 | |
| Illustration 1 | g01115282 |
(1) Filter Element (Transmission) (2) Filter Element (Torque Converter) (3) Bypass Valve (Transmission) (4) Spring (5) Bypass Valve (Torque Converter) (6) Spring (7) Filter Housing (8) Outlet (Transmission) (9) Inlet (Transmission) (10) Pressure Tap (Transmission Outlet Pressure) (11) Filter Base (12) Oil Sampling Port (13) Outlet (Torque Converter) (14) Inlet (Torque Converter) (15) Filter Housing (16) Pressure Tap (Torque Converter Outlet Pressure) | |
The power train oil system contains the following two power train oil filters:
- Transmission Charge Filter
- Torque Converter Charge Filter
The transmission charge pump sends oil to the transmission charge filter. The torque converter charging pump section sends oil to the torque converter charge filter.
Oil from the transmission charge pump enters filter base (11) at inlet (9). 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 (1). Normally, oil goes through the filter element and the oil leaves the filter base through outlet (8). Filter element (1) prevents debris from going to the transmission hydraulic control.
If the filter element becomes full of debris, the restriction to the flow of oil causes a pressure increase. The increase in pressure causes bypass valve (3) to open against spring (4). Then, the oil will flow directly from inlet (9) to outlet (8). A bypass switch sends a signal to the power train ECM in the cab in order to alert the operator that the filter element is plugged. The power train ECM will then activate a light on the operator console.
Oil from the torque converter charging pump section enters filter base (11) at inlet (14). The oil goes through the filter base to filter housing (15). Oil fills the space between the inside of filter housing (15) and filter element (2). Normally, oil goes through the filter element and the oil leaves the filter base through outlet (13). Filter element (2) prevents debris from going to the torque converter.
If the filter element becomes full of debris, the restriction to the flow of oil causes a pressure increase. The increase in pressure causes bypass valve (5) to open against spring (6). Then, the oil will flow directly from inlet (14) to outlet (13). A bypass switch sends a signal to the power train ECM in the cab in order to alert the operator that the filter element is plugged.
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 the filter element does not become full of debris which will stop the flow of clean oil to the power train oil system.