DRIVER'S MANUAL SB220GS - Training Registration System

If the door-controlled brake is in use, the
warning lamp on the instrument panel lights
up.
If the door-controlled brake is in use, the
driver must never leave the driver’s seat.
ZF/VOITH RETARDER
The retarder is a hydrodynamic brake which
is integrated in the gearbox.
The retarder consists essentially of an oil
pump which is driven by the vehicle.
Braking force is subsequently applied to the
circulating oil. This braking force generates
heat which is dissipated to atmosphere via
the heat exchanger. In this way a wear-free
transmission brake is created, which
enables driving the vehicle downhill at
relatively high speeds, without having to use
the service brakes.
Use of the retarder saves wear and tear on
the service brakes which are therefore fully
at the driver’s disposal.
Retarder ZF/VOITH
The retarder is a wear-free, hydraulic,
continuous brake and is therefore ideal for
downhill braking or additional braking.
The retarder is operated by the service
brake foot pedal.
When the retarder is used for continuous
braking (e.g. during extended downhill
braking), a close watch should be kept on
the SWS panel and the instrument panel.
If the pointer of the temperature gauge
reaches 150°C, a warning lamp will light up.
If the warning lamp lights up, further use of
the retarder must be avoided until the oil
temperature is reduced again.
If the oil temperature remains too high,
proceed as follows:
- Stop the vehicle
- Put the selector switch into neutral
- Allow the engine to run with a slightly
increased stationary speed. If after a few
seconds, the temperature is still not in
the acceptable area, check the oil level
and the cooling system for faults.
DRIVING
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