US Patent 8425769 Filter arrangement and methods

A filter arrangement includes a filter cartridge having a first filter element and a second filter element. The first filter element includes a first tubular section of filter media extending between first and second end caps and defining a first open filter interior. The second filter element includes a second tubular section of filter media operably oriented in the first open filter interior. The second tubular section of filter media extends between third and fourth end caps and defines a second open filter interior. The first end cap defines an inner container and an outer container circumscribing the inner container. The outer container is secured to the first tubular section of filter media. The inner container has an end wall axially spaced from the outer container. The third end cap has a media end secured to the second tubular section of filter media and a tubular wall axially extending from the media end. The tubular wall is circumscribed by the inner container of the first end cap. The filter arrangement further includes a housing for the cartridge, and can be either a spin-on or a bowl-cartridge filter. The filter arrangement is usable in a hydraulic system including a sump; an implement valve; a pump; and a filter head in fluid communication with the sump, implement valve, pump, and filter arrangement.