John Deere 8450 Hydraulic Noise
My new to me JD 8450 has a hydraulic noise when the tractor warms up. The noise goes away when turning the steering wheel or running a scv but returns right after the steering wheel or scv isn't moved.
Checked with previous owner and he said noise has been there for almost ever.
He changed the Relief valve in hydraulic pump and no difference. I have changed both hydraulic filters, oil level is perfect and have had the hydraulics pressures checked and the system checks out.
Any ideas on how to fix this problem?