Legend Coupe V6-3206cc 3.2L SOHC FI (1991)
Unloader System
The control valve shifts the direction of fluid flow when the steering wheel is turned, right or left. However, when the wheel is turned to right or left
lock at parking speed, the edge of the pinion holder rides up on the end of the rack, moving the pin in the opposite direction which pulls the control
valve back to neutral.
This keeps pump pressure from building up (which could cause idle speed to drop), and improves steering feel by increasing resistance at left and right
lock.
Speed Sensor
The speed sensor is a trochoid-rotor, hydraulic pump combined with a relief valve and a one-way valve. It is driven by the speedometer gear shaft
which in turn is driven by a helical gear on the differential.
It turns only when the car is moving, controlling the cut-off valve by regulating fluid pressure in the control unit according to the speed of the car.
With the car parked engine running, fluid flow through the sensor rotors is blocked because the rotors are not turning
