My 231 is doing the exact same thing, I noticed when I was using it was hard to turn both ways. I changed the filter (it was completed stopped up) and it got a little better but still hard I called the dealer and he told me the pump was probally damaged because it over heated with the filter stopped up. Put a after market pump on and now with it jacked up it does the same thing your is turning left easy back to center it basilly stops when you try to go to the right. Both cly were changed about a year a ago because of leaking bought from Massey. checked them and they were ok. I took apart
the streeing valve it looked fine cleanded it real good and reinstalled does the same thing. so I ordered another should have it today. I will let you know if that fixed the problem. Let know what you found on yours