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| Illustration 1 | g01902654 |
(1) Differential oil filter | |
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| Illustration 2 | g01902656 |
Differential oil filter (1) (2) Filter bypass switch (3) Oil pressure sensor | |
Differential oil filter (1) is mounted on the right side on the back of the rear axle housing. Oil from the center section of the rear axle cooling pump flows through the inlet line to differential oil filter (1). Oil then flows through the outlet line back to the differential bearings.
Filter bypass switch (2) sends input signals to the Brake/Cooling ECM. The Brake/Cooling ECM sends the signal to the Vital Information Management System (VIMS), which informs the operator if the filter is restricted.
Proper oil flow to the bevel gear bearings must be maintained at all times. When the vehicle operates at high speed, the oil flow to the bearings may be diminished. This will cause the bearings to rapidly overheat.
Differential oil filter (1) is an in-line bypass type of filter. When the oil is cold or when the filter element is plugged, the oil will bypass the filter element. This will cause the bevel gear bearings to receive unfiltered oil.
Oil pressure sensor (3) is located on the filter housing. The pressure sensor also provides an input signal to the Brake/Cooling ECM. The Brake/Cooling ECM sends a signal to the VIMS, which informs the operator if the differential oil pressure is low.
Note: Oil samples can be taken at the Scheduled Oil Sampling tap on the final drive oil filter, as the differential oil filter and the final drive oil filter share a common sump.
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| Illustration 3 | g01902695 |
Section view of differential oil filter (7) Bypass spool (8) Spring (9) Outlet (6) Inlet (5) Element (4) Housing | |
Oil from the inlet line flows into inlet (6). This oil fills the space that is between element (5) and the inside of housing (4). During normal operation, the oil flows through element (5). The oil then flows through outlet passage (9). Element (5) stops any debris that is in the oil.
If the filter element becomes full of debris, the restriction to the flow of oil causes a pressure increase inside the filter. If the pressure of the oil achieves the bypass pressure, the pressure oil causes bypass spool (7) to move against the force of spring (8). The oil then goes through open bypass spool (7). Filter bypass switch (2) notifies the Brake/Cooling ECM of this occurrence. When the oil does not go through element (5), the debris that is in the oil may cause damage to the other components in the system.
Correct maintenance must be used to ensure that element (5) does not become full of debris and that the flow of clean oil is not stopped.