I have a 48'' z. All of a sudden the steering controls are very harsh. This happened between yards all at once. I've looked and every thing seems to be connected. The control arms seem to be almost loose(but are not) and they flop to the out side position with no resistence. The mower runs fine but is very hard to control. It has 450 hrs on it. I checked the hydro fluid and it was ok also. If you could point me in the right direction I would be grateful. Thanks Harvestman.