DirtyHoe
Senior Member
If you flip the wheel motor speed switch it powers up a solenoid valve that sends a signal to all four drive motors to change the position of the swash plate inside the motors changing the displacement as they're variable displacement motors, which again will change the speed of the drive motors.
I don't think there is any electrical wires down to the individual motors, so this "signal" is fluid to the four motors?
Since my PQ controls seem to be original and quirky I'm going to buy a new one to see how it behaves compared to my old ones. Maybe this will help troubleshoot?
I'm just amazed at how much technology is crammed into this machine compared to my backhoe and skid steer. It's a much bigger challenge to repair.