SteeringCircuit(MachineSerialNumberbelow316000000)
g229584
Figure56
Thechargepumpinthetransmissionsuppliesowforthesteeringcircuitand
fortheliftcircuit.Chargepumpoutputowstothesteeringcontrolvalvebefore
reachingtheliftvalvesothatthesteeringcircuithaspriority.Steeringcircuit
pressureislimitedto5,515kPa(800psi)bytheimplementreliefvalvelocatedin
thetransmission.
Whenthesteeringwheelisnotbeingturnedandtheengineisrunning
(transmissioninputshaftbeingrotated),chargepumpowentersthesteering
controlvalveatthePportandby-passestherotarymeterandsteeringcylinder.
FlowleavesthesteeringcontrolvalvethroughtheEportandisdirectedtothe
liftcontrolvalve.
LeftTurn
Whenaleftturnismadewiththeenginerunning,theturningofthesteering
wheelpositionsthesteeringcontrolspoolvalvesothatowgoesthroughthe
bottomofthespool.FlowenteringthesteeringcontrolvalveatthePportpasses
throughtherotarymeterandisdirectedouttheLport.Pressureretractsthe
steeringcylinderforaleftturn.Therotarymeterensuresthattheuidowtothe
cylinderisproportionaltotheamountoftheturningonthesteeringwheel.Fluid
leavingthesteeringcylinderowsbackthroughthespoolvalve,thenouttheT
portandreturnstothehydraulicreservoir(frontaxle).
Groundsmaster
®
3280-D/3320
Page5–35
HydraulicSystem:HydraulicFlowDiagrams
05138SLRevB
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