Are you sure that the pump is actually turning? Since you have had the pump off a couple of times already you might want to remove the steel hydraulic lines. Then hook up some clear plastic tubing to the inlet and outlet of the pump. Fill the tubing with hyraulic fluid, put the ends of the tubing in a bucket of hydraulic fluid and then turn the tractor over with the switch off so it doesn't start. See if the pump is actully pumping.
If the bypass valve inside the touch control unit is stuck then it will never allow the pump to build up pressure. When you move the touch control levers the unit detects that the rockshafts are not at the desired position. Once the rockshafts reach the desired postion an internal bypass valve opens and then just recirculates the fluid without building up much pressure. If the bypass valve isn't closing then you will never build up any pressure to move the rockshafts.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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