Why does the fixed track Goldacres self-propelled turn so cleanly?

Goldacres fixed track Crop Cruisers have a mechanical steering link (tie rod) which can be adjusted for correct wheel alignment and optimal tyre life. This mechanical link also allows proper steering Ackerman angle for clean headland turning. When track adjustment is fitted to a sprayer a hydraulic link replaces the tie rod. This does not allow the accurate alignment of a tie rod and requires frequent re-phasing. Also because the Ackerman angle is not the same over different track settings, correct turning angles are compromised.

Ackerman Steering Principal – The alignment of the king pin to the steering arm connection must follow to the centre line of the rear axle. This alignment will change with different wheel tracks.