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Lift/LowerCircuit:Raise

Asingle-sectiongearpumpisdirectlycoupledtothetransmissionwhichisdriven

bytheengine.Thisgearpumpsupplieshydraulicowforboththesteeringand

lift/lowercircuits.Thegearpumpowisroutedtothesteeringcontrolvalve

rstsothatthesteeringcircuithaspriority.Thepumptakesitssuctionfrom

thehydraulictank.

Whenthedeckliftswitchisinitsneutralstate,owfromthegearpumpbypasses

theliftcylinderandisroutedthroughthedeckliftmanifolddirectlytotheoil

coolerandthentothetransmission.Thetransmissioncasedrainallowsthe

hydraulicuidtoreturntothehydraulictank.

Note:IfthedeckliftswitchispressedtotheRAISEpositionwhilethesteering

wheelisbeingturned,theliftspeedwillbereduced.

WhenthedeckliftswitchispressedtotheRAISEpositionandheld,thesolenoid

valves(S1andS2)inthedeckliftmanifoldareenergizedtocausethevalves

toshift.TheenergizedsolenoidvalveS2preventsthegearpumpowfrom

bypassingtheliftcylinder.TheenergizedsolenoidvalveS1allowshydraulicuid

owfromthegearpumptothebarrelendoftheliftcylinder.Theliftcylinder

extends,causingthecuttingdecktoraise.Theuiddisplacedfromtherod

endoftheliftcylinderisroutedtotheoilcooler,transmission,andthentothe

hydraulictank.Anoricettinginthedeckliftmanifoldcontrolsthespeedofthe

liftcylinderwhileraisingthecuttingdeck.

Theloadontheliftcylindercausesliftcircuitpressuretoincrease.Ifliftcircuit

pressurereaches12,500kPa(1,800psi),thereliefvalveinthegearpumpshifts

toallowpumpowtoreturntothehydraulictank.

WhenthedeckliftswitchisreleasedfromtheRAISEposition,boththesolenoid

valves(S1andS2)inthedeckliftmanifoldarede-energized.Thede-energized

solenoidvalveS2allowsthegearpumpowtobypasstheliftcylinder,returning

totheoilcooler,transmission,andthentothehydraulictank.Thede-energized

solenoidvalveS1preventsthehydraulicowtoandfromtheliftcylindertokeep

thecuttingdeckintheraisedposition.

HydraulicSystem:HydraulicFlowDiagrams

Page4–22

Groundsmaster360

16225SLRevC

Toro Groundsmaster 360 Service Manual

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