Determining Tyre Pressures - Mercedes-Benz Actros 2017 Operating Instructions Manual

Observe the recommended tyre pressure and
check the tyre pressure of all the tyres includ-
ing the spare wheel:
at least once a month
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when the load changes
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before embarking on a longer journey
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for changed operating conditions, e.g. off-
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road driving.
If necessary, correct the tyre pressure.
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WARNING
The tyre temperature and pressure increase
when the vehicle is in motion. Reducing the
pressure of warm tyres leads to a tyre pres-
sure that is too low when the tyres have
cooled. If the tyre pressure is too low, it may
cause the tyre to burst, especially when the
load or speed increases. There is a risk of an
accident.
You should never reduce the pressure of
warm tyres. Observe the specified tyre pres-
sure.
For every 10 † change in air temperature, the
tyre pressure changes by around 30 to 40 kPa
(0.3 to 0.4 bar/4.4 to 5.8 psi). Bear this tem-
perature-related change in tyre pressure in mind
when checking tyre pressures indoors, where
the temperature may be higher than the outside
temperature.
Example:
room temperature is approximately 20 †.
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outside temperature is approximately 0 †.
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set the tyre pressure to around 60 to 80 kPa
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(0.6 to 0.8 bar/8.7 to 11.6 psi) above that
prescribed in the tyre pressure table.
The tyre pressures are specified according to
E.T.R.T.O. standards and may deviate from the
manufacturer's specifications.
Also observe the general notes in the "Operating
and road safety" section (
Before starting your journey, check the speci-
fied tyre pressures while the tyres are cold.
If the tyre pressure is too low, it leads to:
excessive build-up of heat in the tyres
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increased tyre wear
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Y
page 402).
altered driving stability
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increased fuel consumption
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Excessive tyre pressure leads to:
an increased braking distance
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a deterioration in tyre traction
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increased tyre wear
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The valve caps on the tyre valves protect the
valve cores from moisture and dirt. Always
screw the valve caps tightly onto the tyre valves.
In the event of repeated pressure loss in the
tyres, external damage or leaking tyre valves
may be the cause. Check the condition of the
tyres regularly.

Determining tyre pressures

! Correct the tyre pressures for each axle on
the vehicle.
Example: tyre size and load bearing index
X
Read off tyre size : and load bearing
index ; on the tyre.
If load bearing index ; is comprised of two
numbers, the first number before the "/" is for
single tyres and the second number, after the
"/", is for twin tyres.
Example: permissible axle load
Tyre pressures
Z
405