SHIM (Long) 8S4674 - Caterpillar

Illustration 1 g02691596
Oil Filter Components
(1) Spring
(2) Bypass valve
(3) Filter element
(4) Housing
(5) Oil inlet passage
(6) Oil filter base
(7) Oil outlet passage
Illustration 2 g02691698
Oil filter is located on the left side of the cab platform
Oil flows into filter base (6) through inlet passage (5). The oil goes through the filter base to housing (4). Oil fills the space between the inside of housing (4) and filter element (3). The oil flows through the filter element and outlet passage (7). The oil then flows to the remainder of the hydraulic system. The filter element stops any debris that is in the oil.If the 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 (2) to open. The oil then flows to the hydraulic system. When the filter element is dirty, the oil does not flow through the filter element. Debris in the oil that does not flow through the filter element can damage some of the other components in the hydraulic system.The bypass switch is mounted in the base of transmission oil filter (6). Normally, the end of bypass valve (2) is in contact with the bypass switch. When the bypass valve opens, the valve moves away from the bypass switch. The contact between the bypass valve and the switch is broken.Bypass valve (2) moves away from the switch plunger when the bypass valve opens. The switch plunger moves away from the switch contacts. The switch plunger then opens the circuit indicating that the filter element is plugged and that the bypass valve is open. If the bypass valve is open for 30 seconds, a Warning Category 2 will appear on the Advisor display. If the bypass valve is open for 2 minutes, a Warning Category 3 will appear on the Advisor display.The warnings occur only when the oil in the system is at normal operating temperature.