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Operation
264
X
Depress the accelerator pedal past the pres-
sure point to the stop.
The automatic transmission shifts down to a
lower gear depending on the engine speed.
X
Ease off the accelerator pedal slightly once
the desired speed is reached.
The automatic transmission shifts up again.
Driving on uphill and downhill gradients
!
If you have restricted the shift range, make
sure that the engine revs do not enter the red
danger zone in the rev counter. Exceeding the
limiting speed for longer periods can result in
engine damage.
When driving on extreme uphill gradients or long
downhill gradients, shift to a shift range with
high engine performance and engine braking
effect in good time.
Manoeuvring and rocking free
Manoeuvring in a tight space:
X
Control the vehicle's speed by measured
application of the brakes.
X
Depress the accelerator moderately and
steadily.
You can shift back and forth between drive
i
position h and reverse gear k at low
speeds without applying the brakes. This
helps when manoeuvring rapidly or when
rocking the vehicle out of snow or slush, for
example.
Operation
Hydrodynamic clutch
General notes
The hydrodynamic clutch (turbo retarder clutch)
assists you when pulling away and braking (pri-
mary retarder).
The oil temperature increases when you drive in
hydrodynamic clutch mode. If the oil tempera-
ture is too high, an event window is displayed
and a warning tone sounds. Shift to a lower gear
to decrease the oil temperature.
If the event window and warning tone persist:
X
Brake the vehicle and stop, paying attention
to road and traffic conditions.
X
Apply the parking brake.
X
Shift into neutral.
X
Let the engine run at approximately
1,200 rpm for approximately 1 minute.
X
If the event window and the warning tone per-
sist: have the hydraulic clutch checked at a
qualified specialist workshop.
Pulling away
General notes
You should primarily use the automatic operat-
ing mode when pulling away. The Mercedes
PowerShift transmission system automatically
determines the optimal gear and shift point.
Depending on the driving resistance, the dry
clutch opens or closes.
You can pull away at low engine speeds with
maximum torque (approximately 1,200 rpm).
Only when the manoeuvring mode is switched
on can the vehicle crawl forward automatically
and coast after the service brake is released
Y
(
page 265).
i
The transmission does not change gear
when driving in clutch mode.
Level ground
X
Select a gear.
X
Depress the accelerator pedal and release
the parking brake.
The X indicator lamp in the instrument
cluster lights up.
The hydrodynamic clutch is filled and the vehi-
cle pulls away. After pulling away, the X
indicator lamp in the instrument cluster goes
out and power is transmitted via the dry
clutch.
Gradients
How the vehicle pulls away depends on:
the gradient of the road surface
R
the gross tractor/trailer combination weight
R
how quickly you depress the accelerator
R
pedal
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