Tractor Repair: tractor steering, tie rod ends, steering gearbox

Question
This pertains to a JD 850 tractor manufactured probably in the late 1980s. I am experiencing a bit of play in the steering wheel before engaging the tie rod and wheels. I understand that some play is acceptable and was hoping that you could tell me what an "acceptable" degree of free rotation might be. I am probably turning the steering wheel between 45 and 60 degrees before encountering resistance. Also, at higher speeds on relatively flat ground (roadways), I am also experiencing some significant "wobbling" of the front wheels when I go over small bumps and depressions. Are these two conditions related and what should I be looking for? I am not an experienced tractor mechanic but I am a fast learner with pretty good mechanical skills.

Answer
Hello,

  Yes, these things are related to each other.  45 to 60 degrees of free travel on the steering wheel is way too much.  There should only be enough play in it that you can just move the steering wheel very slightly before you feel resistance.  Probably only a couple of  degrees.  According to the info that I found, this model was available with and without power steering, so there could be different problems depending on what steering system you have. There is probably something worn out inside the steering gearbox, or worn tie rod ends or drag link ends.  Look at all the visible parts while someone rocks the steering wheel back and forth.  Replace any parts that have play in them.  If there is no play in the visible linkage parts, then the steering gearbox is either worn or needs adjustment.

                            Arnie