Two technicians discuss the manual selector valve. Technician A says it directs fluid pressure to the forward clutch and to the neutral/forward regulator circuit when reverse is selected. Technician B says it directs fluid pressure to the fourth clutch circuit in neutral or any forward range. Who is correct?

Two technicians discuss the manual selector valve. Technician A says it directs fluid pressure to the forward clutch and to the neutral/forward regulator circuit when reverse is selected. Technician B says it directs fluid pressure to the fourth clutch circuit in neutral or any forward range. Who is correct?

• A. Technician A
• B. Technician B
• C. Both Technician A and Technician B
• D. Neither Technician A nor Technician B

Answer: (D)

The manual selector valve acts as the pressure-routing switch for the transmission, directing hydraulic pressure to the correct clutch circuits based on the current gear. In reverse, the valve routes pressure to the reverse circuit and does not simultaneously feed the forward clutch or a forward regulator circuit simply because reverse is selected. In neutral, the valve isolates the clutch circuits so no drive clutches are pressurized. The fourth clutch is used in the gear that engages it, not in neutral or in every forward range. Because the valve’s function isn’t described by either technician’s statement, neither is correct.

The manual selector valve acts as the pressure-routing switch for the transmission, directing hydraulic pressure to the correct clutch circuits based on the current gear. In reverse, the valve routes pressure to the reverse circuit and does not simultaneously feed the forward clutch or a forward regulator circuit simply because reverse is selected. In neutral, the valve isolates the clutch circuits so no drive clutches are pressurized. The fourth clutch is used in the gear that engages it, not in neutral or in every forward range. Because the valve’s function isn’t described by either technician’s statement, neither is correct.