What are the two primary adjustments for rack-and-pinion steering gear?

The two primary adjustments for rack-and-pinion steering gear focus on ensuring that the system operates smoothly and effectively while maintaining appropriate clearances and bearing pressures. The correct choice highlights the importance of pinion bearing preload and rack support.

Pinion bearing preload is crucial because it controls the tension on the bearings that support the pinion shaft. Proper preload ensures that there is minimal play in the steering mechanism, which enhances steering precision and response. If the preload is too loose, it can lead to excessive slop in the steering, while too much preload can result in increased wear and can make steering feel heavy or stiff.

Rack support adjustment involves ensuring that the rack is adequately positioned and supported within the housing, which prevents undue wear and maintains the correct alignment with the pinion gear. Proper alignment is essential for smooth, responsive steering and prolongs the life of the components within the rack-and-pinion system.

In summary, choosing pinion bearing preload and rack support as the two primary adjustments highlights their roles in maintaining the integrity and functionality of the steering system.