Originally Posted by Wet_Boots
All rotor heads have bearings, and high pressure can't be any great benefit to them. Maybe overpressure wears bearings, and increases bearing friction. Reducing pressure would then reduce the forces that rotate the head, possibly to a point of non-rotation.
I'm sorta leaning that way. The high pressure wore the original bearings out, and ,when the the pressure was reduced, guess what? The system was over- zoned and failed.
I have no problems with rotors at 90 psi, but the design must reflect it.