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| Illustration 1 | g00646729 |
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(1) Transmission lubrication relief valve
(2) Spool (3) Spring (4) Ports to the transmission case (5) Passage from the transmission hydraulic control | |
The transmission oil cooler bypass valve (1) is located after the relief valve for the transmission hydraulic control. Transmission oil cooler bypass valve (1) controls the maximum pressure of oil that is flowing through the hydraulic oil cooler. When the oil from the transmission charging section of the transmission gear pump reaches the relief setting, oil will pass through the pressure relief valve for the transmission charging system. The oil is then routed through the transmission cooler to the lubrication circuit. If the pressure of the oil in the transmission oil cooler bypass valve overcomes the force of spring (3), spool (2) will shift. This will allow passage (5) to drain oil through ports (4) into the transmission lubrication circuit.