5Fishnder 300C Installation Instructions
Apply marine sealant to all screw
threads to prevent water from
seeping into the transom.
Mount the transducer
cable cover well above
the waterline.
Transducer should extend 1/8" (3.2 mm)
below a berglass hull or 3/8" (9.5 mm)
below an aluminum hull.
Ensure that the transducer is
below water level when the boat
is on plane at high speed.
Do not mount the transducer directly in the path of the
propeller. The transducer can cause cavitation that may
degrade the boat performance and damage the propeller.
Mount the transducer parallel
with the bottom.
Required Tools (not included)—drill, 3/8" wrench or socket, 5/32" (4 mm) and 1/8" (3.2 mm) drill bits, masking tape, number 2 Phillips screwdriver, and marine sealant.
To mount the transducer on a transom:
1.Positionthetransducermountattheselectedtransomlocation.Makesurethetransducerisparallelwiththewaterline.Markthecenter
locationsofeachholeonthetransducermount.
2.Usinga5/32"(4mm)bit,drillthepilotholesapproximately1"(25mm)deepatthemarkedlocations.Toavoiddrillingtheholestoodeep,
wrapapieceoftapearoundthebitat1"(25mm)fromthepointofthebit.
3.Applymarinesealanttothe5×30mmscrews.Attachthetransducerassemblytothetransomusingthe5×30mmscrews.Adjust
thetransducerassemblytoextendbeyondthebottomofthetransomapproximately1/8"(3mm)onberglasshullsor3/8"(10mm)on
aluminumhulls.Adjustthetransducerassemblytobealignedparallelwiththewater.
4.Tightenthe10-32lockingnutuntilittouchesthemountingbracket,andthentighten1/4turnmore.(Donotovertighten.)
5.Placetherstcableclamponthetransducercable,approximatelyonethirdofthedistancebetweenthetransducerandthetopofthe
transom.
6. Markthelocation.Usinga1/8"(3.2mm)bit,drillapilotholeapproximately3/8"(10mm)deep.
7.Attachthecableclampusingoneofthe4×12mmscrews.Coatthescrewwithmarinesealantbeforeinstallation.Repeatsteps5and6
usingtheothercableclamp.
8. RoutethetransducercabletotheFishnder300C.Donotcutthecable.Avoidroutingthecableclosetoelectricalwiresorothersourcesof
electricalinterference.