What method is commonly used to adjust the bearing on many transaxle input shafts?

The commonly used method to adjust the bearing on many transaxle input shafts is the use of selective shims. This approach involves placing shims of varying thickness under the bearing to achieve the desired fit and clearance. By adjusting the number or thickness of these shims, technicians can ensure proper bearing preload and alignment, which are crucial for optimal operation and longevity of the transaxle.

Selective shimming is particularly effective because it allows for precise customization based on the specific requirements of the transaxle being serviced. This method provides a reliable means of achieving a tight yet smooth fit, minimizing the risk of wear or damage due to misalignment.

Other methods considered may not provide the same level of precision or flexibility. For example, while locking nuts can secure components, they do not allow for fine-tuning of bearing position. Washers, on the other hand, can provide spacing but lack the specific calibration benefits that shims offer. Using a hydraulic press might be necessary for some assembly tasks, but it doesn't facilitate the adjustment of bearing clearances in the same way selective shims do.