General

Function description of roadster top, coupe roof






Roadster top, coupe roof
Roadster top






The standard equipment for model 129 includes a hydraulically actuated roadster top and a coupe roof. The switch for opening and closing the top is located on the center console. The top can be opened within approx. 30 seconds and stored in the top compartment by pressing the switch toward the rear and holding in this position or removed from the top compartment and closed by pressing the switch toward the front and holding in this position (when closing it may be necessary to "help" slightly by manually guiding the front top frame into the initial catch on the front top locks). For this purpose roll down side windows and put down roll bar and return to initial position afterward. The top moves only as long as the switch is actuated. The motion can be interrupted at any desired point and then continued or reversed. During an interruption the top is locked hydraulically so that it cannot fall down. The lock is released when the ignition is switched off and the top can be moved freely. Five opening/closing operations are possible immediately one after another. More than five operations are not possible due to the thermic load on the pump and solenoid valves. Monitoring is accomplished by counting the switch-on time for the pump and solenoid valves.

Prerequisites for actuating top
- ignition switched on
- vehicle standing still
- battery voltage > 10 V
- roll bar control unit must release top actuation
- no malfunctions prohibiting top actuation stored in malfunction memory
- limit switch signals from control unit recognized as logical
- the maximum operating time must not be exceeded
- removal of the coupe roof is possible only when the time after switching on the ignition is < 10 seconds

NOTE: Do not touch top linkage, upper part of windshield or top compartment while top is being locked or unlocked (Injury hazard).

When the top is completely opened or closed or when the coupe roof is attached and locked it is possible to lock the catches -even while driving- in order to lock the front catches at the windshield frame when the mechanical safety catches have opened without interrupting the trip. The indicator light in the top switch flashes when the vehicle is being driven and the catches are not properly locked. In addition an acoustic warning signal sounds. If the vehicle is moved during actuation the top motion is stopped, simultaneously the acoustic warning signal sounds and the indicator light in the top switch flashes.

Coupe roof






The coupe roof has two catches at the front and two catches at the rear as well as two fastening points in the center area. The roof can be locked electrohydraulically in the same manner as the roadster top using the same switch on the center console.

The entire electrohydraulic system consists of fifteen hydraulic cylinders, eleven solenoid valves, five distribution and connection pieces and 45 lines. In the off state the hydraulic system is not under pressure and all latches are locked mechanically. A total of 17 limit switches signal the present position of the top to the control unit in order to assure that the opening and closing operations are completed properly.

Location of electric components











Location of limit switches