8 POWER STEERING 8 POWER STEERING
EF494T TM 06/2011 edition
8.1.3 Power steering valve functions
* When in neutral
The oil from the hydraulic pump flows into the
power steering valve. However, since the control
spool is in "neutral," the oil will return to the tank.
* During rotation
(1) The oil from the hydraulic pump flows into
the power steering valve. Under these
conditions, since there is a displacement
between the inner and outer valves of the
control spool in the power steering valve,
the circuit will open and the oil will flow into
the gyrator.
(2) The oil of the gyrator flows into the cylinder
through the control spool.
(3) The oil of the cylinder opposite the cylinder
into which the oil flowed returns to the tank
through the control spool.
(4) If the hydraulic pump pressure becomes
too high (125 + 7 kgf/cm2), the relief valve
will be activated and the oil will return to
the tank.
(A) Right turn
(B) Left turn
* During manual rotation
If there is a problem with the hydraulic pump or
when the engine is stopped, if the steering wheel
is turned the gyrator will function as a gear pump,
allowing oil to be sucked up from the tank. This
causes the check valve to open, and the sucked
oil flows into the control spool and the gyrator,
and is force fed to the cylinder.
(A) Right turn
(B) Left turn
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