Multi Pro 5700 - Toro
Multi Pro 5700 - Toro
Multi Pro 5700 - Toro
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Steering Circuit<br />
A single section gear pump is coupled to the piston (traction)<br />
pump. The gear pump supplies hydraulic flow to<br />
the steering control valve and the spray pump drive hydraulic<br />
motor. Pump hydraulic flow is delivered to the<br />
two circuits through a flow divider with the steering circuit<br />
having priority. The gear pump takes its suction from<br />
the hydraulic reservoir. Steering circuit pressure is limited<br />
by a relief valve located in the gear pump.<br />
The steering control valve includes a check valve that allows<br />
steering operation when the engine is not running.<br />
Steering wheel rotation with the engine off causes oil<br />
flow from the steering control gerotor. The check valve<br />
opens in this situation to allow oil flow from the steering<br />
control to the steering cylinder in a closed loop.<br />
Hydraulic flow and pressure to the steering control valve<br />
can be monitored at the outlet of the gear pump.<br />
With the steering wheel in the neutral position and the<br />
engine running, gear pump flow enters the steering control<br />
valve (port P) and goes through the steering control<br />
spool valve, by–passing the rotary meter (V1) and steering<br />
cylinder. Flow leaves the control valve (port T), to the<br />
oil cooler, and returns to the hydraulic oil reservoir.<br />
Left Turn<br />
When a left turn is made with the engine running, the<br />
turning of the steering wheel positions the spool valve so<br />
that flow goes through the top of the spool. Flow entering<br />
the steering control valve from the gear pump goes<br />
through the spool and is routed through the rotary meter<br />
(V1) and out the L port. Pressure extends the steering<br />
cylinder piston for a left turn. The rotary meter ensures<br />
that the oil flow to the cylinder is proportional to the<br />
amount of the turning on the steering wheel. Fluid leaving<br />
the cylinder flows back through the spool valve, then<br />
to the oil cooler and returns to the reservoir.<br />
The steering control valve returns to the neutral position<br />
when turning is completed.<br />
Right Turn<br />
When a right turn is made with the engine running, the<br />
turning of the steering wheel positions the spool valve so<br />
that flow goes through the bottom of the spool. Flow entering<br />
the steering control valve from the gear pump<br />
goes through the spool and is routed through rotary meter<br />
(V1) but goes out port R. Pressure contracts the<br />
steering cylinder piston for a right turn. The rotary meter<br />
ensures that the oil flow to the cylinder is proportional to<br />
the amount of the turning on the steering wheel. Fluid<br />
leaving the cylinder flows back through the spool valve,<br />
then to the oil cooler and returns to the reservoir.<br />
The steering control valve returns to the neutral position<br />
when turning is completed.<br />
STEERING CYLINDER STEERING CYLINDER STEERING CYLINDER<br />
NO PISTON MOVEMENT PISTON MOVEMENT PISTON MOVEMENT<br />
R<br />
L<br />
R<br />
L<br />
R<br />
L<br />
T<br />
P<br />
STEERING<br />
CONTROL<br />
T<br />
P<br />
STEERING<br />
CONTROL<br />
T<br />
P<br />
STEERING<br />
CONTROL<br />
NEUTRAL POSITION LEFT TURN RIGHT TURN<br />
Figure 9<br />
Hydraulic System Page 4 – 10 <strong>Multi</strong> <strong>Pro</strong> <strong>5700</strong>–D