Mercedes-Benz Zetros 2020 Operating Instructions Manual page 141

X
Switch off all electrical consumers (e.g.
radio, blower).
X
At outside temperatures below −20 † and
on vehicles with an auxiliary heater (auxiliary
heater for cab and engine, 9 kW): preheat
the engine with the auxiliary heater before
starting the engine (
X
At outside temperatures below −32 † on
vehicles with a coolant preheater: preheat
the engine using the coolant preheater for
at least 90 minutes.
X
Switch the ignition lock to the drive posi-
tion.
X
Observe the outside temperature shown in
Y
the display ( page 68) and watch out for
signs of low on-board voltage, e.g. the vehi-
cle lights are weak.
X
Shift to neutral.
X
Disengage power take-off (
X
Start the engine.
In vehicles with automated manual trans-
missions, the clutch is opened automatically
at temperatures of −5 † or below in order
to make it easier to start the engine.
X
Release the Start/Stop button once the
engine has started.
The idling speed is controlled automatically.
If the engine does not start:
X
Switch the ignition lock to position 0.
X
Repeat the starting procedure after approx-
imately one minute.
X
After three starting attempts, wait approx-
imately three minutes before trying again.
X
If the reservoir pressure in the brake system
Y
( page 78) has fallen below six bar, charge
the compressed-air system (
This ensures that the clutch opens when
starting the engine in vehicles with automa-
ted manual transmission.
Driving in extremely cold conditions
Observe the following at outside temperatures
below −20 †:
Before pulling away, check the reservoir
R
pressure in the brake system (
Do not pull away until there is sufficient res-
ervoir pressure.
Before pulling away, check that the steering
R
is sufficiently warm. Only then is the operat-
ing efficiency of the steering ensured.
Y
page 61).
Y
page 141).
Y
page 186).
Y
page 78).
Winter operation
Hydraulic steering operation may be restric-
ted at outside temperatures below −25 †.
Shift gear early and avoid high engine
R
speeds.
Avoid putting the engine under excessive
R
load when pulling away.
Avoid running the engine for brief periods.
R
Warm the vehicle up for around 20 minutes
R
before increasing the strain on the engine.
For technical reasons, the engine brake is
R
only available from an oil temperature of
15 † at level 1.
The full engine braking effect is only availa-
ble across the entire engine speed range
from an oil temperature of 60 †.
The battery can only be charged at a certain
R
rate per hour, regardless of the power out-
put of the alternator. The rate of charge is
significantly reduced by low outside temper-
atures. As a result, the battery may take
much longer to charge in winter.
Parking in extremely cold conditions
If the vehicle is parked at outside tempera-
tures below −32 †, it cannot be guaranteed
that the engine will start, even with the cold
climate package. Mercedes-Benz advises
against parking the vehicle outdoors at outside
temperatures below −32 †.
Observe the following if the vehicle is parked
outdoors at extremely low temperatures:
X
If necessary, ensure adequate vehicle light-
ing by using external lighting, e.g. warning
lamps.
X
Check the fuel level on the fuel gauge
Y
( page 68).
X
If the fuel level is down to the reserve level,
fill up the fuel tank (
i You may have to bleed the fuel system if
the fuel level is too low for long periods
Y
( page 175).
X
If the vehicle is not driven for long periods:
charge the batteries every 2 days.
or
X
Remove batteries and store them at a tem-
perature above 0 †.
Observe the additional instructions and infor-
Y
mation on batteries (
Y
page 127).
page 170).
Z
139