Excessive Wheel Kick Back or Free Play

Air in pump fluid system.
Worn poppet valve in steering gear.
Excessive over center lash.
Loose thrust bearing preload adjustment in steering gear.
Free play in pot coupling.
Steering gear flexible coupling loose on shaft, or rubber disc mounting nuts loose.
Coupling loose on worm shaft serrations.
Improper sector shaft adjustment.
Excessive worm piston side play.
Damaged valve lever.
Universal joint loose.
Defective rotary valve.
Ball studs or wheel bearings loose.
Steering gear loose on frame.