The steering on my 4120 works fine 90-95% of the time. The other 5-10% of the time, the steering won't turn left. The steering wheel will turns forever without stop. At anytime, I can turn right, and it works fine. This happens with the engine hot or cold, moving or at a standstill, a brushcutter on or off the 3 point hitch, and with a load in the FEL, or an empty FEL. It is a hydrostatic transmission model, and the hydrostatic/transmission fluid level is correct, and have not noticed any leaks.
I have clipped a few doorways, because of the loss of steering and it is starting to make me angry. Does anybody have a clue as to what it can be? Thanks.