The O.P. stated he is able to drive the tractor, which proves the transmission pump is functioning at least well enough to engage the PermaClutch and the quad range planetary two-speed (IF so equipped). As part of the troubleshooting procedure it will be necessary to determine for SURE that there's enough excess flow to feed the main hydraulic pump.
Also, there's a POSSIBILITY of a huge internal ''leak to sump'' of the output of the main hydraulic pump.
One REALLY needs a copy of the factory service manual and follow the diagnostic tree found there to get to the bottom of what's going on with certainty.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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