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The hydraulic system of an automatic transmission serves four basic purposes: 1. Actuates clutches and brake bands by hydraulic pressure from the hydraulic slave circuits.
Figure 4-34.- Brake band operation.
3. Circulates the transmission fluid through a remote cooler to remove excess heat that is generated in the transmission and torque converter. 4. Provides a constant fresh supply of oil to all critical wearing surfaces of the transmission. The hydraulic system for an automatic trans-mission typically consists of the following. Pump Produces pressure to operate the clutches, the bands, and the gearsets. Lubricates the moving parts in the transmission. Keeps the torque converter filled with trans-mission fluid for proper operation. Circulates transmission fluid through the trans-mission and cooling tank (radiator) to transfer heat. Operates hydraulic valves in the transmission. |
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