I noticed a leak today at my power steering resvoir the hose that puts fluid in the unit that goes to a metal pipe my question is i dont want to break it because i dont know how it is held on if someone could tell me i would appreciate it and what other procedures should i do. oh the car is the basic 91 740

I'd get a hose or a complete unit from the junkyard.
These almost never fail, and are always on the cars when they crush em.
I'm sure if you find one of these cars in a junkyard, it'll have one on it.
Probably don't want to know what Volvo gets for the hose, but FCP Groton, Volvoworld and otehr advertisers here sell OEM parts for a LOT less.

You will need a good set of wrenches to get anything apart on the PS system- fittings are TIGHT and access is usually lousy. Metric flare nut wrenches are the best solution but not 100% necessary.
Good luck with it.
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Rob Bareiss, New London CT ::: '87 244DL/M47- 225K, 88 744GLE- 209K, 91 244 183K. Also responsible for the care and feeding of: 88 745GLE, 229K, 88 244GL, 146K, 87 244DL, 235K, 88 245DL, 236K