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| Illustration 1 | g06078216 |
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Filter 777E series truck (1) Inlet (2) Outlet (3) Oil sampling valve (4) Bypass switch (5) Pressure test port (6) Charge filters for the transmission | |
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| Illustration 2 | g01250137 |
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Filter 777F series truck (1) Inlet (2) Outlet (3) Oil sampling valve (4) Bypass switch (5) Pressure test port (6) Charge filters for the transmission | |
Charge filters for the transmission (6) are on the right side of the frame assembly behind the front wheel.
Oil from the transmission section of the hydraulic tank flows to the transmission gear pump. The transmission charging section of the pump sends oil to charging filter (1).
Oil flows through inlet passage (1). The oil fills the space inside the housing and the element. During normal operation, the oil flows through the element and out outlet passage (2) to the transmission hydraulic control. The element stops any debris that is in the oil.
If the element becomes full of debris, the restriction to the flow of oil cause a pressure increase inside the housing. The pressurized oil activates bypass switch (4) and an alarm is registered in the cab.
The oil then flows past the open bypass valve and to the transmission hydraulic control. When the oil does not flow through the element, the debris in the oil will damage other components in the transmission system.
Use correct maintenance to make sure that the element does not become full of debris. If the element is full of debris, the flow of clean oil to the transmission system is stopped.