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 - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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