ALTERNATOR GP-CHARGING 4316995 - Caterpillar

Illustration 1 g03316921
Location of the power train oil filter
(1) Power train oil filter
(2) Bypass switch
(3) Pressure test port for the transmission fluid
(4) Fluid sampling port for the transmission fluid There is one oil filter for the power train oil. Oil filter (1) for the power train is located in front of the fuel tank on the left side of the machine. Oil filter (1) is equipped with bypass switch (2). Oil from the transmission charge pump section flows to power train oil filter (1) through the inlet of the filter.During normal operation, the oil flows through the filter elements. The oil flows from the element to the outlets.If the filter element becomes full of debris, the restriction to the flow of oil causes the pressure to increase. The increased pressure triggers bypass switch (2) and the oil then can bypass filter (1). When the oil does not flow through the filter element, the debris that bypasses the filter in the oil will damage the other components in the power train system.Use correct maintenance in order to make sure that the filter element does not become full of debris. If the filter element is full of debris, the flow of clean oil to the power train system is stopped.Reference: Refer to Operation and Maintenance Manual, SEBU8718, "Torque Converter and Transmission Oil - Change - and Torque Converter/Transmission Oil Filter - Replace" for instructions on changing the power train oil filter.Reference: Refer to Operation and Maintenance Manual, SEBU8718, "Oil Filter - Inspect" for instructions on inspection the oil filter.Transmission Charge Filter Bypass Switch
Illustration 2 g01405358The bypass switch is a pressure switch that shows whether the filter is plugged. If the filter is plugged, the switch bypasses the filter. The switch is normally open. When electrical power is applied to the switch, the switch closes. When the filter becomes plugged, the pressure of the oil opens the switch which allows the oil to bypass the filter.The switch is one of the inputs that is used to drive the system indicator on the instrument cluster. The indicator is turned ON when the "Transmission Filter Bypass" switch is in the closed position and the temperature of the transmission oil is greater than 50° C (122° F) with the engine running.