Hi all.
I am running a Mach3 Flow waterjet with a Hyplex Prime 3000 hp pump.
It started dropping pressure from 360 mpa all the way down to its low pressure setting of 103mpa. I have done a complete change to the PCV unit, replaced all seal as well as several poppet and seats.
I have replaced the proportional valve as it seems to not even attempt the high pressure. you turn on and it gradually works its way up to the low pressure setting perfectly, when selecting high pressure there is nothing, not even a slight increase or sound.
I am hoping someone has had this before.

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