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| Illustration 1 | g06576927 |
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Oil filter components (1) Bypass valve (2) S·O·S port (3) Inlet passage from pump (4) Switch (5) Outlet passage (6) Temperature sensor | |
Pressure oil from the pump goes into the housing assembly through inlet passage (3). The oil flows into the space between the filter housing and the filter element.
During normal operation, the oil flows through the filter element and out through passage (5). The filter element stops most 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. The increase in pressure will force bypass valve (1) to open. The oil bypasses the filter and flows directly to outlet passage (5).
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When the oil does not go through the filter element, the debris in the oil damages other components in the hydraulic system. |
Correct maintenance must be used to make sure that the filter element 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.
When a fluid filter is full of contaminants to the designed capacity, the filter is called plugged and dirty lubricant will bypass the filter. The dirty lubricant will flow through the system without cleaning. If there is a restriction in the oil filter or if the oil viscosity is high, the bypass valve in the filter housing will open. The cracking pressure for the bypass valve is