I agree with JD seller that you need check trans pump pressure which should be IIRC 165 psi.
Since you stated pto shut down "at slow engine speed" I'm not that concerned about trans pump output being the culprit.
Another common problem place on JD utility tractors of that era is leaking rockshaft control valves. With 3 pt raised engine running look in hyd filler hole for spraying hyd oil.
This post was edited by Tx Jim at 08:42:38 04/05/15 2 times.
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