If it is that pressure switch, you can check to see what happens by bypassing the switch by shorting the wires together.
Is the power steer motor running? when they sit on the seat and chose a direction?
Does the contactor for the power steer motor move freely and have good tips?
I seem to remember this unit having a permanent magnet power steer motor, have you taken a good look to insure the magnets in the motor are in good shape and not broken?
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