TM 5-2410-241-23-1
0009
PRIMARY POWERTRAIN CONTINUED
Oil Filter (powertrain)
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Pressure oil from the pump goes into the housing assembly through the inlet passage (Figure 14, Item 2). The oil
flows through the passage (Figure 14, Item 1) in order to fill the space between the inside of the housing assembly
and the filter element. The oil also flows through passage (Figure 14, Item 10) in order to fill chamber (Figure 14,
Item 8).
During normal operation, the oil flows through the filter element and out through passage (Figure 14, Item 4) to
outlet passage (Figure 14, Item 3). The oil then travels to the transmission main relief valve and the brake control
valve. The filter element stops any debris that is in the oil. The springs (Figure 14, Item 6) force the bypass valve
spool (Figure 14, Item 7) to the left.
If the filter element becomes full of debris, the restriction to the flow of oil causes a pressure increase inside
chamber (Figure 14, Item 8) and a pressure decrease in the chamber (Figure 14, Item 5). The pressure oil that is in
the chamber (Figure 14, Item 8) can now force the bypass valve spool (Figure 14, Item 7) to move to the right
against the force of the springs (Figure 14, Item 6). The oil is then allowed to flow from the passage (Figure 14,
Item 10) through the passage (Figure 14, Item 11) to the outlet passage (Figure 14, Item 3).
When the bypass valve spool (Figure 14, Item 7) is shifted to the right, this allows the switch (Figure 14, Item 9) to
open. The switch informs the ECM that the filter element is being bypassed.
When the oil pressure increases above the bypass valve setting of 50 3 psi (345 21 kPa), the oil bypasses the
filter element.
C AU T I O N
When the oil does not go through the filter element, the debris in the oil causes damage to
other components in the hydraulic system.
Correct maintenance is necessary to make sure that the filter element does not become full of debris. A filter
element that is clogged with debris will stop the flow of clean oil to the hydraulic system.
Figure 14. Oil Filter Components.
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