Hello, I received helpful advice here the last time I had a problem so I am back again. I have a Hitachi Zx140W-3 (HPV 118 Hydraulic pump ) the pump is Producing 340 bar of pressure at hydraulic pump 1 and only 260 bar of pressure at Hydraulic pump 2, this is accompanied by a cavitation whine, I plan to remove the hydraulic pump from the machine shortly to inspect . Does anybody have any other suggestions or test I should carry out before removing the pump? Any help greatly appreciated.
What are the pump1 and pump2 control pressures ?
I don’t know the exact figures. I do know that there was a difference in them when I Checked on the monitor . I’ll check out the exact figures on Monday.
Pump 1 Delivery pressure : 33.5 MPa Pump 1 control pressure : 1.90 MPa Pump 2 Delivery pressure 24.4 MPa Pump 2 Control pressure 2.50 MPa These readings were taken when holding back the the boom up fully.