Does the hydraulics work on any of the levers or only when a lever is pulled up but not down or down and not up?
The reason I ask, on the valve body there is a rod with small rocker arms that when a lever is pulled, it turns the rod. The rod then activates a small micro-switch. Sometimes the rocker levers get out of adjustment and wonít activate the little micro-switch. The micro-switch kicks on the solenoid(s) to switch on power to the pumps.
In addition to pnybergís comments, Iíve had the brushes wear out on the motor(s) and then you have nothing.
Do you have a standard HD mill or a Super? With a Super, you can have one motor or solenoid go out and still have half power, but on a standard mill, youíll have nothing.
How many hours are on the mill? I've had to replace the brushes in the motor(s) on our mill at about 1,000 hours and then about 500 hours thereafter.