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| Illustration 1 | g06303017 |
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Transmission lubrication relief valve (A) Ports to the transmission case (B) Passage from the transmission hydraulic control (1) Spring (2) Spool | |
The transmission lubrication relief valve is located in the selector and pressure control valve. The selector and pressure control valve is located in the valve stack for the transmission hydraulic control. The transmission lubrication relief valve controls the maximum pressure of the lubrication oil that is flowing to the transmission. Lubrication oil for the transmission comes from oil that is flowing by the pressure relief valve for the transmission charging system. Lubrication oil is then supplied to the transmission.
When oil from the transmission charging section of the transmission gear pump reaches the relief setting, some oil will pass through the pressure relief valve. This oil will then drain to the sump. If the pressure of the lubrication oil in the transmission lubrication relief valve overcomes the force of spring (1), spool (2) will shift. This action will allow passage (B) to drain lubrication oil through ports (A) into the transmission case. The oil in the transmission case will drain to the sump.