Hydraulics
HydraulicsThe top is raised and lowered by means of an electrically controlled hydraulics system. The servo pump and motor are located on the right-hand side, underneath the rear seat. Plastic hoses run from the pump to the two servo cylinders, which are attached to the operating mechanism for the top.
The hydraulic system is precharged at the factory with special hydraulic fluid, part no. (45) 30 18 694. Please note that this is the only fluid that may be used. Earlier particulars stating that ATF fluid or engine oil may be used are thus no longer valid.
A bypass valve is fitted in the circuit between the pump and the right-hand servo cylinder to enable the top to be operated manually. The valve is accessible behind a flap in the trim at the back of the luggage compartment.
To prevent the pump from overheating, an overload device isolates it automatically if it has been running for more than 10 - 20 seconds with the top fully up or down.