CHECK GEARBOX.

Measure the sliding resistance of the gearbox.

or

QUESTION

Is the sliding resistance of steering gearbox less than 400 N (41 kgf, 90 lbf)? Is the difference between the right and left sliding resistances less than 20%?

Yes No

Steering effort is normal.

Readjust the backlash, and if ineffective, replace the faulty parts.