Technician A says typically when the pump pressure acting on the spool valve becomes greater than the spring pressure, the regulator spool valve moves slightly, opening an exhaust port, and excess fluid pressure is exhausted back to the transmission pan. Technician B says typically when the pump pressure acting on the regulator spool valve becomes greater than the spring pressure, the spool valve moves slightly, opening an exhaust port, and excess fluid pressure is exhausted back to the torque converter. Who is correct?

Question

Quizplus · Accepted Answer

Technician A is correct. In automatic transmissions, when the pump pressure exceeds the spring pressure on the regulator spool valve, it opens an exhaust port to release excess fluid pressure back to the transmission pan, not the torque converter.

Technician a Says Typically When the Pump Pressure Acting on the Spool