Loader hissing noise when lowering FEL

[benitez]

After using tractor for a while, noticed a hissing noise when lowering the FEL on one side only. After letting it cool down, noticed the hissing not as loud. Anyone know what this could be?

 

[KennyV]

That hissing is likely coming from the control valve, and it is the normal sound of oil going through small openings...