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Removing Bearings from Equipment

Introduction

Each type of bearing design has a unique removal process. Regardless of the bearing type, the bearing must be removed with extreme care. If done incorrectly, you can damage the bearings, shafts or housings, requiring expensive repairs.

 

Removing Small Bearings

For smaller bearings, there are a variety of pullers available to assist with bearing removal (Fig. 1). Information concerning special pullers or other removal devices can be obtained by contacting your Timken representative.

 

bearing-pullers.png

 

fig . 1 . pullers for bearing removal .

For bearings installed with a tight or press fit, or that have become locked in place on a shaft and cannot be removed with a mechanical puller, the inner ring of the bearing can be heated to ease removal. Heat lamps or other heating devices can be used. If a torch is used, it will change the properties of the bearing steel and the bearing must be discarded.

 

 

 

 

WARNING Failure to observe the following warnings could create a risk of serious bodily harm.

Tensile stresses can be very high in tightly fitted bearing components. Attempting to remove such components by cutting the cone (inner race) may result in a sudden shattering of the component causing fragments of metal to be forcefully expelled. Always use properly guarded presses or bearing pullers to remove bearings from shafts, and always use suitable personal protective equipment, including safety glasses.

Lifting large bearings

Large bearings can be lifted and moved using a variety of slings, hooks, chains and mechanical devices. Some large bearings are manufactured with tapped holes in the face of inner rings or outer rings. eyebolts or other points of attachment can be inserted in these lifting holes (Fig. 2).

Many large bearings have threaded lifting holes in the cage ring that can be used to lift the inner ring assembly.

 

bearing-eyebolts-in-lifting-holes.png

fig . 2 . eyebolts can be inserted into lifting holes .

 

CAUTION Failure to observe the following cautions could create a risk of injury.

If the bearing is to be reused or returned for repair, do not use heat from a torch.

extreme heat from a torch can alter the bearing hardness and metallurgical structure, resulting in irreparable damage. 

A clean, heavy duty nylon sling provides one of the best means of handling large bearing components because it eliminates the possibility of burring or scratching.

Regardless of what method is used to lift the bearings, use care to avoid damaging any of the bearing surfaces. Be especially cautious when lifting or moving bearings that are equipped with a cage. The cage is typically the most deformable component of the bearing and is more susceptible to damage. 

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