I have a Jinma 354 with the 4 cylinder motor, FEL and power steering 9both off the same pump). My Son was using it an allowed the Hydraulic fluid to get too low and the power steering quit. The FEL was very jumpy. We re filled the reservoir beneath the seat and the FEL works flawlessly now but the power steering still has not recovered. Is it a problem with the proportioning valve? Should I hand prime all of the components individually (ie remove hoses and fill with oil etc.) At a loss here and any help would be greatly appreciated.