOLLOW THESE STEPS:
1. Run the cable over the transom or through a 16mm
(
⁵⁄₈") hole drilled well above the water line.
2. If a hole was drilled, fill it with silicone sealant.
3. Secure the cable with clamps as shown. (Figure 6).
INSTALLING THE CONTROL HEAD
STEP 1: ASSEMBLE THE BASE
1. Insert the Mount Arms through the Base.
2. Secure the Mount Arms with the 4 screws provided.
Figure 4
Mounting Bracket
Star lock washers
Pivot
Nut
Cable
Pivot Bolt
¹⁄₄
-20, #3 Phillips Drive
Transducer
Place on bottom of hull
Align with transom.
Cut and use for Fiberglass Hulls
Fiberglass
Aluminum
Transducer
Guide
Transducer bottom
Hull
Cut and use for Aluminum
Hulls
30mm
15mm
Figure 5
Templates supplied locating the transom bracket and
adjusting the transducer’s position.
Transducer
150mm
6"
Figure 6
Note: Allow enough
slack in the cable for
the transducer to
pivot. Route the
cable to side of
the transducer.
Cable Clamps
Right Arm
Arm Screws,4 #6 x ⁷⁄₁₆"
Left Arm
Figure 7
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