I have a 1949 Oliver Row Crop 88 that I recently installed a No. 3 Hydra-Lectric Hydraulic Unit on. After installing it, I attached a hydraulic cylinder to the left side ports and found that both ports were pressurized at all times, even with the controls in neutral. I then disconnected the cylinder and installed it on the right side ports. The cylinder worked on the rights side until I plugged the left side ports. I now have all the ports under pressure at all times. To try to correct this problem, I replaced the O-Ring seals in the interlock assembly. Unfortunately I did not have the square lip o-rings, so I used regular o-rings. I reinstalled the controls and tested the unit. It still pressurizes all the ports even with the control in neutral. Does anyone have any idea why this hydraulic unit will not control flow? Any information on correcting this problem will be greatly appreciated.

Thank You
Bill Wiley
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