Toro groundsmaster 455-D - Hydraulic Flow Diagrams

Wing Lift Cylinder
Wi
ng Counter
Balance Valve
Groundsmaster
®
455-D Page 4 - 7 Hydraulic Flow Diagrams
Oil
Steer Cy
linder
Cooler
Traction Motor
Hydraulic Flow Diagrams
Orb
Reservoir
itrol
Val
l
Balance Val
Check Val
Pressure
Center Unit Lift Cylinder
Steering
Traction Motor
Check
ve
Lift Va ve
Counter
ve
ve
Filter
ENGINE
Traction Pump
Aux. Pump
Center Unit Lift Cylinder
Return
Wing Lift Cylinder
Suction
General Auxiliary Pump Flow
Flow
With all controls in neutral and the engine running, oil is drawn from the reservoir by the auxiliary pump. This gear-type pump has a flow divider cover. Priority flow goes to the steering valve, then through the oil cooler, filter, and back to the traction pump. Secondary flow goes to the lift valve, then through the counterbalance valve, oil cooler and back to the traction pump. Return flow from the auxiliary circuit provides charge oil for the closed loop traction circuit. Excess return flow goes over the charge relief valve in the traction pump and back to reservoir.
Hydraulic System