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420 steering vibration

3.9K views 8 replies 3 participants last post by  drozment  
You might want to go through the front axle mount and the wheels spindles where they go into the axle, there are bushing that can wear out. Mine where worn out after 30 years in my 318. Could be also for the 420. Also check the yoke on the steering cylinder for excessive play. If that is worn others here have cut off welded a new one on the cylinder, the PS cylinder is expensive to replace as a whole.

Also you could have some air inside the system yet, best to run it around a bit making turns both full left and right, then check the site glass in the rear.
 
Did you go through the creep adjustment? That has some part in the jumpiness issue. There are 4 versions of the control linkage system, which version do you have?

Now that you have taken care of the other issues that affect steering, it looks like the other bad news is that you will have to pull the steering valve and do tear down and rebuild.