Hello, I have a Hyster S150A 15,000 lb capacity lift, had if for a few years with virtually no problems. Just recently, the power steering squeals very loudly when it reaches the end or near end of the turning radius, it also causes the steering column to bounce, feels like it is coming from the pump, it squeals louder turning to the right than to the left. it works, but looking at it, cannot figure why it's doing this. Filled the hydraulic up, checked the belts, everything seems to be in order. Anybody had this happen before? Any good place to start looking?