1900 Hydralic issues.

[slushpup]

So just like everyone else, got a great deal on a 1900 with a loader and back hoe. Original owner stated that the Hydraulics needed to be flushed and even had a new unopened J20A 5 gallon jug to go with it. Oil was super milky as they only used to to plow their driveway. So... dumped oil and cleaned the screen filled and it got better for awhile, then started chattering again. Online searching seemed vauge as to weather the J120A was the correct oil so I dumped and flushed again then used TSC traveler which states it is 134D, which is the replacement for 134-134A tractor ran so good after this I greased everything changed the engine oil and dug up a few rocks with the backhoe and leveled the driveway with the bucket. Now I back to chattering. Oil is clean so is the filter. So Pump? Flush it again for giggles? I do hear a slight whine now where I didn't before. And I don't know how the bypass works or its location but when I rack the backhoe on its stops I get the louder bypass whine. Also problem goes away when cold, takes 1/2 hour to reappear. Thanks guys, Plenty of experience with trucks, boats, and snowmobiles but this is my first tractor