• A Leader in Wind Energy Support

Introducing the Leak-Free Wind Seal

System Seals has also developed a new seal that virtually eliminates leaks – even after the seal becomes worn. Like run-flat tires on a premium car, this self-correcting feature ensures continuous protection to the main bearing, while preventing leaks, fires and contamination.

All told, the improvements reduce maintenance, downtime and the cost of ownership by approximately 50 percent – no matter where in the world a turbine is located. This new technology is used in OEM equipment, MRO, seal upgrades and repower projects.

With a specialty in large-diameter, custom seals, System Seals quickly became a natural fit for the wind industry several years ago during the surge of new turbines. Today, the company produces the industry’s top performing bearing and pitch seals in sizes up to 3,000 millimeters in diameter.

Systems Seals’ engineers have a unique ability to custom design seals in PTFE compound and polyurethane that substantially outperform standard parts. They offer lower friction, greater reliability and are more resistant to extrusion.

The time and cost involved in replacing turbine seals are far too valuable to rely on standard parts. Talk to a System Seals engineer today to learn how seals designed specifically for each application can be developed and delivered more quickly than most off-the-shelf solutions.

System Seals is Focused on Turbine Seals.

We are organized for wind:

  • Registered supplier to global wind OEMs
  • ISO 9001 certified with standards that exceed ISO
  • Low volume, high-quality production process
  • Global supply chain support
  • 24/7 emergency service from engineers, logistics and manufacturing
  • Long-term customer partnerships
  • Committed to continuous improvement and capital investment

Our wind seals include:


A revolutionary design that redefines rotary seals.

System Seals has created a corkscrew-style seal that uses the turning action of a rotary shaft to pump escaping grease back inside the bearing where it belongs. During deflections, when grease naturally migrates towards the seal, the Vortex pumps it back inside.

The Vortex was a stroke of genius that caused a global wind turbine manufacturer to retrofit all of its labyrinth seals with the new design. System Seals spent more than a year refining the design and testing prototypes, installation methods and tooling – both in the lab and in the field. System Seals also provided initial installation training and ongoing evaluations to monitor performance.

The design has revolutionized the way turbine manufactures view main bearings.


Wear Sleeves for Significant Cost Savings

System Seals wear sleeves are installed onto the shaft to provide a hardened smooth surface, allowing a seal lip to run more effectively. The sleeves eliminate the costly need of grinding and hardening shaft surfaces to accept traditional lip seals.

Wear sleeves maximize seal life and significantly enhance performance. They are typically used in conjunction with the System Seals 440, 442 or 443 series seals. They form a critical part of the complete sealing system.

Product Benefits:

  • High wear resistance for use with 440/442/443 Series lip seals
  • Ground surface finish maximizes seal performance
  • Non-oriented surface finish eliminates fluid pumping effects
  • Manufactured to precise tolerances
  • Precise design tolerances allow pre-heating the sleeve for exact fit installation
  • Tested extensively in aggressive mining and wind turbine main bearings
  • Reduces OEM costs compared to grinding and hardening the shaft sealing surface


  • Wheel-motor, gearbox-shaft seals for mining
  • Main bearings in wind turbines
  • Large-diameter gearbox shafts
  • Features
  • Ground surface finish of 15-20 RMS
  • Hardness value of 48-51HRc
  • Precision high-strength welding to achieve required diameter
  • Easy installation
  • Readily available in large diameters
  • Available in a variety of thicknesses and widths to accommodate any application

  • Rotary Seal
    The 440 Series Rotary Seal is a popular seal used in moderate- to high-speed applications that require maximum reliability and long service life.

  • Rotary Seal with Encapsulated Spring
    The 439 series rotary seal is a popular seal used in moderate- to high-speed applications that require maximum reliability and long service life.

  • High-Speed Rotary Seal
    The 442 Series High Speed Rotary Seal is a premium seal that is highly flexible with dual-construction internal metal spring and seal lip.

Learn More

With a specialty in large-diameter, customized seals, System Seals is the go-to company for the wind industry. System Seals produces the industry’s top performing bearing and pitch seals in sizes up to 3000 millimeters in diameter.

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Contact our Wind Energy specialist

David Hartwell

With more than 25 years of experience implementing advanced technologies, David Hartwell spent his career working with major organizations developing customer-centric solutions aimed at providing economic value.

TEL 330.350.1240
EML davidhartwell@systemseals.com