New Holland SmartTrax T8.320 Service Manual page 38

Blow-by recirculation
Blow-by is controlled by a rotary filter bolted to the rear of
the camshaft. As the cam turns excess oil is thrown off by
centrifugal force, finer oil is filtered out.
The blow-by then passes through the center of the
camshaft and exits at the front.
This filter must be replaced at regular intervals or the en-
gine will build up excessive pressure in the crank case.
Built into the cover at the front is a valve that allows
blow-by pressures out, but will not allow atmospheric
pressure into the crankcase.
This filtered air is directed back into the inlet and
re-burned.
Engine - Engine and crankcase
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