Before a bearing is sent out for service, it first must be removed from its shaft housing. It is important to use great care during the removal process to ensure that the bearing, shaft and housing are not damaged.
Bearing removal is best accomplished by using a bearing puller for standard outer and inner rings, which is available through many manufacturers, including Timken. When removing bearings that have a backing shoulder that extends beyond the cone large rib, a puller that pulls through the rollers should be used. Hydraulic pressure is another available method to remove bearings. Pullers or wedges may be used to remove the bearing after the hydraulic pressure has expanded the race. Hot oil or heat may be used along with the pullers or wedges.
When the puller has been placed on the bearing and pressure is applied, the bearing race should expand and be easily removed.
Always use extreme caution when working with hot oil or steam. Contact with hot oil or other heat sources can result in serious bodily harm. Protective clothing and safety glasses should be worn at all times.
There are a number of valid methods you may use to remove a bearing from its shaft. No matter which method is used, be careful not to expose any surface of the bearing to the flame of a torch. Any torch-heat damage renders the bearing as scrap. A bearing’s hardness and metallurgical structure is dramatically altered by torch heat. When it is necessary to drive out inner or outer rings, extreme care should be taken to prevent bearing seat damage, backing shoulder damage or burrs on any surface. Damage to these surfaces will prevent proper seating of the bearing and its new components when reassembled in the application.
Failure to observe the following warnings could lead to a risk of serious bodily harm:
- Proper maintenance and handling practices are critical. Follow the equipment manufacturer’s installation instructions. Failure to follow installation instructions and to maintain proper lubrication can result in equipment failure.
- Never spin a bearing with compressed air. The components may be forcefully expelled.