1566 hydraulic issues

1975 1566 doing weird things with hydraulics. Sometimes the work well with engine about 1000 rpm or above. Then after about 5 mins of runtime, the steering quits altogether (not even manually. The wheel won't even turn. ) front blade won't raise or lower, three point acts funny, and ta quits working. If I shut it down and wait 5 mins, it will work but the cycle repeats itself. When it works, blade will lift tractor off the ground and will not leak down. Ta works fine when the issue is not happening. So does the three point. Hyd fluid is very milky, but full. Thanks. A.P.
 
Start by changing the oil and filter. Might even have to change it a second time to get the water out. After that take the cover off under the clutch. With a light look up at the center of the pressure plate if the shaft is not turning or the rivets that hold the hub to the pressure plate are sheared you have just found your problem.
 

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