Starting and running
OPM 300 en-GB 33
© Scania CV AB 2020, Sweden
Belt transmission
When the belt transmission is new, it may make
a squeaking noise when running. This noise is
normal and disappears after 50-100 hours of op-
eration. The noise does not affect the service life
of the belt transmission.
Raised idling speed on engines with
SCR and EGR system
If the engine is run without load for an extended
period of time, the SCR system needs to be heat-
ed by raising the idling speed. The function is
called periodic hydrocarbon evaporation and is
used to avoid damaging the SCR catalytic con-
verter.
Periodic hydrocarbon evaporation functions dif-
ferently depending on how the engine is
equipped. A warning is output for all engines if
the engine needs to be warmed up. The warning
is output after approx. eight hours if the engine is
idling without load and the outdoor temperature
is 20°C (68°F). The time is reduced as the out-
door temperature becomes colder.
For some engines, a request for automatic raising
of the idling speed is also output after the warn-
ing. If the request is confirmed, the idling speed
is raised automatically. The function is active for
45 minutes or less and is deactivated automati-
cally. If the request is not confirmed, the engine
is switched off after approx. 45 minutes, if the
engine has been configured with engine shut-
down.
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