Installing CF Seals

There are multiple methods and designs to utilize the benefits of a GMN non-contact labyrinth seal. However, the number one aspect to remember is that after installation the seal’s inner and outer races must be axially aligned. This will ensure that one gets the highest sealing efficiency possible from their seal.

Pre-Loading CF Bearings

A large advantage of the GMN CF seal is the ability to carry the pre-load to the bearing. This can be done multiple ways; a common way would be to place the shaft bearing pre-load nut out bound of the seal itself. This can be successfully achieved in any of the below installation methods. Please contact us if you have any questions or concerns about your specific application and/or installation. There are GMN Engineers on staff in Houston TX to support your efforts.

Face Mounted Bearings

The most common installation method would be a Face Mount. This method will leave the labyrinth seal at the end of a unit (i.e. spindle). This method is fairly simple and requires minimal extra design or parts. As in other methods though, an installation tool (tube) is very highly suggested to ensure that the races of the seal are axially aligned after installation. The image shows a simplified example for this installation method. The CF seal is standard in ground steel for the 60 and 619 series seals. This is the reason this picture is shown in this way carrying the bearing pre-load through the steel seal.

Shielding Bearings

For any number of the applications where the seal is floating off of the bearings itself, an aluminum CF seal could do the job nicely. For this reason the simplified picture is showing a standard aluminum 6200 CF seal that is spaced away from the bearing. This installation strategy can be adjusted for many types of labyrinth seal applications.

Another installation method would be to encase the labyrinth seal with a protective shield. This ‘shield’ can come from a mounting piece on the shaft or the housing; both are common. The inner race or outer race pre-loading of the bearings may also determine where the shield is located. The benefits of this is to reduce or eliminate any direct splashing onto the labyrinth seal. In doing so, the shield will also reduce any machining chips from entering and damaging the seal. If possible, the addition of a shield of this type is a low cost method to support the sealing efforts and even greater overall lifetime cost of ownership of the unit.

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