Steering wander and Chinese parts?
10.9 is a metric bolt grade and is considered equivalent to Grade 8 but not identical. Source the correct bolt and replace it. You might check your idler arm ID and see if it is for 9/16". Here is the kicker, I've seen SAE graded Metic bolts, So I wouldn't be surprised to see a ISO Imperial threaded bolt.
It was difficult to find the spec of a 9/16 SAE bolt, my Machinery's Hand Book goes from 1/2 to 5/8 but what little I could find suggested the un-threaded shank can be .5545" to .5625"
If you continue to have wander after replacement, look to the steering coupler at the box. They are known to wear out and can be rebuilt but even then check it, my dad had to shim the housing on his to get it tight and still functional.
10.9 is a metric bolt grade and is considered equivalent to Grade 8 but not identical. Source the correct bolt and replace it. You might check your idler arm ID and see if it is for 9/16". Here is the kicker, I've seen SAE graded Metic bolts, So I wouldn't be surprised to see a ISO Imperial threaded bolt.
It was difficult to find the spec of a 9/16 SAE bolt, my Machinery's Hand Book goes from 1/2 to 5/8 but what little I could find suggested the un-threaded shank can be .5545" to .5625"
If you continue to have wander after replacement, look to the steering coupler at the box. They are known to wear out and can be rebuilt but even then check it, my dad had to shim the housing on his to get it tight and still functional.