Preload bearings apply constant pressure to rolling elements in motor assemblies to reduce play.

https://harvest-single-bb8.notion.site/Improper-storage-conditions-can-degrade-the-quality-of-bearings-before-installation-moisture-exposu-29a9edfbc38c80fa88e0cee67148e041?source=copy_link

Preload bearings apply constant pressure to rolling elements in motor assemblies to reduce play, ensuring smoother performance under varying loads.