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Main > Techinal > Seal installation

Before installation

  • Do not use any sharp-edged tools to tear up the seal package
    You may inadvertently damage the sealing lip.

  • Perform a simple visual inspection of the seal.
    Check the sealing lip, the tension spring (if any) and the dust lip in particular.
  • Make sure that the elastomer is right for the application
    No two elastomers can perform identically. Please click to find the right material for you.

  • In rotary shaft applications look for any pressure difference between the two media
    The maximum pressure difference a standard rotary shaft seal can withstand is about 0.5 bars and it decreases by increasing rotational speed (> 1000 rpm).

  • Make sure the housing dimensions confirm industry standards
    Please click to see Suptex® product tolerances.

  • Check leading edges on the shaft and the housing. Avoid any sharp edges
    Sharp edges may severely damage the sealing lip.

  • Make sure that the entire contact surface for the seal is clean and free of surface imperfection
    Not just the counterface but any surface area that the seal may come in contact with during installation should be clean, smooth and free of any scratches or bruises.

  • Lubricate the sealing lip and/or the shaft/rod before installation
    This would reduce the friction between the sealing lip and the shaft, thus lowering the risk of damage.

  • Wait until both the seal and the shaft/rod are at close temperatures before installation.
    Elastomeric materials are relatively sensitive to changes in temperature, so are the product dimensions. The narrower the temperature gap between the seal and the counterface the greater the chances would be to assure a perfect assessment of the dimensional fit beforehand.


    During installation

  • Pay attention not to damage the housing or the shaft/rod when removing the used seal
    Do not use any tool that may be hard enough to damage the shaft/rod or housing.

  • Verify the installation direction. Except few rare cases the groove of the seal should always face the oil or the pressured medium.
    Not-too-few cases of customer misuse are simply caused by incorrect installation of the seal.

  • Make sure that the deviation from coaxiality and runout stays very low
    Substantial deviation from coaxiality and/or runout severely lowers the sealing performance

  • Use an assembly sleeve to cover splines and keyways if any
    This way you can avoid any harmful contact between the sealing lip and sharp edges.

  • Use the correct installation tool. Apply the force along the housing axis
    This would prevent the seal from getting stuck in the housing and protect it from any potential damage.

  • Try to apply the force at a constant low pace
    This would prevent the seal from getting stuck in the housing and protect it from any potential damage.

  • Do not ever directly hammer on a rotary seal
    Forceful blows can both damage the seal surface and deform the metal reinforcement, rendering the whole seal useless.

  • Do not try to shorten the spring of a rotary seal by yourself
    Never resort to adjusting the spring length manually to enhance the tension of the sealing lip. Over-tension will not enhance the sealing performance; in contrary it would negatively increase friction, seal temperature and abrasion, thus reducing the useful life of the seal.

  • Never reuse a seal
    Compared to the cost of systems they are part of seals are relatively inexpensive products. Shutting off, taking down and maintaining a system and reassembling it on the other hand is a very expensive process. Do not take an unnecessary risk to save a few pennies.

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