COVER 9H9867 - Caterpillar

Illustration 1 g02573416
View of the Case Drain Filter for the Left Steering Pump (A) Filter bypass switch. (B) Case drain filter.The Vital Information Management System (VIMS) refers to the case drain filter for the left steering pump as "LT STRG CDRN ST". The VIMS refers to the case drain filter for the right steering pump as "RT STRG CDRN ST".
Illustration 2 g02573436
Case Drain Filter for the Steering Pump (1) Filter bypass switch. (2) Inlet passage. (3) Outlet passage. (4) Filter. The case drain filters for the steering pumps filter any debris that is in the hydraulic oil. The filters prevent debris from the steering pumps from contaminating the oil that is in the hydraulic tank for the steering and brake systems.During normal operation, the oil flows through filter to oil outlet passage .Correct maintenance recommendations must be followed in order to ensure that the filter element does not become plugged with debris. If the filter element is plugged, the flow of filtered oil to the system stops. However, unfiltered oil will flow past the bypass valve. This oil will then flow to the hydraulic tank. When the oil does not flow through the filter element, the debris in the oil could damage to other components in the hydraulic system.When the filter element is plugged, the pressure of the oil in passage increases. This action causes the filter bypass switch to move to the OPEN position. Filter bypass switch (1) is monitored by the Vital Information Management System (VIMS). The VIMS will display either a Warning Category 2 or a Warning Category 3. The warning notifies the operator that the filter element is plugged.A Warning Category 2 indicates that the filter element is becoming plugged with debris. A Warning Category 3 indicates that the filter element has been plugged for a time that is greater than 2 minutes. Shut down the machine safely.For additional information on the VIMS, refer to Service Manual, RENR6318, "Vital Information Management System (VIMS)".Note: The oil will also bypass the filter element during cold start-up conditions when the oil is cold. In this case, the VIMS will not display a warning. As the oil warms up, the bypass valve will move to the CLOSED position. This action will allow the oil to flow through the filter element unless the filter element is plugged.