Steering Circuit
A three section gear pump is coupled to the piston (trac-
tion) pump. The gear pump section (P3) supplies hy-
draulicflowtothesteeringcontrolvalveandthelift/lower
controlvalve.Pumphydraulicflowisdeliveredtothetwo
circuits through a proportional flow divider. The gear
pump takes its suction from the hydraulic reservoir.
Steering circuit pressure is limited by a relief valve lo-
cated in the steering control.
a left turn. The rotary meter 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
backthroughthespoolvalvethenthroughtheTportand
to the hydraulic reservoir.
The steering wheel and steering control valve return to
the neutral position when turning is completed.
Pressure to the steering control valve can be monitored
at a port on the end of the gear pump.
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 P port goes
through the spool and is routed to two places. As in aleft
turn,mostoftheflow through the valve is by--passedout
the PB port back to the oil filter and traction charge cir-
cuit. Also like a left turn, the remainder of the flow is
drawn through rotary meter (V1) but goes out port R.
Pressure extends the piston for a right turn. The rotary
meter ensures that the oil flow to the cylinder is propor-
tional to the amount of the turning on the steering wheel.
Fluid leaving the cylinder flows back through the spool
valve then through the T port and to the hydraulic reser-
voir.
With the steering wheel in the neutral position (rear
wheels positioned straight ahead) and the engine run-
ning, flow enters the steering control valve at the P port
and goes through the steering control spool valve, by--
passing the rotary meter (V1) and steering cylinder.
Flow leaves the control valve through the PB port to the
oil filter and traction charge circuit.
Left Turn
When a left turn is made with the engine running, the
turningofthesteeringwheelpositionsthespoolvalveso
thatflowgoesthroughthetopofthespool.Flowentering
the steering control valve at the P port goes through the
spool and is routed to two places. First, most of the flow
through the valve is by--passed out the PB port back to
the oil filter and traction charge circuit. Second, the re-
mainder of the flow is drawn through the rotary meter
(V1) and outthe L port. Pressure contracts the piston for
The steering wheel and steering control valve return to
the neutral position when turning is completed.
STEERING CYLINDER
STEERING CYLINDER
PISTON MOVEMENT
STEERING CYLINDER
NO PISTON MOVEMENT
PISTON MOVEMENT
R
L
R
L
R
L
1
180
1180
PSI
1180
PSI
PSI
T
PB
P
T
PB
P
T
PB
P
STEERING
CONTROL
STEERING
CONTROL
STEERING
CONTROL
NEUTRAL POSITION
LEFT TURN
RIGHT TURN
Figure 18
Groundsmaster 4500--D/4700--D
Page 4 -- 19
Hydraulic System (Rev. A)
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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| Document Type | Service Manual |
| Language | English |
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