Note: The steering system and the brake system use the same hydraulic oil filter.
Steering Oil Filter
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| Illustration 1 | g00100285 |
Location of the Oil Filter for the Steering and Braking System | |
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| Illustration 2 | g00669350 |
Oil Filter for the Steering and Brake System (1) Filter bypass switch (VIMS). (2) Filter housing. (3) Oil inlet passage. (4) Oil outlet passage. (5) Filter element. | |
Pressure oil from the oil pump flows into filter housing (2) through oil inlet passage (3). During normal operation, the oil flows through filter element (5) to oil outlet passage (4). The oil then flows through oil outlet passage (4) to the remainder of the braking system. The filter element stops any debris that is in the oil.
Correct maintenance recommendations must be followed in order 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 (2). 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 cause damage to other components in the hydraulic system.
The filter bypass switch (1) is monitored by the Vital Information Management System (if equipped). When the filter element is plugged, oil pressure in filter housing (2) increases. This causes the filter bypass switch (1) to move to the OPEN position.
The Vital Information Management System (VIMS) will display either a Warning Category 2. A Warning Category 2 indicates that the filter has been plugged for more than thirty seconds. The operator needs to notify the shop.
For additional information on the VIMS, refer to Service Manual, SENR6059, "Vital Information Management System".
Note: The oil will also bypass the filter element during cold start-up conditions when the oil is below 52 °C (125 °F). 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 will allow the oil to flow through the filter element unless the filter element is plugged.
Case Drain Filters (If Equipped)
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| Illustration 3 | g00341532 |
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| Illustration 4 | g00625480 |
Left Side of Compartment (1) Case Drain Filter for the Implement Pump (Fixed Displacement). (2) Case Drain Filter for the Brake Pump. (3) Case Drain Filter for the Steering Pump. | |
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| Illustration 5 | g00669182 |
Case Drain Filter (Typical Example) (4) Filter bypass switch (VIMS). (5) Filter housing. (7) Oil inlet passage. (6) Oil outlet passage. (8) Filter element. | |
The case drain filters remove any debris that is in the hydraulic oil. The case drain filters also prevent contamination between the various systems. Contaminated oil is prevented from returning to the hydraulic tank.
During normal operation, the oil flows through filter (8) to oil outlet passage (6) .
Correct maintenance recommendations must be followed in order 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 (5). 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 cause damage to other components in the hydraulic system.
The filter bypass switch is monitored by the Vital Information Management System (if equipped). When the filter element is plugged, oil pressure in filter housing (5) increases. This causes the filter bypass switch (4) to move to the OPEN position.
The Vital Information Management System (VIMS) will display either a Warning Category 2. A Warning Category 2 indicates that the filter has been plugged for more than thirty seconds. The operator needs to notify the shop.
For additional information on the VIMS, refer to Service Manual, SENR6059, "Vital Information Management System".
Note: The oil will also bypass the filter element during cold start-up conditions when the oil is below 52 °C (125 °F). 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 will allow the oil to flow through the filter element unless the filter element is plugged.
High Pressure Screens (If Equipped)
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| Illustration 6 | g00669316 |
High pressure screen (1) for the steering pump. | |
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| Illustration 7 | g00669209 |
High Pressure Screen (2) Oil outlet passage. (3) Passage. (4) Passage. (5) Oil inlet passage. (6) Screen housing. (7) Screen assembly. (8) Drain Plug. | |
The screens for the hydraulic system filter any debris that is in the hydraulic oil. The screens prevent a debris generating failure from contaminating the oil that is in the hydraulic system.
During normal operation, the oil flows through screen assembly (7) to oil outlet passage (2) .
Correct maintenance recommendations must be followed in order to ensure that the screen assembly does not become plugged with debris. If the screen assembly is plugged, the flow of oil to the high pressure system stops. The oil will not bypass the screen if the screen assembly is plugged.