Not familiar with the '98 in particular, but:
Normally a power steering pump has an internally threaded shaft. The
intent here is you put a nut and a washer on a bolt. You thread the
bolt into the shaft (the washer is between the shaft and the nut). Then
you turn the nut to press the pulley onto the shaft. You're never
pressing on the pump body.
That said, I took a look at an '05 FSM I have on hand, and it warns that
the pulley is not intended to be reused; if you change pumps you need to
replace the pulley as well. I don't know if that's also the case for
A suggestion: buy a Factory Service Manual. That way you'll have the
factory recommendations for these things.
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