Additional axles
Starting-off aid
Activate the
starting-off aid if the drive wheels spin while pulling away with the vehicle
laden.
The vehicle can feature either a starting-off aid with speed
limiter or with time limiter (switch-on interlock):
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The starting-off
aid with speed limiter is switched off automatically when the speed exceeds
approximately 30 km/h. The starting-off aid can only be
activated again when the speed falls below approximately 30
km/h.
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The starting-off
aid with switch-on interlock switches off automatically after 90 seconds.
After approximately 50 seconds, the starting-off aid with switch-on interlock
can be reactivated.
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The starting-off
aid without switch-on interlock is deactivated automatically after 120
seconds and can be reactivated immediately thereafter.
Activating the
starting-off aid
Starting-off aid
switch
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Press the upper
section of the starting-off aid switch.
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 flashes in the display
while the starting-off aid is activated. At the same time, the status indicator
lights up in yellow.
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Leading axle
If the vehicle is empty or only partly laden, you can raise the leading axle before pulling away.
 | Environmental note |
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Raising the leading axle reduces the road resistance and can therefore lead to a reduction in tyre wear and lower fuel consumption.
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If the supply pressure in the compressed-air system is too low, run the engine.
You must lower the leading axle before loading or unloading the vehicle.
The leading axle is automatically lowered shortly before the maximum axle load of the drive axle is reached.
Leading axle switch
Raising the leading axle
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Turn the vehicle key to the drive position in the ignition lock.
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Press the upper section of the leading axle switch.
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The indicator lamp in the switch lights up. In addition, the "Raise leading axle/starting-off aid" indicator flashes in the display and the status indicator lights up yellow.
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Lowering the leading axle
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Press the upper section of the leading axle switch while the leading axle is in the raised position.
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The indicator lamp in the switch and the message "Raise leading axle/starting-off aid" and the status indicator go out.
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Trailing axle
If the vehicle is empty or only partly laden, you can raise the trailing axle before pulling away.
| Environmental note |
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Raising the trailing axle reduces the road resistance and can therefore lead to a reduction in tyre wear and lower fuel consumption.
|
If the supply pressure in the compressed-air system is too low, run the engine.
You must lower the trailing axle before loading or unloading the vehicle.
Vehicles for large-capacity transport: the trailing axle cannot be raised
Vehicles with the Telligent® trailing axle: when the trailing axle is raised, the wheels are automatically put in the straight-ahead position and the steering is locked.
Vehicles with a rear loading crane: observe the information in the manufacturer's operating instructions before raising the trailing axle.
The trailing axle is automatically lowered shortly before reaching maximum permissible axle load on the drive axle.
Trailing axle switch
Raising the trailing axle
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Turn the vehicle key to the drive position in the ignition lock.
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Press the upper section of the trailing axle switch.
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The message "Raising trailing axle/starting-off aid" flashes in the display and the status indicator lights up yellow.
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Lowering the trailing axle
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Press the upper section of the trailing axle switch while the trailing axle is in the raised position.
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The message "Raising trailing axle/starting-off aid" in the display and the status indicator go out.
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Telligent® trailing axle
The Telligent® trailing axle is a hydraulically-steered trailing axle. It is steered up to a road speed of around 45 km/h. It reduces the turning circle of the vehicle and thereby reduces tyre wear.
At speeds above 45 km/h or when the Telligent® trailing axle is raised, the wheels are automatically set in the straight-ahead position and the steering is locked.
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A malfunction in the Telligent® trailing axle is indicated by the  indicator lamp.
Have the malfunction checked and repaired at a qualified specialist workshop which has the necessary specialist knowledge and tools to carry out the work required.
Mercedes-Benz recommends that you use a Mercedes-Benz Service Centre for this purpose. All work relevant to safety or on safety-related systems must be carried out at a qualified specialist workshop.
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If the trailing axle has been lowered, the Telligent® trailing axle will not be steered until the front axle has passed through the straight-ahead position.
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When manoeuvring close to kerbstones or when travelling through narrow passages, there is a risk of tyre damage.
In such cases, engage the steering lock.
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Telligent® trailing axle steering lock switch
Disabling steering of Telligent® trailing axle
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Turn the vehicle key to the drive position in the ignition lock.
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Press the upper section of Telligent® trailing axle steering lock switch.
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The indicator lamp in the switch lights up.
The electronic management system automatically sets the wheels in straight-ahead position and locks steering of the Telligent® trailing axle.
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Enabling steering of the Telligent® trailing axle
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Press the lower section of Telligent® trailing axle steering lock switch.
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The indicator lamp in the switch goes out.
The electronic management system enables steering of the Telligent® trailing axle.
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Raising the trailing axle more.
