Steering wheel yanking back and forth

Tires? Sometimes I get that when they’re brand new, don’t know why, once I pick up speed they balance out. After a couple weeks, goes away.

 

Did it shake before and after the alignment, if the rear ends weren't done you need to have them aligned?

 

Have you checked the king pins?

 

Have you checked the king pins?

 

The king pins are a component of the tractor front end. I am in an area where my data signal is really bad, otherwise I would try and post a diagram. Hopefully someone else will chime in.

 

To check the king pins just jack up one side at a time of the FT. end and stick the tire bar in the low hole in the wheel and rock it back and forth there should be no movement if you see it moving look for any slop in bearings or king pins? When the wheels are back on the ground get someone to shake the steering and ck a) tie rod ends for play and steering box arm to box for slop?