9-3 Convertible (9400) L4-2.0L Turbo (2.0 HOT) (2003)
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Convertible Top Hydraulic Control Unit: Description and Operation
Hydraulic Valves
On the hydraulic unit, located in the torsion box behind the rear seat, there is a pump block and valve block. Four electromagnetic hydraulic valves are
fitted in the valve block and the function of the valves is to direct the oil flow to the main sequence hydraulic cylinders as well as the fifth bow hydraulic
cylinders. The valve has three connections, oil pressure in from the pump, oil pressure to the hydraulic cylinder and return oil to the reservoir. The valve
has two positions, active and resting. When the valve is active, pressure in from the pump is connected to pressure to the hydraulic cylinder, and when
the valve is resting pressure to the cylinder is connected to the return line to reservoir.
