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Technician A says an automatic transmission will still operate in reverse without mainline pressure. Technician B says the torque converter hub usually drives the pump gears in an automatic transmission. Which technician is correct?

Question

Technician A says an automatic transmission will still operate in reverse without mainline pressure. Technician B says the torque converter hub usually drives the pump gears in an automatic transmission. Which technician is correct?

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Solution

Technician A is incorrect. Mainline pressure is crucial for all operations of an automatic transmission, including reverse. Without it, the transmission would not be able to engage any gears, including reverse.

Technician B is correct. In an automatic transmission, the torque converter hub is typically connected to the engine's crankshaft, and it does indeed drive the pump gears. The pump then generates the hydraulic pressure needed to operate the transmission.

So, only Technician B is correct.

This problem has been solved

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