Bearing dismounting |
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Reduce the risk of damaging components and personal injury |
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When dismounting bearings, care must be taken not to damage other machine
components, such as the shaft or housing, as damage can result in
compromising the machine's efficiency and lifetime. Bearings are sometimes
dismounted to maintain or replace other components of the machine. These
bearings are often re-used. Selecting the correct dismounting methods and
tools is then essential in reducing the risk of damaging the bearing,
allowing it to be used again. Dismounting bearings can be a hazardous and
demanding task. Selecting the correct dismounting methods and tools is
therefore of utmost importance for reducing the risk of personal injuries.
Individual applications may require mechanical, heat or hydraulic
dismounting methods and tools to allow safe, correct and efficient bearing
dismounting.
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Mechanical dismounting |
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Choosing the right puller for the job is critical. Not only the puller
type, but also its maximum withdrawal capacity is crucial for completing
any dismounting job safely and easily. Puller overload can result in
breakage of the puller's arms and/or beam and therefore should be avoided.
This breakage can damage the bearing or shaft and can cause personal
injury. In general, it is recommended to use a three-arm puller rather
than a two-arm one as the three-arm puller is more stable. Whenever
possible, apply the withdrawal force to the ring with the interference
fit. SKF offers a complete range of easy-to-use mechanical, hydraulic and
hydraulically assisted bearing pullers for use in many bearing
applications. |
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Dismounting using heat |
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The inner rings of cylindrical roller bearings generally have a tight
interference fit, which requires high forces to dismount. In such cases,
using a puller can cause damage to the shaft and ring, and can be
hazardous to the operator. Using heating equipment facilitates easy and
quick dismounting while reducing the risk of damage to the ring and shaft.
SKF offers a range of heating equipment, which includes aluminium heating
rings as well as adjustable and fixed induction heaters, for dismounting
cylindrical roller bearing inner rings.
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Dismounting bearings using hydraulic techniques |
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The SKF hydraulic techniques are often the preferred method for
dismounting larger bearings as well as other components. These techniques,
which employ hydraulic pumps, nuts and oil injectors, allow the
application of substantial forces to dismount bearings or other
components. |
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Safety |
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For optimum safety when dismounting bearings: |
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Always wear protective clothing and goggles when dismounting bearings |
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When dismounting bearings using pullers, make sure to select a suitable
puller for the application with sufficient pulling force in order to
reduce the risk of puller overload. Overloading a puller can result in
puller arm or spindle breakage, causing injury to the operator |
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A safety blanket fitted around the puller and bearing helps reduce the
risk of injury in case the bearing, puller's arm or spindle break |
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Always use heat resistant gloves when dismounting bearings using heat |
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For your own safety, do not strike the bearing directly with any hard
object such as a hammer or chisel |
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Apply dismounting force to part of bearing that has highest fit |
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