A customer was experiencing regular wheel bearing failure and loss of grease from the bearings in an automated crane application, within a product distribution centre. The customer had to change 40 wheel hub units over a 5 year period. NSK carried out a bearing failure analysis confirming that the wheel bearings were suffering from lubrication starvation and radial pre load. To overcome this, NSK recommended the use of pre-greased NSK Sealed Double Row Angular Contact Bearings with an increased radial internal clearance of C3. A trial of 8 wheels, using the modified crane wheel assemblies with NSK bearings, was carried out with no bearing failures reported over 12 months. The solution increased productivity and reduced maintenance costs resulting in a significant cost saving.
|Before||Cost p.a.||NSK Solution||Cost p.a.|
|OEM parts replacing 40 wheel hubs over 5 years||€26.880||Replacement of 8 crane wheel hubs over 5 years||€6.000|
|Loss of production: Cost incurred when crane fails||€30.000||Loss in production: no failures
|Labour costs: Maintenance time||€10.000||Labour costs: Maintenance time||€2.000|
|NSK Engineering consultancy||€4.000||Wheel hub modification, NSK bearings & Cost of machining||€4.704|
|Total Costs||€ 70 880||€ 12 704|