Toro 07211TC Operator's Manual page 34

Note: If hydraulic motor is used, it may see 6900 kPa
(1000 psi) back pressure.
Important
If used with a hydraulic cylinder or no
attachment, the Raise or On position causes the oil
flow to go over a relief valve which can damage the
hydraulic system. Additionally this condition does not
allow return flow to supply the power steering circuit,
which makes steering more difficult. Use these
positions only momentarily or with a motor attached.
Lower (Quick Coupler "A" Position): This position
will lower the rear hitch attachment or apply pressure
to quick coupler "A". This also allows return oil from
quick coupler "B" to flow back into the valve and then
out to the power steering circuit. This is a momentary
position and when the lever is released it spring returns
to the center off position. Momentarily holding and
then releasing the control lever in this position will
provide flow to quick coupler "A" which provides
power down on the rear hitch. When released, it will
hold the down pressure on the hitch.
Important If used with a hydraulic cylinder, holding
the control lever in the lower position causes the oil
flow to go over a relief valve which can damage the
hydraulic system.
Float Position: This valve position allows oil to flow
in and out of the work ports and is connected to the
inlet and outlet ports at the same time. This allows for
attachments as the rear hitch to " float" up and down.
The same pressure is applied to both quick couplers
due to back pressure from the steering circuit.
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