HOUSING AS 7E9780 - Caterpillar

Pump Case Drain Oil Screen
Illustration 1 g06059306
(1) ScreenThe case drain oil screen removes potential debris from the hydraulic oil returning to the tank.Correct maintenance recommendations must be followed to ensure that the screen does not become plugged with debris. If the screen becomes plugged, oil flow draining from the pump case will be restricted.Hydraulic Oil Filter (Oil Cooler Return)
Illustration 2 g06059446
(2) Hydraulic tank
(3) Hydraulic filter
(4) Oil cooler
(5) Sampling port
(6) Oil cooler inlet pressure
(7) Brake system tank return line
(8) Implement system tank return line
(9) Steering system tank return lineThe hydraulic oil filter removes debris from the hydraulic oil.During normal operation, oil flows through the oil inlet passage to the oil outlet passage of the filter.Correct maintenance recommendations must be followed to ensure that the filter does not become plugged with debris. If the filter is plugged, the flow of filtered oil to the system stops. However, unfiltered oil will flow past the bypass valve which is located inside the filter housing. When the oil does not flow through the filter element, the debris in the oil may damage components in the hydraulic system.When the filter element is plugged, oil pressure in the filter housing increases. This pressure causes the filter bypass switch to move to the OPEN position.The implement ECM will display a Warning Category 2. A Warning Category 2 indicates that the filter has been plugged for more than 30 seconds.Hydraulic Oil Filter (Brake and Pilot)
Illustration 3 g06059683
(2) Hydraulic tank
(10) Pilot Filter
(11) Oil filter bypass
(12) Gear pumpThe hydraulic oil filter removes debris from the hydraulic oil.During normal operation, oil flows through the oil inlet passage to the oil outlet passage of the filter.Correct maintenance recommendations must be followed to ensure that the filter does not become plugged with debris. If the filter is plugged, the flow of filtered oil to the system stops. However, unfiltered oil will flow past the bypass valve which is located inside the filter housing. When the oil does not flow through the filter element, the debris in the oil may damage components in the hydraulic system.The filter bypass switch is monitored by the implement ECM. When the filter element is plugged, oil pressure in the filter housing increases. This pressure causes the filter bypass switch to move to the OPEN position.The implement ECM will display a Warning Category 2. A Warning Category 2 indicates that the filter has been plugged for more than 30 seconds.Note: The oil will also bypass the pilot filter element during cold start-up conditions when the oil is cold. In this case, the graphical display will not display a warning. As the oil warms up, the bypass valve will move to the CLOSED position. With the bypass closed, oil flows through the pilot filter element unless the pilot filter element is plugged.