My brother-in-law has a Jetstar he has had trouble with over the years with the power steering. At first it would turn easy to the right and not to the left. Now when he starts turning to the right and it dang near Rips the steering wheel out of his hand. And when it comes to the end of the travel it lugs down the engine.He has bypass the power steering and just uses Armstrong steering. He uses the Tractor frequently so he s getting kind of sick of it not working properly. he has tried to adjust it but he thinks he just made it worse. Are there parts available for this or does he have to try and find a used one? He seems to think it might be the actuating lever. Is this a common problem? And is it repairable?