CEMB USA DWA 1000XLB - Manual (Page 41)

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9.5 - (truck) Adjust the parallelism between the two front steering axles
In the case of trucks equipped with two front steering axles, at the end of the adjustment procedure you
are asked to position the four measuring heads on the two front steering axles to adjust the parallelism
between the direction of the fi rst and the second front steering axle.
Adjust the parallelism of the two steering axles taking care not to excessively steer the wheels; in this case
a warning will be displayed.