I had a 354 and think the steering is the same. It's difficult to know for sure, but it sounds like the problem is in the steering box itself, not the hydraulics. The shaft that has the worm gear on it is held in place by caged ball bearings on the top and bottom of the worm. If those bearings self destroy (and they are kind of flimsy) the worm has a lot of space to float up and down. Pull up and push down on the steering wheel. There should not be any slack. Usually the culprit is a leaking output shaft seal loosing all the grease out of the steering box. If the box is ok, the problem could be in the directional valve, but it should still steer, just take more effort.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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