in a non-solenoid machine...it used a reversing motor to control wash and spin....the motor did not run while filling, instead of solenoids to engage, they used a helix unit on the agitation pulley to engage the agitator, when reversed the linkage released the agitator, and then spin began, still a fluid drive, but remained neutral during washing direction, when the motor reversed, this caused the fluid drive to engage, and ramp up to full speed.....the only drawback is it had to pause between reversing, where the solenoids shifted into gears from one to the next without stopping.......
and odd enough, it pumped out water during wash and spin, no matter what direction the motor was going...