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AerialLiftsTheentirecontentofthispresentationiscopyright2008,HydraForceInc.

HydraForceandtheHydraForcelogoareregisteredtrademarksofHydraForceInc.ScissorsApplicationsNeeds:SteeringRaise,Lower&holdDrive&BrakeControlTractionControl(RT)2-wheel-typical4-wheel–typical11SteeringSystemsNeedsBecauseflowisatapremiumonmostscissorslifts,atandemcenterspoolisneededonthesteeringdirectionalcontroltore-combinethesteeringoilbacktotheby-passworkport.21SteeringSystemsNeedsThesteeringfunctionalsousesmuchlowerpressure&flowcomparedtotherestofthesystem.Thisusuallyrequires2valves,apriorityflowcontroltolimittheflowandapressurecontrolforlimitingpressureinthesteeringleg.31HydraForceSteeringSolutionHydraForcehascreatedaNEWtwoinonecartridgewhichcombinesthepriorityflowrequirementandthepressurecontrolintoonecartridge.FRRV10-41FForthetandem3position4waysteeringdirectionalcontrolweusetheHF“A”typespool.SV08-47ASV10-47A41Raise,Lower&HoldSystemNeedsMostscissorsliftsusea2positionpoppetsolenoidvalveintegratedintothebaseofthecylinderforlowering/loadholdinganda2position4wayinthemanifoldthatswitchesbetweenliftanddrive.Thegravitydownfunctionisusuallylimitedtoafixedspeedhowever,HydraForcecanofferasoftshiftorproportionalversionthatfitsthesamecavity.Apoppettypeloadholdingloweringvalveisneeded.51HydraForceoffersavarietyof2position3wayvalvesforthepowerupfunction.SV10-40Apoppettypeon/offvalveisusedforloadholdingandgravitydown.SV10-20HydraForcecanofferaproportionalpoppetthatfitsthesame2waycavitywhichwillofferloadholdingandproportionaldownSP10-20Raise,Lower&HoldSolutions

61Mostscissorsuseaspringappliedandhydraulicreleaseparkbrake.HydraForcehasawidevarietyofshuttlevalvesthatcouldbeusedhere,connectingthehighsideofthedrivecircuittotheparkbrake.Toachievetherequireddriveperformanceextremesofhighgrade-abilityandtravelspeeds,thedrivemotorsareswitchedfromseriestoparallel*HydraForcehasthewidestvarietyofsolenoidandpilotdirectionalcontrolswhichallowustobettermeetthedemandsoflowcostandlowpressuredropseriesparallelcircuitry.HydraForceDrive&BrakeSolutions712-WheelTractionControlSolutionsThenewHydraForceheavyduty,higheraccuracyflowdividersworkeffectivelyintractioncontrolcircuitsFD50-44andtheFD50-45

812-WheelTractionControlSolutions914-wheelinnovation4-WheelTractionControlSolutionsSeveralvariationsofthistypeofflowdividercircuitareavailable101HydraForce’sPEseriesmeterin&meteroutspoolconfigurationlendsitselfnicelytoafourwheeldrivetractioncontrolsystem,eliminatingtheneedforflowdividersaltogether,thusreducingpressuredropsignificantly.PE16-S67CEHPR98-T33InnovationinTractionControl

111MainControlBlock121SteeringFunctionThesteeringfunctionusesa4-waydirectionalvalvetoconnectthecylindertotank131LiftingFunctionTheliftcircuitisconnectedtotankCanlockouttheDrivefunctionwitha4waydirectionalvalve141DrivesystemTheDriveValveallowsforselectingbetweenfwdandaftfunctionsAllflowisavailableforeitherfunctionThesoftstopvalveallowstheflowtobecomeregenerativewhentransitioningtopark,whilethecounterbalancevalvepilotsflowthroughthedrivemotors151BrakingFunctionSpringappliedparkingbrakedisablesthedrivesideofthecircuitManuallyactivatedbytheoperatorwithtwooptionsforrelease161MainControlBlock171SelfPropelledBoomNeedsPlatformFunctionsBoomFunctionsDriveFunctionAdditionalFunctions4-wheelinnovation181PlatformNeedsOneofthemostcriticalneedsforaselfpropelledboom,isthattheplatformmustremainhorizontalandstableduringallmovementoperations.Platformlevelingcontrolsshouldbeautomaticinrelationtotheboomposition,withmanuallyoperatedtrimcontrols.Operatorsmusthavecontroloftheplatformrotation,thejibraiseandlowerfunctions,aswellastheplatformtrimfunctions.191PlatformSolutionTypicallyplatformrotate,manualtrimandjibfunctionsaresimpleOn/Offtypeor“bang-bang”valves.SV08-47CPlatformraiseandlowerfunctionsareproportionalforsmoothstartandstop,aswellasinfinitepositioningandfinemetering.SP08-47C(L)EVDRValveDriver

201BoomFunctionNeedsTheboommustbeabletoberaisedandloweredfromnearverticaltobelowhorizontalallthewhilemakingsuretheoperatorplatformremainslevelandstable.Theboommustalsobeabletoextendedortelescope.211BoomFunctionNeedsTurretrotationwillnormallybe180Orotationineitherdirection(non-continuous)orContinuous(thoughit’smoreexpensive).Turretpositionishoweveralwaysproportionalandusuallyrequiresahighleveloffinemetering(secondhighestlevelisrequiredbytheboomraiseandlowerfunction).Inorderfortheoperatortofeelsecureintheplatform,allboomfunctionsmustbesmoothandvoidofjerkymovements.221HydraForceBoomSolutionsToeliminateharshmovementsoftheplatformforoperatorstability,theuseofproportionaldirectionalcontrolvalvesisneeded.Thesevalvesalsogiveustheinfinitepositionandfinemeteringneeded.SP10-47CEVDRValveDriver

HeavyDutyJoystick231DriveSystemNeedsSelfpropelledboomsneedtobedrivenforwardandbackwardandbasicallysteeredinanydirectionfromtheworkplatform.2wheeldrive4wheeldrive–tractioncontrolSomeroughterrainmachineshaveoscillatingaxlesDrivePropelControlw/DynamicBraking

OpenandClosedLoop241DriveSolutionsDynamicbrakinginaclosedloopsystemisusuallydonewithinthehydrostaticdrivesystem.HydraForcecanofferthesameclosedloopdynamicbrakinginamuchmorecosteffectiveopenloopformatusingourPEclosedcentervalves.(Puttingoneoftheseateachwheelalsogiveexcellent4wheeltractioncontrol.)PE12-S67CFlow

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