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It's most likely the air governor like rusty and the other fellas said. The drag link component of the AIR O MATIC should have a line exiting from it that's roughly 1 inch dia. Coiled wire and fabric hose. It will hiss when you reach full lock when turning. Mine was bypassing just enough...

My Air O Matic was bypassing air out of the exhaust port. My truck would not build air past about 50 psi. I couldn't hear it while to truck was running. To get it to stop I would cut the air supply to the Air O Matic let the truck build pressure to 120 then open the valve to charge the steering...