A bearing puller is a tool used to remove bearings from a shaft or housing. Bearings are used in a variety of mechanical applications, and they can wear out over time, requiring replacement. A bearing puller is typically used when a bearing is stuck or difficult to remove by hand.

The basic design of a bearing puller kit consists of two or three arms that can be adjusted to fit around the bearing. The arms are attached to a central screw or bolt that is turned with a wrench or ratchet to apply pressure and pull the bearing from its seat. Some bearing pullers also come with attachments for pulling gears, pulleys, or other components.

To use a bearing puller, first, loosen any retaining clips or bolts holding the bearing in place. Position the arms of the puller around the bearing, making sure they are snugly seated against the inner or outer race of the bearing. Turn the central screw or bolt with a wrench or ratchet to apply pressure to the arms and pull the bearing from its seat. If the bearing is stubborn and won't come out, additional pressure may be required, and it may be helpful to use heat or lubrication to loosen it.