You have the classic symptoms of a worn out MCV pump or a leak between the pump and steering. The TA lube light should have come on also. The steering gets 3 GPM priority flow from the MCV pump that is regulated to about 250 PSI for brakes and TA control. When the steering id being used the pressure in the steering circuit is limited to 1900 - 2100 PSI. If due to wear or leakage the pump cannot put out pressure in excess of the steering relief valve setting there will be no oil flow for the clutch assist, brakes, TA control, or hydraulic seat. Since the TA lube is oil that has passed the pressure regulator setting, if there is not oil for the controls there is no oil flow for the TA lube.
What doesn't show up but can be more critical is the excess flow from the MCV pump that exceeds the 3 GPM that goes to the steering, goes to the oil cooler and then to lubricate the range transmission and differential. When ever you notice problems with the controls or steering, the lube for the rear of the tractor has already been cut off. That is why it is important to keep the MCV circuit in good repair.
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