Force Motor

Force motor solenoid has a spool valve and operates pressure regulator valve. See Figure. The computer sends a frequency signal to the force motor to regulate hydraulic line pressure. The frequency signal (duty cycle) is measured with a dwell meter or lab scope. When the duty cycle is zero, line pressure is at maximum, and force motor draws zero amp. When the duty cycle is 40%, line pressure is at minimum, and force motor draws 1.1 amps at 4-5 volts.