...keep rpms up or else I will loose lose all hydraulics, no clutch, no shifting, no brakes, no steering...<<

Isn't this a dead give away for a bad transmission supply pump? located in the front pump of the powershift?
OR, restricted intake (filters), bad/leaking o-ring on the pickup? these type things...?

Or is it too hot here today, I don't know these things like I think I do?? Lol

Good Luck,
CF