Hi @ladykayak1966 ,
Here’s the [https://cardiagn.com/1998-nissan-quest-model-v40-series-service-repair-manual/|1998 Nissan Quest Service Repair Manual]
Click on ''Contents: Steering.''
When you have the file on the screen (select Fullscreen to make it easier to see and use) go to p.ST-22 onwards to view how to disassemble/reassemble the power steering pump.
The others sections of the manual, e.g. ''engine lubrication & cooling systems'' and ''engine mechanical'' will help you with the others.
There is a download icon at the right side end of the document header bar if you want to download it to your computer
Hopefully this is of some help.[br]