My 5252 is starting to have a strange hydraulic problem. Over that past year I have noticed that when I first start the tractor, the power steering was stiff and making a noise whenever I turned the wheel. Similar to the noise a power steering pump makes in a car when its turned all the way to the stop. After the tractor warmed up the steering got better and the noise stopped. Now when I put the FELoader on it shimmies and shakes when I try to lift it or tilt the bucket. Is this all related to a hydraulic pump? Is the hydraulic pump separate from the Hydrostatic pump? All filters and hydro oil changed on schedule and oil is full.