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| Illustration 1 | g00301536 |
Oil filter components (1) Outlet passage. (2) Inlet passage. (3) Bypass valve. (4) Spring. (5) Filter element. (6) Housing assembly. | |
Pressure oil from the pump goes into the filter housing through inlet passage (2). The oil fills the space between the inside of housing assembly (6) and filter element (5).
During normal operation, the oil goes through the filter element and out through outlet passage (1) to the remainder of the hydraulic system. Filter element (5) stops any debris that is in the oil. If the filter element becomes full of debris, the restriction to the flow of oil causes a pressure increase inside the filter. The pressure oil fills inlet passage (2). The pressure oil then causes bypass valve (3) to move against the force of spring (4). The oil then goes past the open bypass valve and to the remainder of the hydraulic system.
When the oil does not go through the filter element, the debris in the oil will cause damage to other components in the hydraulic system.
Correct maintenance must be used in order to make sure that filter element (5) does not become full of debris. A filter element that is clogged with debris will stop the flow of clean oil to the hydraulic system.