550 Hydraulics

We have a 550 Oliver that hydraulic fluid bubbles out the breather. What are some of the causes? The three point works. Could it be caused by rear tires that are over sized. We have 18.4 X 26 tires on the rear. Seems like the issue started when the tires were installed. Give me some possible causes and things to check. We use this tractor daily to clean a cattle barn. Thanks in advance and hope your New Year is happy.
 
If you have foaming happening you need to check for internal high pressure leak. I am guessing you checked to see if the level was not low. If your level is low, maybe the larger tires raked the angle
enough for the pick up to suck in air. Just an idea.
 

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