
HYDRAULIC CYLINDERFOROUTBOARD ENGINE -page 7 of 78
InstallationandMaintenanceManual
ULTRAFLEX
ENGLISH
ULTRAFLEX hydraulicsteeringsystemsshouldnotbeusedinracingapplications.
To avoidproductdamage,donotdisassemblepre-assembledcomponents.
All ULTRAFLEX steeringsystemsmustnotbeinstalledonboatsequippedwithengines whosemaximum
horsepoweris higherthanthehorsepowerratingapprovedby boatmanufacturer.
1.2 Warningsfortheproductcorrectuse
Beforebeginningtheinstallation,checkthemountingcompatibilityoftheUC128-TScylindertotheengine
byconsultingtheattachteddocument"ApplicationGuide"containedinthepackaging.
Do notmodifythesteeringcylinderinanyway tofitittoyourengineapplication,otherwise thecylinderwill
nolongeroperateinsafetyanditwillendangertheboatandtheoccupants.
WARNING
WARNING
WARNING
DANGER
DANGER
1PRODUCTDESCRIPTION
1.1Hydraulicsteeringsystemoperation
All ULTRAFLEX hydraulicsteeringsystemsaredesignedinconformitywithUNI-EN-ISO10592 andA.B.Y.C. P21
regulations. AllULTRAFLEXsteeringsystemscanoperateattemperatures between-18°C(0°F)and+77°C
(+170°F).All thecomponentsaremadeforthemarineenvironment,usingmaterialsandworkingprocesses
whichofferlonglifeandsafetyunderthemostextremeconditions. Ahydraulic steeringsystemconsistsof
asteeringpump,acylindertiedtotherudderortotheoutboard or
sterndriveengineandtheconnectinghoses(seepicture).Under
normaloperatingconditions, aturnofthesteeringwheelwill pump
theoil,whichflowsinthroughthehosestothecylinder,according
totheturndirection.Withtheconsequentcylindermovementtheoil
will flowtothepumpthroughthehoses andatthesametimemoves
theengineorthehelmwhichareconnectedtothecylinder.The
pumpsareequippedwithavalve,whichpreventsoutgoingfluid
fromreturningalongthesamehose. Italsoallowstheoperationof
thesteeringsystemswithtwoormoresteeringstations.The
cylindersaredoubleactingandmaybebalancedorunbalanced.In
theunbalancedcylindersthetwochambershave differentvolumes
andsothey needadifferentnumberofturnsofthesteeringwheel
andadifferentrotationeffort.Thebalanced cylindershavesame
numberofsteeringwheelturnsinordertomove thehelmfromthe
centertotheendstrokeinthetwooppositedirections. Awell balanced steeringsystemneedsacorrect
choice ofthepumpforthecylinder. ULTRAFLEX produces differentpumpmodels,whichhave differentcapacity
(cm3ofoilmovedeachsteeringwheelturn)andforeachtypeofinstallation.Whilechoosingthepumpitis
importanttoconsiderthecylindervolume.Thenumberofstarboard andportturnsis determinedbythe
ratio betweenthecylindervolumeandthepumpcapacity.
Example:ifthepumphas acapacityof28cm3 [1,7cu.in.]andthecylinderhas avolumeof120cm3 [7,3cu.in.],the
formulalookslikethis:120/28=4,2. Accordingly,thesteeringwheelwillturn4,2timesbeforethecylinder
willcompletelyturnfromonesidetotheother.Incaseofinstallationswithdoublecylindersconnectedin
parallelthecylindervolumemustbeadded.Applicationswithlessthan4turnsarenotrecommended,as
theyneedahighereffort,alsoapplicationswithmorethan8turnsarealso notrecommended,as the
response oftheboattosteeris slowly.Themaximum operatingpressureis 7,0MPa(70bar)(1000PSI).
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