Bearing pullers are necessary tools for maintaining bearings. Different types exist depending on the application, and it is crucial to get familiar with how to use them. This article will explain how to use a bearing puller, which is important to remember.
What is a bearing puller?
A bearing puller is one of the special tools used to remove bearings. It is a very useful tool used to replace bearings. There are various lineups of bearing pullers depending on the application. When dismounting the bearing, the most suitable puller should be selected from among them.
When considering machine maintenance, it is important to be aware that bearings, as consumable parts, also need to be replaced. Considering daily maintenance, it is advisable to know the basic usage of the bearing puller.
Select the most suitable bearing puller
When removing a bearing, it is essential to check the method of fixing the target bearing. There are three main types of fixing methods for the bearing.
- Fixing the inner diameter of the bearing
- Fixing the outer diameter of the bearing
- Fixing both the inner and outer diameters of the bearing
There are several types of bearing pullers. Select the most suitable one while carefully checking the fixing method.
For example, in the case of a tapered roller bearing, the inner ring is connected to the shaft, so a special bearing puller with a tip shape that can pinch the inner ring is more suitable than a bearing puller with a fixed inner diameter.
How to use the bearing puller
Let's take a look at how to pull out a bearing using a bearing puller. Here, we will show you how to use a pilot bearing puller set that can work according to the inside diameter of the bearing.
- Select a chuck that fits the inside diameter of the bearing and insert it all the way.
After inserting the chuck into the bearing, gently pull it up to make sure that the jaws on the end of the chuck are firmly seated on the bore of the bearing. If the chuck does not fit the bearing bore, select a new chuck.
- Insert the push bolt into the chuck and tighten it firmly using a wrench.
- Set the puller body on a flat surface. At this time, to avoid interference with the bearing diameter, spread the main body evenly on both sides and fix it firmly with the bolts.
- Insert the bolt of the main body into the push bolt.
- Turn the nut clockwise while fixing the body bolt with a hex wrench. Turn it slowly and carefully to pull up the bearing.
What to do if the bearing cannot be removed using a bearing puller with a fixed inner ring
Since the inner ring of a tapered roller bearing is connected to the shaft, it cannot be removed with a ‘bearing puller with a fixed inner ring’ that is normally used. Since there are many types of bearings, it is essential to select the correct bearing puller for each type in order to ensure proper dismounting.
For tapered roller bearings, remove the bearing by hooking the bearing puller on the inner ring, being careful not to damage the cage.
The tip of the bearing puller has a sharp blade to pinch the inner ring of the bearing. Use this blade to pinch the outer ring. The key to removal is to select the tip of the puller according to the size of the bearing. It is also effective to use a combination of a hydraulic press and a bearing puller to remove the bearing from the shaft.
Precautions for use
The first precaution in using a bearing puller is, as a precondition, to select a puller that can pull out the bearing in an optimal condition. In addition, too much force applied to pull out the bearing may damage the bearing and surrounding parts. These points should also be taken into consideration when removing bearings. If it seems difficult to remove the bearing, please refrain from forcible removal, and you can take actions such as asking a maintenance professional.