I am not remembering any tricks with removing pump from the rest of the unit.....................but it has been 20 years.
The one trick I do remember is the front seal were the steering lever pushes. The seal is in an aluminum insert. Cat has tool to pull the insert. But a piece of 3/8 all thread (??) and flat washers will get the job done.
Cat service manuals can leave out some parts they assume you know out, but still help a lot if you have one.
Thanks guys