No power steering?

Alright, short version. I went to go get some flex pics on a short little trail near my house. 4wd and everything worked fine. I get about 5 minutes off of the trail and make a left turn and it felt like I had no power steering. It does that for the rest of the way home. When I got near my house I stopped and restarted it to see if that would do anything, nope. Also, I see no leaks from anywhere? I just don't get it. Any help would be appreciated. Here is a pic of my steering setup. Its just stock pretty much....

If you need any other information about the Jeep just let me know. Thanks.

bump, and I am pretty sure my pump went out. Anyone have any other ideas though? Thanks.

More than likely the pump, Mine just did the same thing last week on the trail, bolted on another pump and alls well. I'm going to be adding a pump cooler this time, most everyone on this board will agree it's a good idea, the pumps seem to get very hot and leads to poor performace and failure

Pump cooler? Never heard of those....do you have any links I can read up on those? Yea, hopefully I can find someone who is open tomorrow who has a pump so I can throw it in tomorrow.