How do you adjust steering free play on a 1994 mack truck?

The steering free play doesn't adjust.. if you have free play in your steering, you have a component worn out somewhere, and it needs to be replaced. Check the u-bolts on the steering column, check the drag link, tie rods, pitman arm, and spring pins for slack, check the steering pump and gearbox, determine which is the faulty component, and repair or replace it.