When sufficient shims have been removed, by turning the steering wheel it will be noticed that at one position, near the centre, a "high spot" will be felt for about one or two inches of movement of the rim of the steering wheel, and on either side of this "high spot" it will again become free. If the clearance is again tried at the end of the drop-arm, it will be noticed that at either side of this "high spot" the amount of clearance gradually increases until it reaches its maximum at the extreme ends. The cam is purposely made like this because the amount of wear on a steering gear is not uniform, more wear taking place in the centre than at the ends, and if, after wear, the gear is adjusted so that no backlash is evident in the centre, it would be too tight at the ends. By making the cam with a definite and permissible clearance at the ends, however, it is possible to adjust the gear with very little clearance in the centre position.
IF THE REMOVAL OF SHIMS HAS ELIMINATED BACKLASH AT THIS EXACT SPOT WITHOUT ACTUALLY CAUSING THE GEAR TO BIND, THEN THE GEAR IS CORRECTLY ADJUSTED.
Always endeavor to share, if you like this post. An automobile mechanic who loves to blog on mobile device.