Humminbird 931C Installation And Operation Manual page 17

93x_Man_531370-1_A - vs4.qxd 2/18/2005
To mount the transducer bracket to the boat (Single frequency unit):
1. Remove the transducer mounting template from this manual. See Appendix A
for the Single Frequency Mounting Template.
NOTE: Please make sure that you use the correct drill holes for the hull composition of
your boat.
15" (380 mm)
Level
from prop(s)
3. Using a pencil or punch, mark the two mounting holes (shown on the template
for your type of hull) on the transom. Do not mark or drill any other holes at this
time.
4. Using a 9/64" (3.5 mm) bit, drill the two holes to a depth of approximately
1" (25 mm).
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2. Hold the template on the transom of
the boat in the location where the
transducer will be installed. Align the
template vertically, matching the lower
edge of the transom with the bottom
corner of the template. If your propeller
moves clockwise as the boat moves
forward, mount the transducer on the
starboard side, and use the bottom left
corner of the template. If your propeller
moves counter-clockwise as the boat
moves forward, mount the transducer on
the port side, and use the bottom right
corner of the template.
12
To attach the pivot to the transducer (Single frequency unit):
1. Attach the Two Piece Kick-Up pivot to
the transducer body, using the 1/4" - 20 x
1
1 1/4" Phillips head pivot bolt, the nyloc
nut, and the two toothed lock washers.
2
NOTE: The toothed lock washers must be
6
positioned between the transducer arms
3
and the pivot knuckle regardless of
4
5
mounting bracket type.
2. Using a Phillips screwdriver and a 7/16"
wrench, loosely tighten the pivot bolt. Do
1 Toothed Lock Washer
not completely tighten the assembly at
2 Kick-Up
this time, so that the pivot angle can be
3
Pivot Knuckle
adjusted later.
4
Transducer Arms
5 Pivot Bolt
6 Nyloc Nut
1