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226 Driving mode
Using fluid coupling
The fluid coupling (turbo retarder clutch) provides
support when pulling away and braking (primary
retarder).
The oil temperature rises when the vehicle is
driven with the fluid coupling in clutch mode. If
the oil temperature is too high, an event message
is displayed and a warning tone sounds.
Shift to a lower gear to reduce the oil temper‐
#
ature.
If the event message and the warning tone do not
go out:
brake and stop the vehicle, taking into
#
account the road and traffic conditions.
Apply the parking brake.
#
Shift the transmission to neutral position.
#
Leave the engine running at about 1200 rpm
#
for about a minute.
If the event message and the warning tone do not
go out:
have the fluid coupling checked at a qualified
#
specialist workshop.
Pulling away
%
You should primarily use the automatic oper‐
ating mode when pulling away. The Mercedes
PowerShift gearshift automatically deter‐
mines the optimum gear and shift point. The
dry clutch opens or closes depending on the
motion resistance. At low engine speed, pull‐
ing away is possible with maximum torque
(about 1200 rpm). Only when manoeuvring
mode is switched on does the vehicle creep
forwards automatically and coast after the
service brake has been released
(
page 227).
/
%
The transmission does not change gears if
clutch mode is active when pulling away.
Level stretches
Engage a gear.
#
Depress the accelerator pedal and release
#
the parking brake.
The X indicator lamp in the instrument
cluster lights up.
The fluid coupling is filled and the vehicle
pulls away. After pulling away, the indicator
lamp X in the instrument cluster goes out
and power is transmitted via the dry clutch.
Uphill gradients
The pulling away behaviour depends on the fol‐
lowing points:
the gradient of the road surface
R
the gross combination weight
R
the speed at which the accelerator pedal is
R
depressed
Apply the parking brake or engage the hill
#
holder.
Switch on automatic operating mode. The
#
electronic management system changes
gears exactly and quickly.
Engage a gear.
#
Depress the accelerator pedal and release
#
the parking brake.
The X indicator lamp in the instrument
cluster lights up.
The fluid coupling is filled and the vehicle
pulls away. After pulling away, the indicator
lamp X in the instrument cluster goes out
and power is transmitted via the dry clutch.
Using hydromove
The hydromove drive function allows you to drive
down inclines slowly, in a controlled manner. The
vehicle can then be moved forwards or back‐
wards on an uphill gradient using only the accel‐
erator. This is particularly of benefit when operat‐
ing the vehicle with a trailer containing a heavy
load, as it is not necessary to change gear or
depress the service brake. To do this, a start-off
gear must be selected for the direction opposite
to your desired direction of travel. The drive func‐
tion is always automatically activated when you
start the engine. The drive function is only auto‐
matically deactivated in the offroad shift pro‐
gram.
The hydromove drive function can be activated or
deactivated in the multimedia system under the
Controls
menu and the Switch,
tems
menu item.
Stop the vehicle using the service brake.
#
Depress the brake pedal.
#
Activate the hydromove drive function in off-
#
road mode.
If you want to reverse down a gradient slowly:
#
turn the multifunction lever to
page 215).
/
h(
Assistance sys-
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