Sounds like it needs bled. It's a PITA but it has to be bled well to get all the air out of all the stages. Or it will be bouncy.

Also if the internal packing on the piston are wearing out it can cause leveling issues as the moves past the internal packing. Are the stages perfectly in sync and staying that way?

Even a working Bucher valve is junk. It could be over complicated electrical issues (valve control board not working right). Quality valves only have 4 solenoids. Regardless, is the valve adjusted well? One solenoid variable voltage controlled valves are the most finicky valves. Savarias aint worth the 2 cents you'd get for them at the scrap yard.


Have you ruled out other mechanical issues at the top? Stick slip? Tight or sticky rails?

I'd rule out stick slip and other mechanic issues, make sure they are bled well, not a packing issue, rule out the selector if you need to and if all else fails sell the customer a maxton or Blain valve.