Poor road or wind conditions

Test drive the vehicle on a flat road.

Test drive the vehicle in both directions.

Misaligned front wheels

Align the front wheels to specifications.

Unbalanced steering gear valve.

If the steering gear valve is unbalanced, the steering effort will be very light in the direction of the lead and heavy in the opposite direction.

Replace the steering gear valve.

The steering shaft is rubbing the I.D. of the shaft tube.

Align the steering column.

Worn or faulty tires

Replace the tires.

Low tire pressure

Adjust the tire pressure.