hello, Newbie here hunting some help. I have a 135 Diesel that has broken 3 power steering wear blocks. I have ordered a new one from this site but id like some help on whats causing them to break.The blocks have all been cast and not steel. When these things break the steering just sticks and wont turn. Its also 500 to get it fixed. My mechanic is a factory trained Massey mechanic and he says he has no idea what causing them to break. If anyone here could offer some help I sure would appreciate it and maybe could stop this before it happens again, And Im pretty sure its gonna happen again. Thanks in advance, Jack