Which circuit can be used to raise or boost main or control pressure?

Which circuit can be used to raise or boost main or control pressure?

• A. throttle or modulator
• B. lubrication
• C. converter-out
• D. governor

Answer: (A)

Raising or boosting main or control pressure is done by the throttle or modulator circuit. When the throttle opens wider, the hydraulic pump moves more fluid, and the system pressure increases to meet demand. The modulator works in tandem with engine conditions to set the required pressure for control circuits, effectively boosting the pressure available to the main system when more power is needed. Lubrication is about delivering oil to bearings and gears to reduce wear, not increasing hydraulic pressure. Converter-out refers to the torque converter’s output, not a circuit for raising pressure. The governor primarily controls engine speed, which can influence pressure indirectly, but it is not the mechanism used to actively raise or boost the main or control pressure.

Raising or boosting main or control pressure is done by the throttle or modulator circuit. When the throttle opens wider, the hydraulic pump moves more fluid, and the system pressure increases to meet demand. The modulator works in tandem with engine conditions to set the required pressure for control circuits, effectively boosting the pressure available to the main system when more power is needed.

Lubrication is about delivering oil to bearings and gears to reduce wear, not increasing hydraulic pressure. Converter-out refers to the torque converter’s output, not a circuit for raising pressure. The governor primarily controls engine speed, which can influence pressure indirectly, but it is not the mechanism used to actively raise or boost the main or control pressure.