Exmark VANTAGE S Series - Hydraulic System Air Purge

Maintenance
8.Startengineandmovethrottlecontrolaheadto
fullthrottleposition.Movethespeedcontrol
levertothemiddleposition,placethedrivelevers
inthe“drive”position,andrunforoneminute.
Shutdownthemachine,allowthehydrostocool
andrecheckoillevel.
Ifeitherdrivewheeldoesnotrotate,oneorboth
ofthechargepumps(locatedonthetopofthe
mainpumpasshowninFigure21)mayhavelost
their“prime”.RefertoHydraulicSystemAir
Purgesection.
9.Removethejackstands.
Note:DoNotchangehydraulicsystemoil(except
forwhatcanbedrainedwhenchanginglter),unless
itisfelttheoilhasbeencontaminatedorbeen
extremelyhot.
Changingoilunnecessarilycoulddamagehydraulic
systembyintroducingcontaminatesintothesystem.
HydraulicSystemAirPurge
ServiceInterval:Asrequired
Airmustbepurgedfromthehydraulicsystem
whenanyhydrauliccomponents,includingoil
lter,areremovedoranyofthehydrauliclinesare
disconnected.
Thecriticalareaforpurgingairfromthehydraulic
systemisbetweentheoilreservoirandeach
chargepumplocatedonthetopofeachvariable
displacementpump(Figure21).Airinotherpartsof
thehydraulicsystemwillbepurgedthroughnormal
operationoncethechargepumpis“primed”.
Figure21
1.Chargepumpcap2.Loosen11/2turnsonly
1.Stopengineandwaitforallmovingpartstostop.
Raisetherearofthemachineupontojackstands
highenoughtoraisethedrivewheelsoffthe
ground.
2.CheckoillevelasstatedinCheckHydraulicOil
Levelsection.
3.Startengineandmovethrottlecontrolaheadto
fullthrottleposition.MoveRHmotioncontrol
leverinward(together)andmovebothlevers
forwardwithequalpressure.
Ifeitherdrivewheeldoesnotrotate,itispossible
toassistthepurgingofthechargepumpby
carefullyrotatingthetireintheforwardposition.
Note:Itisnecessarytolightlytouchthecharge
pumpcapwithyourhandtocheckthepump
temperature.Ifthecapistoohottotouch,turn
offengine.Thepumpsmaybedamagedifthe
pumpbecomestoohot.
Ifeitherdrivewheelstilldoesnotrotatecontinue
withstep4.
4.Thoroughlycleantheareaaroundeachofthe
chargepumphousings.
5.To“prime”chargepump,loosentwohexsocket
headcapscrews(showninFigure21)11/2turns
only.Makesureengineisnotrunning.Lift
thechargepumphousingupwardandwaitfor
asteadyowofoiltoowoutfromunderthe
housing.Retightenthecapscrews.Dothisfor
bothpumps.
Note:Hydraulicreservoircanbepressurizedup
to5psitospeedthisprocess.
6.Ifeitherdrivewheelstilldoesnotrotate,stop
andrepeatsteps4and5abovefortherespective
pump.Ifwheelsrotateslowly,thesystemmay
primeafteradditionalrunning.Checkoillevel
asstatedinChecktheHydraulicOilLevel
section.
7.Allowunittorunseveralminutesafterthecharge
pumpsare“primed”withdrivesysteminthefull
speedposition.CheckoillevelasstatedinCheck
theHydraulicOilLevelsection.
8.Checkhydrodrivelinkageadjustmentasstatedin
HydroDriveLinkageAdjustmentsectionin
Adjustments.
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