If I didnt know better, I would swear this is my tractor! I have a 2000 M6800 we bought used at 1200 hours, about 3 years ago. Its been a hard worker with no complaints.
This spring, in a space of about 3 weeks, three of the four hydraulic cylinders on the boom and bucket began leaking. I tore them down and all seals were seriously deteriorated, even though it worked fine. I'll tear the fourth one down when I get a chance.
What I did notice, however, was the fluid was milky, not the amber-clear I am used to. I added about a gallon of universal oil since I lost quite a bit during the cylinder overhaul.
When I put it back to work again (shredding), about 3 hours into it, foamy fluid blew out of the dipstick boot. I washed everything down and put it back to work.
Today, while shredding about 3 hours, the power steering went completely out. The FEL works fine (LA1001). The oil appears to be full but the dipstick has about 1/8" of milky stuff on the bottom.
I dont know where its coming from, or where to drain it. I dont have any service manuals. I am a retired auto instructor, hydraulics and repairs dont scare me too much.