ok gary,
they do make service lifts for forklifts, just do some googling and you can find them. I found one called Excalibur Forklift Service Lift at a website mhwmag.com (you should be able to google that and it will give you a link to it). FLA is funny about links here so it probably won't show up.
Now that lift is designed for mainly forklifts up to a certain capacity, not sure about pallet jacks though, those are a bit more tricky when lifting.
Just about any material handling company that sells lifts should be able to get you one of these.

Now if you're just talking about a jack to jack them up off the floor a bit to do service then also, you can get a jack at any of those same places, or your forklift dealer. Totalsource and SMH both have good jacks.