New Holland Workmaster 50 Operator's Manual page 133

2. Remove the outer element (3). from the air cleaner as-
sembly by gently twisting the end of the filter clockwise
to disengage the seal. Then pull the filter straight out
of the housing, not at an angle.
NOTICE: Do not disturb or remove the inner element.
3. Make sure the inner element (4) remains in place.
4. Clean the outer element using either method A, or
method B, depending on the element's condition.
NOTICE: The outer element may be dry cleaned (methods A or B ) every 300 h or when warning bulb glows (which
ever is earlier). The outer element should be replaced after four cleanings or maximum of 1200 h. The inner element
should be replaced when the outer element is replaced or every 1200 h
7 - MAINTENANCE
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