I've replaced an alternator without removing the PS pump. You need to remove the belt maybe, but not the whole pump.
If you are interested in removing PS to increase fuel economy you can do what johnlvs2run posted above, or do what I did:
Remove PS belt. Jack up the car, get an oil pan and put it underneath. Disconnect one of the PS lines let the fluid drain out. Not all fluid will come out, so you will need to sit in the car, turning the wheels side to side (fluid will spray out with steering pressure). Repeat until you no longer see fluid coming out.
Then simply reconnect the line and you are done. The power rack does not need fluid to "lubricate" it or anything, and removing the fluid makes steering much easier, similar to a manual rack. The power rack has a better steering ratio (less turns to tun the wheels) which is another benefit of just leaving it in the car.
This way everything is still in the car so if you ever decide to sell it or add PS back it's as simple as adding fluid and putting on the belt. That's the primary reason I did it this way, because I will sell the car one day and I don't feel like the effort removing the pump permanently has enough benefit.
I've driven my HX like this for thousands of miles without an issue. < 5 mph you can tell the difference, but other than that it's great. After a couple weeks you will wonder why these cars ever had PS.
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