Roll bar manual actuation, function - GF91.59-P-2000KA

Models 208.435 /444 /445 /447 /448 /465 /470 

The manual actuation  (raising and lowering) of the roll bar ensues with the aid of the RB switch (manual operation, S83  . Manual actuation is also possible when the soft top is closed and when driving.

The roll bar's raising speed is significantly lower during manual actuation than in a crash deployment.

Raising roll bar 

The hydraulic cylinder when being raised has pressure applied to the piston side (arrow D)  and rod side. While the roll bar moves upwards the spring is relaxed (5)  .

The roll bar's raising speed is controlled by a throttle in the control element and by dampers. The raising force results from spring force, hydraulic force and throttle forces.

In order to prevent any noise occurring when the roll bar is raised (lock pawl - gear rack), the spring-loaded lock pawls (4)  on both sides are swiveled hydraulically away from the gear rack.

When the upper limit position is reached it is signaled by the roll bar (RB) raised limit switch (S83/6)  .

Lowering roll bar 

When lowering (automatic for soft top operation or with S83), the gear rack's lock pawl is unlocked and the hydraulic cylinder on the rod side has pressure applied to it (arrow E)  . This then lowers the roll bar. The lowering movement causes the spring for the roll bar's crash deployment to be automatically re-tensioned.

When the lower limit position is reached it is signaled by the roll bar (RB) lowered limit switch (S83/5)  .

Blocking of manual actuation 

Operation of the roll bar with the aid of S83 is blocked by the roll bar (RB)/soft top operation control module (N52)  in the following instances:

• during an automatic triggering of the roll bar

• at a fault on the S83
• at undervoltage in the vehicle's electric system
• at overheating of the motor (A7/5m1 motor)  of the roll bar (RB)/soft top operation hydraulic unit (A7/5) 
• at intermediate positions of the soft top
• at various errors in the N52

Manual actuation after crash deployment 

To lower the roll bar after a crash deployment the S83 switch must be pressed in any direction until the lock (7) can be heard to engage in place. The hydraulic cylinder has pressure applied to it over the RB valve block (Y57)  and the deployment solenoid (Y57/1)  is moved upwards to engage with the lock (7), in order to "capture" the roll bar. After this the roll bar can be lowered again.

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