hitachi ex200 3 wabco

help trying to make this think work been going on for nearly 2yr its not much worse then when i started looking back should of converted to hyd on sqaushplate but thought 10yr old 9000hrs would not have to replaced wiring out of china found afault whith it bought ec pvc out china nowork now got second hand ones out of a 300 hitachi sem to work dont seem to be getting any signial to solienionds on main pump bought palm reader out china apart from it being in chinese and the wires dont look like fitting so now iam planning my next big move would rrealy apreciate any help reguards wabco