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| Illustration 1 | g00288387 |
Components of the oil filter (1) Bypass valve (2) Spring (3) Filter element (4) Outlet passage (5) Inlet passage (6) Base (7) Filter housing | |
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| Illustration 2 | g00288388 |
Location of the oil filter and the priority valve (8) Pressure switch (9) Oil filter housing (10) Priority valve | |
Oil from the pump goes through the priority valve body and into filter base (6) through inlet passage (5). The oil goes through the filter base to filter housing (7). Oil fills the space between the inside of filter housing (7) and filter element (3). Normally, oil goes through the filter element then to the outlet passage. The oil then goes to the remainder of the power train oil system. The filter element 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 increase in pressure causes bypass valve (1) to open. The oil then goes to the power train oil system. When the oil does not go through the filter element, the oil is dirty and the debris in the oil can cause damage to components in the power train oil system.
Correct maintenance procedures must be followed in order to ensure that filter element (3) does not become full of debris which will stop the flow of clean oil to the power train oil system.
Bypass valve (1) will open and pressure switch (9) will turn on a light on the CMS panel in the operator's compartment in order to indicate a plugged oil filter element.