Subaru LEGACY 2002 Quick Reference Index page 470

Power Assisted System (Power Steering)
Maximum pressure control
When the hydraulic circuit in the steering gear box is closed as a result of a steering action, the
pressure in the circuit increases to a very high level. The relief valve prevents the pressure from
exceeding a preset safe level in the following way:
If the fluid in the circuit is pressurized to the preset pressure, the fluid pushes the ball of the valve
overcoming the tension of the relief spring. Through the opened relief valve, the fluid makes its
way to the pump's suction side passage, thus maintaining the circuit pressure at a level lower than
the preset pressure.
(1) Reservoir tank fluid
(2) Relief valve
(3) Gear box
(4) Relief spring
POWER STEERING SYSTEM
(4)
(1)
(2)
PS-30
(3)
B4H2481A