Hydraulic Components

Hydraulic Components





A pair of cylinders each acts on the main pillars, convertible top compartment lid and tensioning rods. The cylinders are double acting, i.e. operated both from the piston as well as from the rod end.

The operating direction of the main pillar cylinders depends on the direction of rotation of the hydraulic pump.

The convertible top compartment lid is extended by corresponding actuation of the change over valve 6. The cylinders for the convertible top compartment lid are designed such that the pressure on the piston rod end is always prevalent. The tensioning rods are extended and retracted by correspondingly switching the change over valves 4 and 5.

Change over valve 7 is responsible for Repressurizing the hydraulic system. Change over valve 7 is activated for as long as the hydraulic pump is operating and/or pressure is applied to the piston end of the cylinders for the convertible top compartment lid so as to maintain pressure in the hydraulic system. Change over valve 7 is no longer actuated when no pressure is applied to the piston end of the cylinders for the convertible top compartment lid and the hydraulic pump is stationary. The pressure is then reduced via change over valve 7, thus Repressurizing the hydraulic system.

The pressure relief valves open at a system pressure of approximately 190 bar.

Hydraulic Diagram





The hydraulic oil need not be changed (lifetime filling). If it is necessary to top up the hydraulic oil due to leaks, particular care must be taken to ensure that only approved hydraulic oil is used for this purpose (see electronic parts catalogue). Top up hydraulic oil only up to the mark on the oil reservoir.

If the noise level is excessively high during operation of the convertible top, open and close the convertible top several times in succession in order to bleed the system.

The hydraulic system is bled automatically in the oil reservoir.
A temperature sensor measures the temperature of the electric motor in the hydraulic unit. The convertible top can only be closed once automatically as from a temperature of 90°C and can then no longer be opened.