One of the most important requirements for mounting GMN non-contact seals of any type is to assure wobble free running of the inner ring. This may be achieved by pressing the inner ring against a shoulder whenever possible due to the design of the shaft. High accuracy is required for shaft and shoulder.
The following methods of mounting may be used for labyrinth seals and gap seals as well:
If the GMN seal can be mounted from the face we suggest using a mounting bushing covering the seals inner ring and outer ring at the same time to push the seal in place.
As both rings are almost of the same width you will reach the perfect working position that way. With the labyrinth seals the outer ring might be wider than the inner ring up to a maximum of 0.1 mm, which usually doesn't matter too much.
For units of extreme accuracy or if the axial clearance would be of high importance we recommend a recess at the mounting bushing in the area of the aluminium outer ring for optimum positioning of the seal.
In the case that face mounting is not possible due to the design or functional requirement we recommend another way of mounting.
1. The GMN seal should be fitted to the shaft.
2. The shaft can be pushed slowly into the housing. In this case the housing flange will be kept in position by a split distance ring of the width Sa/2.
3. After removing the distance ring the flange will be fitted to the housing. This way the seals outer ring is carried into the right working position by the press fit of the outer ring to the flange.
Special solution against high splashing liquids > GMN Tandem Labyrinth Seal