A customer was experiencing repeated bearing failure every 2-3 months, on the blade support of a concrete pipe slotting machine, with 8 hours downtime per failure. NSK Engineers examined the application and determined that ingress of concrete dust was causing premature failure of the bearings. NSK recommended changing to Molded-Oil bearings, which would give a better service life. This resulted in much improved performance with bearing life quadrupled from 2-3 months to 12 months.

Key Facts

  • Concrete pipe slotting
  • Bearing replacement every 2-3 months with 8 hours breakdown per failure
  • Concrete dust environment
  • NSK solution: Molded-Oil bearings
  • Significant reduction in downtime and maintenance costs
  • Quadrupled bearing life from 2-3 months to 12 months
  • Concrete pipe
  • Molded-Oil

Value Proposals

  • The customer was experiencing poor performance of the bearing on a blade support for a concrete pipe slotting machine.
  • A failed bearing analysis concluded that ingress of cement dust contaminating the grease was the route cause of premature bearing failure.
  • An application review showed that the existing shielded Deep Groove Ball Bearings were inadequate.
  • NSK recommended Molded-Oil bearings with a DDU seal.
  • A trial was conducted and the results showed no failures in a 12 months period.
  • This resulted in a significant reduction in maintenance costs, improved productivity and zero lost production providing a large cost saving for the customer.

Product Features

  • Molded-Oil provides continuous supply of lubrication oil
  • Stainless steel for corrosive environments
  • Grease-free property with no oil refilling keeps operating environments clean
  • Operating life more than twice as long as grease lubrication, in water or dust contaminated environments
  • Contact-seal type available in standard inventory for ball bearings
  • Achieves extended maintenance-free performance as Molded-Oil provides a continuous supply of lubricant
  • Available for high speed applications
  • Available in ball bearing, spherical roller bearing and tapered roller bearings types

Cost Saving Breakdown

Before Cost p.a. NSK Solution Cost p.a.
4 failures per year No failures over one year
8 hours downtime per failure
€1.200 per hour downtime costs
€ 38.400 NSK Molded-Oil bearings operated without failure for 12 months € 0
Total Costs € 38.400 € 0



NSK uses third-party services that help us to improve our web site and show you more interesting content. In order to use these services, we need your consent. This can be revoked at any time. More information can be found here Link to privacy policy.