The ______ filter, commonly used on suction or return lines, is similar in appearance to a pressure line filter but cannot withstand the full pressure of the hydraulic system.

• A. Cartridge type filter
• B. Pressure line filter
• C. Spin-on filter
• D. Return line filter

Answer: (A)

Filters used on suction or return lines are typically cartridge-type. The cartridge design fits inside a housing and uses a replaceable filter element, which makes it well-suited for low- to moderate-pressure paths like suction or return lines. Although it can resemble a pressure-line filter in appearance, it isn’t built to withstand the full hydraulic system pressure, so the cartridge-style filter protects the pump and components where pressure is lower without risking failure from the high-pressure main line. In contrast, a true pressure-line filter is designed to endure the system’s full pressure, and a spin-on style is simply a mounting/assembly choice that can be used in various locations, while the term “return line filter” refers to location rather than construction.