What defect or misadjustment in the steered wheel system can the instability of the steering of a heavy vehicle while driving be attributed to?

Question

DentroTest · Accepted Answer

The kingpin inclination angle (the inward inclination of the pivot axis of the steering knuckle) is essential for the steered wheels to tend to return by themselves to the straight line after a turn, to hold a stable path and to reduce the effort at the steering wheel. If it is not within the manufacturer's values, or differs between the two sides, the vehicle tends to drift and the steering becomes erratic and unstable. By contrast, a poorly adjusted toe-in usually results above all in premature and uneven wear of the tread, and the steering knuckle is a pivoting support that has no gear mechanism of its own, so play in that supposed gear assembly is not the cause.

What defect or misadjustment in the steered wheel system can the instability of the steering of a heavy vehicle while driving be attributed to?

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