Steering Circuit
The gear pump (P2) is directly coupled to the hydrostat.
It supplies hydraulic pressure to the power steering
valve for turning the rear wheel and maintaining 100 to
the oil flow to the cylinder is proportional to the amount
of the turning on the steering wheel. Fluid leaving the
cylinderflowsbackthroughthespoolvalvethenthrough
the OUT port and to the hydrostat.
150
PSI (6.9 to 10.0 Bar) to the low pressure side of the
traction circuit. The pump takes its suction from the hy-
draulic reservoir.
The steering control valve returns to the neutral position
when turning is complete.
With the steering wheel in the neutral position (rear
wheel positioned straight ahead), the engine running,
andthespoolvalveinthecenterposition,flowentersthe
steeringcontrolvalveattheINportandgoesthroughthe
spoolvalve,by--passingtherotarymeter(V1)andsteer-
ing cylinder. Flow leaves the control valve through the
AUXporttothehydrostattobeavailablefortheliftcircuit
and then to the hydrostat (charge).
Left Turn
When a left turn is made with the engine running, the
turningofthesteeringwheelpositionsthespoolvalveso
thatflowgoesthroughthetopofthespool.Flowentering
the steering control valve at the IN portgoes through the
spool and is routed to two places. As in a right turn, most
of the flow through the valve is by--passed out the AUX
port back through the 2--spool valve to the hydrostat.
Also like a right turn, the remainder of the flow is drawn
throughrotarymeter(V1)butgoesoutport(L).Pressure
extends the piston for a left turn. The rotary meter (V1)
ensures that the oil flow to the cylinder is proportional to
the amount of the turning on the steering wheel. Fluid
leaving the cylinder flows back through the spool valve
then through the OUT port and to the hydrostat.
Right Turn
When a right turn is made with the engine running, the
turningofthesteeringwheelpositionsthespoolvalveso
that flow goes through the bottom of the spool. Flow en-
tering the steering control valve at the IN port goes
throughthespoolandisroutedtotwoplaces.First,most
of the flow through the valve is by--passed out the AUX
port back through the 2--spool valve to the hydrostat.
Second, the remainder of the flow is drawn through the
rotary meter (V1) and out port (R). Pressure retracts the
pistonforarightturn.Therotary meter(V1)ensuresthat
The steering control valve returns to the neutral position
when turning is complete.
Groundsmaster 3500--D
Page 4 -- 21
Hydraulic System (Rev. D)
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