Steering Circuit
The charge pump in the hydrostat supplies flow for the
steering circuit and for the cutting deck (or implement)
lift circuit. Pump output flows to the steering control
valve before reaching the liftvalve so the steering circuit
has priority. Steering circuit pressure is limited from 700
to 1000 PSI by the implement relief valve located in the
hydrostat.
out the L port. Pressure retracts the steering cylinder for
a left turn. The rotary meter ensures that the oil flow to
the cylinder is proportional to the amount of the turning
onthesteeringwheel.Fluidleavingthesteeringcylinder
flows back through the spool valve, then out the T port
and returns to the hydraulic reservoir (front axle).
Right Turn (Fig. 11)
When the steering wheel is not being turned and the en-
gine is running (hydrostat input shaft being rotated),
charge pump flow enters the steering control valve at
the P port and by--passes the rotary meter and steering
cylinder. Flow leaves the steering control valve through
the E port and is directed to the lift control valve.
When a right turn is made with the engine running, the
turning of the steering wheel positions the steering con-
trol spool valve so that flow goes through the top of the
spool. Flow entering the steering control valve at the P
port passes through the rotary meter and is directed out
port R. Pressure extends the steering cylinder for a right
turn. The rotary meter ensures that the oil flow to the cyl-
inder is proportional to the amount of the turning on the
steering wheel. Fluid leaving the cylinder flows back
through the spool valve, then out the T port and to the
hydraulic reservoir (front axle).
Left Turn (Fig. 11)
When a left turn is made with the engine running, the
turning of the steering wheel positions the steering con-
trol spool valve so that flow goes through the bottom of
the spool. Flow entering the steering control valve at the
P port passes through the rotary meter and is directed
LEFT TURN
RIGHT TURN
Figure 11
Hydraulic System
Page 5 -- 12
Groundsmaster 3280--D/3320
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| Language | English |
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