Which hydraulic pressure provides a load signal to the control valve body?

• A. Governor pressure
• B. Main pressure
• C. Modulator pressure
• D. MPRV pressure

Answer: (C)

The load signal to the control valve body comes from the modulator pressure. This pressure is designed to reflect engine load and throttle demand, feeding the valve body so it can adjust hydraulic pressures and shift behavior accordingly. As engine load increases, the modulator pressure rises, signaling the valve body to change pressures and timing for optimal performance.

Governor pressure varies with engine speed and is used for speed-related control, not load signaling. Main pressure is the overall hydraulic supply, not a load-specific signal. MPRV pressure is tied to a relief valve function, not the load signal.