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GENERAL INFORMATION
OVERVIEW
This chapter describes the basic power steering system
without ECPS installed in Rexton.
The power steering system consists of pump, oil reservoir,
rack and pinion gear. The power steering pump is a vane
type and delivers hydraulic pressure to operate the power
steering system. The pressure relief valve in pump con-
trols the discharging pressure.
The rotary valve in rack and pinion gear directs the oil from
the power steering pump to one side of rack piston.
The integrated rack piston converts the hydraulic pres-
sure to linear movement.
The operating force of rack moves the wheels through tie
rod, tie rod end and steering knuckle.
Even though the hydraulic pressure cannot be generated,
a driver can steer the vehicle without power assist but it
needs very high steering force.
In this case, the operating force of steering wheel is con-
veyed to pinion, and the movement of pinion moves the
rack through pinion gear combined to rack gear.
Power Steering Pump
The vane type pump that is connected to engine by belt is
used for the power steering system. This pump generates
and controls a proper hydraulic pressure and flows by using
the flow control valve and pressure relief valve.
The flow control valve regulates the excessive amount of
discharging oil. When the steering wheel is stationary or
the oil circuit is blocked, the pressure relief valve returns
the over pressurized oil to the oil reservoir to maintain a
specified oil pressure level all the time.
POWER STEERING
REXTON SM - 2004.4
Power Steering Gear Assembly
The power steering gear consists of power cylinder and
control valve.
The power cylinder has cylinder, piston and piston rod.
The control valve directs the oil to one end face of the
piston to enhance the steering force.
The control valve controls the directions and operations of
power cylinder.
Additionally, the safety check valve is installed so that the
system can be operated manually when the system is
defective.
Oil Reservoir
The oil reservoir sends the oil to the power steering pump
and receives the oil from the power steering gear.
The oil level in the reservoir depends on the steering wheel
positions. therefore, measure the oil level when the steer-
ing wheel is positioned at straight ahead direction (neutral).
6C-3
Y220_06C001
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
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