Page 341 - Catalog filters BALDWIN for tractors

Auto Parts / FILTER CONSTRUCTION

Not all filters have the same parts inside, but this
page shows components of a typical spin-on
(starting on the inside and working out).

BY-PASS VALVES
All full-flow lube systems
require a by-pass (relief) valve
to permit oil to flow to the
bearings even when cold oil is
CENTERTUBE too thick to flow through the
Spiral wound, louvered filter. The valve also opens
centertube forms the center of when the filter becomes
most non-air filters. The filtering plugged. If not located in the
media is placed around this engine system, there must be
centertube. On larger filters, a a by-pass valve in the filter. (It
reinforcement or centering guide can be both places, providing
is sometimes added. the one in the spin-on opens
at the same or higher pressure
than the one in the system.)
PLEATED FILTERING MEDIA ANTI-DRAINBACK VALVE
Used in most “surface type” The position of the installed
filters where contaminants filter determines the need
are trapped on the surface. for this valve in a filter. This
The greater the surface, keeps the oil from draining
the greater the capacity. from a filter when the
Baldwin uses more than sixty engine is shut off. (If the
different media, depending filter hangs downward from
on the application. the base or “dome end
down,” this valve is not
needed, but would cause
no problems if included.)
ELEMENT END CAPS
End caps (of metal, plastisol BASEPLATE AND
or paper) are bonded to the SEAMING COVER ASSEMBLY
filtering media to prevent
unfiltered liquid from by- The baseplate is attached
Closed End to the seaming cover and
passing (going around
instead of through) the the seaming cover is
media. Some elements are attached to the can. Be
constructed with two open sure the gasket on the
Open End ends. Others have one open baseplate seals with
mounting surface when
and one closed end.
you install a spin-on filter.
SPIN-ON FILTER CAN
COMPRESSION SPRING
You change spin-on filters
Holds element in place to make quickly because there is no
sure the element seal remains housing to clean. The entire
R
intact. unit is changed each time.
339 / Auto Parts

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