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On no account re-use damaged car-
tridges. If in doubt fit a new cartridge.
Safety cartridge
When the main cartridge is being serviced
the safety cartridge remains in the filter
housing. The engine must not be run with-
out the main cartridge.
Safety cartridges must be neither cleaned
nor re-used.
Safety cartridges must be changed:
D at the latest after being in use for two
years
D if, after the main cartridge has been
serviced (changed), the contamination
gauge responds again immediately
D if the main cartridge is defective
When the main cartridge has been re-
moved the safety cartridge is accessible
and can be removed also.
Remove the hex nut.
Pull out the safety cartridge.
Insert a new safety cartridge. Refit and
tighten the hex nut.
Maintenance and care
Viscous air cleaner
The maintenance intervals for filters de-
pend on the respective operating condi-
tions.
As soon as a distinct layer of dust has
accumulated on the filter element, remove
air cleaner and wash in fuel or cleaning
oil.
Shake element out thoroughly to dry it.
Uniformly coat filter surface with a thin film
of engine oil.
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